EP2411593A1

EP2411593A1 - Method for producing a functional layer of a building shell, and building shell and functional layer

Info

Publication number: EP2411593A1
Application number: EP10712708A
Authority: EP
Inventors: Jörn SCHRÖER; Jochen Lipps; Georg Meyer
Original assignee: Ewald Doerken AG
Current assignee: Ewald Doerken AG
Priority date: 2009-03-28
Filing date: 2010-03-25
Publication date: 2012-02-01
Anticipated expiration: 2030-03-25
Also published as: US20130333315A1; US8763338B2; EP2612973B1; EP2612973A1; EA201101314A1; US20120055110A1; EP2411593B1; DK2411593T3; HUE027496T2; EA022536B1; US8733054B2; PL2612973T3; WO2010112169A1; PL2411593T3

Abstract

The invention relates to a method for producing a functional layer of a building shell (2), wherein the building shell (2) has a shuttering (11) on the inside of the building and a majority of rafters (12) having rafter fields (14) provided between the rafters (12) and the shuttering (11). According to the present invention, it is provided that the functional layer is applied to the external side (15) of the shuttering (11) at least in some regions by way of painting and/or spraying, and after being applied thereto said functional layer forms an air and/or watertight foil (10), which is in particular designed as a vapor barrier.

Description

Method for producing a functional layer of a building envelope and building envelope and functional layer

The invention relates to a method for producing a functional layer of a building envelope. Furthermore, the present invention relates to a functional casing produced in particular according to the aforementioned method and to a functional layer produced in particular according to the abovementioned method.

Nowadays roofs and facades, ie the building envelope, are subject to high demands due to internal and external influencing factors. External influencing factors are water in liquid form (rain, snow, condensation water, etc.), but also dust, dirt and insects, which are driven or penetrated by cracks and joints of the covering material. As a result, the underlying layers can be unduly moistened, polluted and / or damaged. Internal influencing factors z. As are water vapor convection or diffusion, which can lead to unacceptably high tau or Kondenswas- serbildung.

In order to protect the overall construction from the aforementioned influencing factors, building composite foils are nowadays laid. As a rule, under-, lower- and façade membranes are used to protect against the external influencing factors, to protect against the internal factors of air and vapor barriers / brakes. Depending on the climatic conditions in this case, the reverse arrangement may be useful. Depending on the material used in the composite construction films different properties are required, for. Water permeability and water vapor permeability (sd value), depending on the requirements, between vapor-permeable (sd value between 0 and 0.5 m), moisture-variable, vapor-damping (sd value between 0.5 and 1500 m) and vapor-blocking pathways ( sd value> 1500 m) (DIN 4108).

Roofs differ in shape, inclination, design and stress by z. B. use, construction, climatic conditions and building physics mechanical stress. While undisturbed areas can be covered relatively easily, there are detail points, eg. B. eaves, throats, rising components and connections, as well as penetrations z. As fans, cables, etc., where time-consuming and material-consuming connections must be made. Also, when laying a composite construction film injury to the functional layer by mechanical, chemical and physical stresses occur. Overall, it is therefore difficult to produce the required waterproofness and airtightness of the composite construction film.

So far, connections, detail points and injuries of the functional layer have been performed or repaired by sleeves or adhesive tapes. Disadvantage of this method is that Bauverbundfolien z. B. in geometrically demanding and / or difficult to access details time consuming and difficult with tools such. Nails, staples, adhesive tapes, to be fitted or closed. In addition, adhesive tapes in particular do not adhere to damp or dusty surfaces, which are frequently encountered during renovation.

Special difficulties also arise when laying a functional layer in the area of the rafter fields. This concerns both the initial production of a roof in a new building as well as the roof repair or - renovation. The rafter fields are thereby formed by the open space between the rafters, with building inside, ie towards the building, a formwork is provided. The arrangement of a building composite foil in the spar box and the connection to the formwork is often difficult and time consuming.

Object of the present invention is to provide a method and a building envelope of the type mentioned above, wherein a func tion layer can also be mounted in a rafter field in a simple manner.

A further object of the present invention is to provide a functional layer for a building shell or a method for producing a functional layer, wherein adaptation of the functional layer to certain details of the building envelope is possible in a simple manner and at the same time the necessary tightness of the functional layer is ensured.

The above object is achieved in a method of the type mentioned in the present invention that the functional layer is at least partially applied by brushing or spraying on the outside of the formwork and after application forms an air and / or waterproof, especially designed as a vapor barrier film.

The aforementioned object is achieved according to the invention in a functional layer of a building envelope in that the functional layer at least in some areas has a film applied by spraying and / or brushing, which forms an air- and / or waterproof film after application. In this case, it is preferable to provide at least one composite construction film in addition to the film. In this case, the film is preferably applied in areas in which no composite construction film is provided and / or the composite building film is damaged and / or cut in or cut out.

As a result, a method is provided by the invention, with which it is possible in a simple manner to apply to the outside of a formwork, which forms the bottom or ground of a rafter field, a dense functional layer quickly and without damage, which otherwise build all Complies with requirements. Moreover, the invention thus provides a material or a method, wherein - regardless of the nature of the substrate and the type of geometric requirement - the detail of the building or the building envelope can be quickly and easily equipped with a functional layer, the meets all structural requirements. The film applied by spraying and / or brushing, which is hereinafter referred to as "spray film" for simplicity, but is not limited to spraying but can also be painted, offers the significant advantage of being much faster and lighter can be attached as an inserted into the rafter field composite construction film, if necessary attributed and otherwise to be fixed accordingly. The spray film is preferably applied as an inner or lowermost layer, ie directly or directly, on the outer roof structure. By choosing the appropriate material Spray film can be ensured that it adheres securely to the outside of the formwork, so special fasteners are not necessary.

According to the invention, it is basically possible that the functional layer is completely formed by the spray film. However, this is more a special case, which can occur especially in very crooked roofs, where a laying of Bauverbundfolien is difficult. It is preferred if, in addition to the spray film, the functional layer has at least one composite construction film, wherein the spray film is applied in the areas in which no composite construction film is provided and / or the composite construction film is damaged and / or cut or cut. Finally, it has been found that, for laying-technical reasons, it is particularly suitable if the predominant part of the surface to be provided with a functional layer is provided with a composite construction film, for example an underclad, underdeck or façade membrane and / or an air and vapor absorber - Re / brake, while the respective connection or detail points, which are problematic to connect, are covered by the spray film. In principle, the spray film can have the same properties (eg sd value) as the composite construction film. Of very particular advantage in this context may also be if the spray film has different properties than the composite construction film, as may be the case for example in the field of rafters, which will be discussed in more detail below.

It should be expressly understood that the present invention is not limited to the use of a spray foil in the rafter field. In principle, the invention can also be realized in the area of the façade, if a corresponding stud work is realized there. In this case, the spray film is applied to the outside of the building inside formwork, which limits the stator field between two adjacent uprights toward the building. Below, only the special requirements in the field of rafters or rafter fields and the realization of the spray film will be discussed here. However, the preceding and following versions apply equally to the façade or the studs provided in the area of the façade. The material of the spray film is a plastic containing appropriate additives depending on the application and the properties required for it. As plastic is basically any plastic material in question, which can be applied by brushing or spraying. Preferred here are plastic dispersions which can be dispersed, emulsified or dissolved in an aqueous or organic, preferably aqueous, medium, IK or 2K, polymers, polyamides, polyolefins, polystyrene, prepolymers and crosslinkers, polysulfones, fluorinated polymers, polycarbonates, PVC , Polyacrylonitrile, bitumen / bitumen copolymers, cellulose, latex, butadiene, styrene-butadiene, polyester, polyether, polyurethane, polyurethane resin, in this case preferably acrylates and polyurethanes. The plastic content in the dispersion or in the solution is advantageously between 10 and 90 wt .-%, preferably 20 and 80 wt .-% and particularly preferably between 30 and 70 wt .-%. When using prepolymers, the plastic content is> 70%, preferably> 85% and more preferably> 95%.

In addition, the plastic contains additives. Among the additives contained are in particular rheology modifiers, pH regulators, UV stabilizers, antioxidants, defoamers, plasticizers, adhesion promoters, drying agents, dyes, pigments and flow modifiers to understand. Based on the total amount of the spray film in the dry state, the proportion of additives to 30 wt .-%, preferably 0.5-15% and more preferably 1-7%.

The defoamer additives of the group may in principle be silicone-containing or mineral oil-containing defoamers. Particularly advantageous silicone-containing defoamers have been found.

The proportion of antifoams, based on the total amount of all components, is between 0.1 and 10% by weight, based on the total amount of all components, in particular between 0.2 and 7.5% by weight. Particularly suitable mixtures have been found in which the defoamer has a proportion between 0.3 and 5 wt .-%.

Rheology additives are generally present in an amount of from 0.05 to 5% by weight and in particular from 0.1 to 2.0% by weight, based on the total amount of spray film in the wet state. For a spray application rheology modifiers are preferred, which exert a strong thixotropic or pseudoplastic effect, such that the viscosity of the spray film or the spray film material during the application, ie the action of high shear forces, is low, but the viscosity at low Shearing forces, ie after application, increases in such a way that a drainage of the sprayed layer does not take place.

Whether and which of the other additives, which are not described in more detail above, are incorporated in the spray film depends on the nature of the intended field of use and the amount of the other components contained. In general, the amount of this proportion is between 0 and 5 wt .-%.

Depending on the composition, the spray film can not only be used in the previously mentioned areas of the composite construction film. It is then also suitable for use in the areas of flat roofs, sealing of earth-contacting components and gutters. Furthermore, it can be used for burls and drainage membranes, horticultural films, concrete, plaster, wood, fleece or similar materials for connections or repairs.

The time savings when using a spray film is greater, the more sophisticated and geometrically complex the building detail is built. For example, the time saved when laying on a fillet bar compared with the prior art with a composite tape to be connected via an adhesive tape is approx. 50%; the same savings are achieved with pliers.

The application temperature of the Sprühfolie is between 5 and 50 ⁰ C, preferably between 10 and 40 ⁰ C. The film formation time of the applied material is at most 2 hours, preferably 1 hour, and especially between 5 and 30 minutes.

The applied layer thickness depends on the respective requirements. In normal applications, between 4 and 800 μm are applied during the coating application and between 11 and 1500 μm in the spray application. In both applications, layer thicknesses between 100 are preferred and 300 microns provided. For the sealing of earth-contacting components, higher requirements are necessary. Layer thicknesses of 0.4-3 mm are required in this range, preferably between 0.7-1.5 mm.

To check the adhesion values, the spray film is applied to various substrates and, after 24 hours, a T-peel test in accordance with DIN 4108 is carried out. The adhesive strengths are> 8 N / 5 cm, preferably> 12 N / 5 cm and more preferably> 15 N / 5 cm. When applied to a wet surface, at least 70% of the previously indicated values are reached, preferably up to 85% and sometimes more.

The watertightness is determined according to EN 13859 as a static water column. To check the spray film is applied to a 2 mm wide and 5 cm long crack in a film base material. In this case, water impermeability> 100 mm is achieved, preferably> 200 m, more preferably> 500 mm and in particular> 1000 mm. In the sealing of earth-contacting components higher demands are also given here. There, water impermeability of> 500 mm are required, preferably> 1500 mm.

The water permeability or vapor permeability depends on the application and can be adjusted by the base material and the layer thickness depending on the application as follows:

- Application of the spray film on / as air and / or vapor barrier / brake: sd value according to EN 1931: 0.5-100 m, preferably 2-40 m, more preferably

2-5 m; and or

- Application of the spray film on / as moisture-variable air and / or vapor barrier / brake: sd value according to EN 1931: <2 m in the moist range (relative humidity 90%) and> 2 m in the dry range (relative humidity 40%) ), preferably <1.2 m in the moist range (relative humidity 90%) and> 2.5 m in the dry range (relative humidity 40%); and or

Use of the spray foil on / as a seal on earth-contacting components: sd value according to EN 1931:> 20 m, preferably> 100 m, more preferably

> 200 m; and or - Application of the spray film as vapor-permeable underlayment, underlayment and / or façade membrane: sd value according to EN 1931: 0.01-0.5 m, preferably 0.02-0.3 m.

For the vapor-permeable case, it is also possible to use specifically incompatible defoaming additives which lead to pores caused by microfoam and thus to correspondingly low sd values.

A special case in the application is the loop-shaped laying over the rafters. Generally speaking, a high sd value is required in the area of the rafter field and a low sd value in the area of the rafters themselves, in particular on the rafter tops. This can be achieved, e.g. in that the moisture-variable case is applied to the entire roof. However, preference is given to the variant in which a vapor-damping or steam-blocking film with a high sd value is placed in the rafter field and the spray foil is applied to the rafters. In this case, a smaller sd value of the spray film of <1.7 m, preferably <1 m and more preferably <0.5 m can be used.

Depending on the nature of the substrate and / or the width of the gap to be repaired, it is additionally possible to work with a support structure / layer. This serves to compensate for larger roughnesses and porosities or to bridge gaps. The support structure / layer may be, for example, a nonwoven or fabric. In particular, lightweight nonwovens (10-50 g / m ² ) made of polypropylene or polyester can be used, since these are inexpensive and flexible and provide a good substrate for the coating with the spray film.

Since components of a building are not covered directly but in the course of the construction progress, not inconsiderable exposure times to free weather can occur. UV exposure, heat, cold, wind and rain are the main factors here. This is preferably taken into account by the spray film having sufficient resistance to UV radiation / heat and moisture swelling, being heat-resistant and cold-flexible, as well as adequate breaking forces and Offers elongation at break. The resistance to UV-radiation / heat is at a film Sprühfolien- according to EN 13859 in a combination of artificial weathering (QUV, 14 days) and heat storage (8O ⁰ C, 90 days) determined. Subsequently, waterproofness, breaking forces and elongation at break are determined. At these values 50% of the starting values before weathering and heat storage are achieved in the spray film according to the invention, preferably 80% and more preferably 90%.

The resistance to Feuchtigkeitsquellung has been determined at a erfindungsgemä- SEN Sprühfolienfilm by immersion in water at 50 ⁰ C for 4 weeks. The weight increase is less than 20%, preferably less than 10% and more preferably less than 5%, depending on the material of the spray film. The breaking strength against the un-stored state is> 30%, preferably> 50%. If the test is performed on a support, a replacement can not be observed.

The cold flexibility has been determined on the spray film according to the invention with the respective largest layer thickness as cold bending behavior according to EN 13859. The test has been passed at -5 ° C, preferably at - 15 ° C and more preferably at -30 ⁰ C.

The tensile strength according to EN 13859 of the spray film has been found to be sufficient at a value of> 50 N / 5cm. Preferably, values of> 80 N / 5 cm have been achieved.

The elongation at break according to EN 13859 of the spray film has proven to be suitable at a value of> 50%. Preferably> 100% and further> 200% were achieved.

On the other hand, if the spray film is applied to a support structure, an elongation at break of> 10%, preferably> 20%, is sufficient. The tear strength in this case should preferably be> 100 N / 5 cm.

For the practical suitability of the coating or the spray film in addition to the properties of the cured spray film and the properties in the liquid form are important. In this case, the vis- viscosity, the drying time and the flow behavior of the material of the spray film.

The viscosity for the coating application should be in the range of 5,000 to 25,000 mPa ^· s, preferably between 8,000 and 18,000 mPa ^· s and more preferably between 11,000 and 15,000 mPa ^· s. For the spray application, viscosities of between 500 and 5,000 mPa ^· s are expedient, preferably between 1,000 and 4,000 mPa ^· s and in particular between 1,500 and 3,000 mPa ^· s.

The drying time at 20 ⁰ C and 50% relative humidity is preferably <5 hours to continue working after application of the Sprühfolie is possible in a reasonable period of time. The spray film is then dry to the surface and light. Preferably, the drying time is less than two hours and more preferably <1 hour, with an open time of> 5 minutes, preferably between 6 and 20 minutes, may be useful to allow for corrections.

Drying times of the solvent-free film, ie the aqueous-based spray film, depend very much on the acrylate dispersions used, with the exception of temperature and atmospheric moisture. It has been shown that formulations based on the Revacryl series of Synthomer have the best drying time and film formation properties, as compared to formulations based on comparable acrylate dispersions - e.g. Primal AC 235 (Rohm & Haas) or Mowilith LDM 7739 (Celanese) - gives:

The comparative formulations were lapped next to each other on Kunsstofffieie (200 microns wet layer thickness) and determines the time to stable, ie by applying pressure with a blunt object, no more damaging film formation:

An example recipe for indoor applications (below the thermal insulation), where no minus degrees on the film of the spray in winter, looks like this:

Plastic dispersion Synthomer Revacryl 100, deaerator Tego Airex 902W 2.7%, BTC Helizarin blue 3.3%, filler quartz movements Tremin Wollastonite USST 939-100 10%, filler Dupont Tipure TiO ₂ 3.3%, thickener Borchi Gel 0625 0.1% , Thickener Borchi Gel 0622 0.2%, defoamer Tego Foamex 825 3.3%.

An example recipe outdoor applications (above the thermal insulation), which act in the winter minus degrees on the film of the spray film, looks like this:

Synthetic dispersions Synthomer Revacryl 100: Synthomer Revacryl 5239 1: 2 ratio, Tego 590 LAE defoamer 15%, BTC Helizarin blue 0.25%, quartz works filler Tremin Wollastonite USST 939-100 12.5%, thickener Borchi Gel 0625 0.1%, thickener Borchi Gel 0622 0.2%.

The flow behavior is particularly important in inclined and vertical applications of importance, in principle it should be noted that the present invention can be readily implemented in horizontal, at any angle inclined and vertical applications. Runners, also known as curtains or noses, may experience excessive application of low viscosity materials, especially in applications on a vertical surface. In connection with the present invention it has been found that the flow behavior depends on the one hand on the viscosity of the material to be applied and on the other hand on the layer thickness. Furthermore, the surface tension of the substrate, to which the material of the spray film is applied, plays a role. In principle, the viscosity and the layer thickness as well as the surface tension of the substrate should be selected such that, when applied to a vertical flat surface, a running distance of less than 7 cm, preferably less than 5 cm and in particular <3 cm results.

In an experiment carried out in the context of the present invention, two drops of the liquid film having a viscosity corresponding to the above-mentioned ranges are applied to a film of polyamide 6 having a surface tension of 42 mN / ra. Then the film has been placed vertically. The layer thickness of the drops was in the range of 1.5 mm. The running behavior or the length of the runner was less than 3 cm.

The following are some recipe examples of the material of the spray film according to the invention:

Recipe 1 (spraying)

Plastic dispersion RA 576 H (based on acrylate / methacrylate) from Ercros,

Defoamer Tego Foamex 805 1% from Evonik, Printofix Red 0.5% from Clariant, thickener Borchi Gel 0621 0.5% from OMG Borchers.

Viscosity: 1.75O mPa - S

Layer thickness: 284 g / m ²

Sd value: 1.95 m

Use eg: U-shaped between the rafters or as vapor-damping LDS / repairs Recipe 2 (swipe)

Plastic dispersion Mowilith LDM 7739 (based on acrylate) from Celane, defoamer AF 0871 1% from OMG Borchers, Printofix Yellow 0.5% from Clariant, thickener Borchi Gel 0621 0, 1%, from OMG Borchers, leveling additive Borchi Gel 232 1% of the company OMG Borchers Viscosity: 15.40O mPa - S Layer thickness: 197 g / m ² Sd value: 0.92 m Use eg: U-shaped between the rafters or as vapor-damping LDS / repairers

Formulation 3 (brushing) plastic dispersion Emuldur DS 2360 (based on polyurethane) from BASF,

Defoamer Tego Foamex 805 0.8% from Evonik, thickener Borchi

Gel 0621 0.15% of the company OMG Borchers, leveling additive Borchi Gel 232

1.2% of the company OMG Borchers

Viscosity: 10,300 mPa ^• s Layer thickness 1: 60 g / m ²

Sd value: 1: 0.05 m

Layer thickness 2: 105 g / m ²

Sd value 2: 0.09 m

Use, for example, as a vapor-permeable UDB, for repairs to UDB or on the rafters in combination with U-vapor barrier

Recipe 4 (spraying)

Acrylate dispersion: RA 576 H from Ercros Defoamer: AF 0871 1.25% from OMG Borchers

Color: Printofix Red 0.5% of Clariant

Thickener: Borchi Gel 0621 0.5% of the company OMG Borchers

Viscosity: 1.75O mPa - s

Layer thickness: 284 g / m ² Sd value: 1.95 m

Use, for example: U-shaped between the rafters or as a vapor barrier

LDS / Repairs Recipe 5 (spraying)

Acrylate dispersion: Mowitith LDM 7739 from Celanese Defoamer: AF 0871 1.5% from OMG Borchers Color: Printofix Red 1.0% from Clariant Color: Printofix Yellow 1.0% from Clariant Thickener: Borchi Gel 0621 0.1 % of the company OMG Borchers Leveling additive: Tego Wet 270 1% of Evonik Viscosity: 2,550 mPa ^• s Layer thickness: 205 g / m2 Sd value: 2.3 m

Use for example: U-shaped between the rafters or as vapor-damping LDS / repairs

Recipe 6 (spraying)

Plastic dispersion Emuldur DS 2361 (based on polyurethane) from BASF,

Defoamer Tego Foamex 805 1.2% from Evonik, thickener Borchi

Gel 0621 0.08% of the company OMG Borchers, flow-additive Borchi Gel 232 0.9% of the company OMG Borchers

Viscosity: 1.36O mPa - s

Layer thickness: 66 g / m ²

Sd value: 0.19 m

Use, for example: as a vapor-permeable UDB, for repairs to UDB, on the rafters in combination with U-vapor barrier, sealing of panel joints

Recipe 7 (swipe)

Acrylate dispersion: Synthomer 100 from Synthomer Defoamer: Tego 815 N 4% from Evonik

Color: Printofix Black 1.0% of the company Clariant

Thickener: DSX 3800 0.2% from Cognis

Viscosity: 11,700 mPa ^• s

Layer thickness: 123 g / m2 Sd value: 1.4 m

Use, for example: U-shaped between the rafters or as a vapor barrier

LD S / repairs The differences between the recipes for the spreadable and sprayable variants essentially relate to the proportion of the rheology additive to the total amount of the spray film in the wet state. For the sprayable variant higher proportions are necessary because of the higher applied layer thickness and the resulting greater tendency to runners. Based on the example given, the proportion of the rheology additive increases by about 50% based on the initial addition of the additive for the coating film.

The application of the film according to the invention can be carried out by spray application by airless devices, Airmix devices or spray cans. In the case of airless application through a pressure spray bottle, commercially available nozzles (hollow cone, full cone, flat jet, etc.) can generally be used. Due to the high viscosity of the material of the spray film, however, a special nozzle is preferably used. With Airmix application, the spray foil is filled into the paint cup of the spray gun and applied with compressed air. The spray cans preferably contain about 50% dimethyl ether as blowing agent and about 50% spray film material. In the spray application method, the distance to the surface to be sprayed is about 30 cm.

According to the invention, it is basically possible that the functional layer is completely formed by the spray film. However, it is also possible for at least one air-tight and / or watertight film strip, in particular a vapor barrier, to be applied along the rafter field, with the longitudinal edges of the film strip and the previously or later applied spray film then overlapping. It is preferred in this case if first spray film strips are applied to the formwork, while the central region remains free for the film strip. Subsequently, the film strip is then applied overlapping on the applied spray film, so that then results in a secure bonding of the film strip on the spray film on the formwork.

In a particularly preferred embodiment of the present invention, the spray film is applied to at least one, in particular both rafter sides of the rafters of a rafter compartment at least to a partial height. In this case, results in a U-shape (relative to the cross section) of Functional layer. In this case, the spray film is applied so that ultimately results in a closed surface of the spray film and thus airtightness in the spray film. This not only affects the rafter sides and the outside of the formwork, but also, in particular, the transition between the formwork and the rafters.

In connection with the present invention it has been found that it is favorable that the spray film is applied from the formwork over a rafter height between 10 to 90%, preferably 20 to 80% and in particular of more than 30% on the rafter side. The sd value of the spray film and / or the film strip at a relative humidity of 40% should be more than 0.5 m, preferably more than 0.8 m, more preferably more than 1.3 m and in particular more than 1.9 m amount.

In order to allow unhindered drying out of the wood of the rafters to the outside, the vapor-damping spray film, which is applied as a functional layer on the formwork, should not be provided on the rafter tops. The top surfaces of the rafters can either remain free or it can be applied at least in some areas to a diffusion-open further film strip and / or a further vapor-permeable spray film (ie by spraying or brushing). In this case, the sd value of the further film strip or of the further film should be less than 0.5 m, preferably less than 0.3 m and in particular less than 0.09 m.

Although a connection between the further film strip provided on the rafter top side and the further film with the lower spray film is not absolutely necessary, an overcoating in this area, ie an overlay in the edge region with a few centimeters, is nevertheless preferred better ensure airtightness.

After application of the lower spray film, if appropriate in conjunction with a film strip, as well as the further spray film or the further film strips provided on the rafter tops, the building shell is preferably further constructed by appropriate materials. Thus, on the film first of all a thermal insulation material can be placed, which then in the rafter box is introduced. This can be followed by another formwork, another thermal barrier coating or a vapor-permeable underlay membrane. It is also possible to provide a further vapor-permeable film applied by spraying or brushing or another diffusion-open separating layer.

On the aforementioned layers, which may be provided in themselves but in any combination with each other, then a counter battens and / or a battens may be applied as needed. The outside forms a hard outer cover. This can be a tile roof or a metal roof.

Moreover, it is understood that appropriate layers and materials may be provided in the area of the facade, if desired and necessary.

Furthermore, the present invention, as mentioned above, also relates to a building shell, in which the aforementioned features according to the method are then realized correspondingly constructive.

In the following, features are indicated which describe, by themselves or in any combination with one another and / or with the features indicated in the patent claims, possible embodiments of the method according to the invention of the functional layer according to the invention and / or of the building envelope according to the invention and are therefore also essential to the invention. Thus, the method, the building envelope and / or the functional layer or the spray film can be additionally characterized by

that the viscosity of the material of the film for a coating application in the range between 5,000 to 25,000 mPa ^· s, preferably between 8,000 and 18,000 mPa ^· s and more preferably between 11,000 and 15,000 mPa ^· s, and / or that the viscosity for a spray application 500-5000 mPa ^• s, preferably approximately 1,000 to 4,000 mPa ^■ s and further preferably from 1,500 to 3000 mPa ^• s and / or - That the drying time at 20 ⁰ C and 50% relative humidity is less than 5 hours, preferably less than 2 hours, more preferably less than 1 hour, and / or that the open time of the material of the film after application is greater than 5 minutes, especially between 6 and 20 minutes and / or

- That the running distance of the applied to a vertical surface material of the film depending on the surface tension of the substrate, the viscosity and the thickness of the applied material is less than 10 cm, preferably less than 5 cm and more preferably less than 3 cm and / or

- That the layer thickness of the film in non-touched applications in the coating application between 4 and 800 microns and in the spray application between 11 and 1500 microns, preferably between 100 and 300 microns and / or

that the adhesive strength of the film is greater than 8 N / 5 cm, preferably greater than 12 N / 5 cm and in particular greater than 15 N / 5 cm after 24 h in the case of a T-peel test according to DIN 4108 on dry underpressure and that Preferably, when applied to a wet surface, the adhesive strength is at least 70%, preferably about 85% of the adhesive strength on a dry surface and / or

that the film has the following water vapor permeability in subsequent applications:

- Application as a vapor barrier: sd value according to EN 1931: 0.5 to 100 m, preferably 2 to 40 m and in particular 2 to 5 m; and or

- Application as a moisture-variable vapor barrier: sd value according to EN

1931: less than 2 m in the humid area (relative humidity 90%) and larger than 2 m in the dry area (relative humidity 40%), preferably less than 1.2 m in the humid area (relative humidity 90%) and greater than 2.5 m in the dry area (relative humidity 40%); and or - Application as a seal in contact with the earth: sd value according to EN 1931: greater than 20 m, preferably greater than 100 m and in particular greater than 200 m; and or

- Application as vapor-permeable layer: sd value according to EN 1931:

0.01 to 0.5 m, preferably 0.02 to 0.3 m.

- That as a material of the film a single- or multi-component plastic is provided, in particular in the form of a plastic dispersion which is dispersible, emulsifiable or dissolvable in an aqueous or organic medium and / or

that the plastic is selected from polyamides, polyolefins, polystyrenes, prepolymers and crosslinkers, polysulfones, fluorinated polymers, polycarbonates, PVC, polyacrylonitrile, bitumen / bitumen

Copolymers, cellulose, latex, butadiene, styrene-butane, polyester, polyether, polyurethane, acrylates, each alone or in any combination with each other and / or

- That the plastic content in the dispersion, emulsion or in the solution between 10 wt .-% and 90 wt .-%, preferably between 80 wt .-% and 100 wt .-% and in particular between 30 wt .-% and 70 wt .-% is and / or

- That when using prepolymers, the plastic content is greater than 70%, preferably greater than 85% and more preferably greater than 95% and / or

- That the plastic contains additives and that are provided as additives rheology modifiers, pH regulators, UV stabilizers, antioxidants, defoamers, plasticizers, adhesion promoters, drying agents, dyes, pigments and / or flow modifiers and / or

- That the proportion of the additives based on the total amount of the material of the film in the dry state is up to 30 wt .-%, preferably between 0.5 to 15% and in particular between 1 to 7% and / or

- That are provided as antifoam additives silicone-containing and / or mineral oil defoamers and / or

that the proportion of defoamers based on the total amount of all components between 0.1 wt .-% to 10 wt .-%, in particular between 0.2 wt .-% and 7.5 wt .-% and particularly preferably between 0, 3 wt .-% and 5 wt .-% is and / or

- That the rheology modifiers in an amount of 0.05 wt .-% to 5 wt.% And in particular 0, 1 wt .-% to 2 wt .-% based on the total amount of the film in the wet state are included and / or

that rheology modifiers are provided which exert a strong tixoprophene or pseudoplastic effect in such a way that the viscosity of the film during application is low, but the viscosity after application increases in such a way that the applied film does not flow off and / or or

- That the application temperature of the film is between 5 ° C and 50 ⁰ C, preferably between 10 ⁰ C and 40 ⁰ C and / or

- That the skin formation time of the film is a maximum of two hours, preferably one hour and especially between 5 minutes and 30 minutes and / or

- That the layer thickness of the film in not touched applications in the coating application between 4 and 800 microns and in the spray application between 11 and 1500 microns, preferably between 100 and 300 microns and / or

- That the layer thickness of the film in Erddberührt applications between 0.4 to 3 mm, preferably between 0.7 and 1.5 mm and / or that the adhesive strength of the film is greater than 8 N / 5 cm, preferably greater than 12 N / 5 cm and in particular greater than 15 N / 5 cm after 24 h in a T-peel test according to DIN 4108 on dry underpressure and that, preferably, when applied to a wet surface, the adhesive strength corresponds to at least 70%, preferably 85% of the adhesive strength on a dry surface and / or

- That the water resistance (determined according to EN 13859 as a static water column) is greater than 100 mm, preferably greater than 200 mm, more preferably greater than 500 mm and in particular greater than 1000 mm when not in contact with the application and / or

- that the waterproofness (as determined by EN 13859 as a static water column) in exposed applications is greater than 500 mm, and in particular greater than 1500 mm, and / or

in the case of vapor-permeable applications, the film has incompatible defoaming additives which lead to micro-foam-induced pores and low sd values and / or

- That the functional layer in the region of the film has a support structure for bridging and / or

- That the support structure is formed as a woven or non-woven, in particular of polypropylene or polyester and / or

- That the resistance of the film according to (EN 13859) after artificial weathering (QUV, 14 days) and heat storage (80 ⁰ C, 90 days) is such that at least 50%, preferably more than 80% and in particular more than 90 % of the initial values before weathering and heat storage is achieved and / or

- That the weight increase of the film when stored in water at 50 ⁰ C for four weeks is less than 20%, preferably less than 10% and in particular less than 5% and / or - That the test of the cold bending behavior of the film according to EN 13895 at - 5 ° C, preferably at 15 ° C and in particular at -3O ⁰ C is passed and / or

- That the breaking strength of the film according to EN 13859 is greater than 50 N / 5cm, in particular greater than 80 N / 5cm and / or

- That the elongation at break according to EN 13859 of the film is greater than 50%, preferably greater than 100% and in particular greater than 200%, and / or

- That the elongation at break when applying the film to a support structure greater than 10%, preferably greater than 20% and / or the breaking strength when applied to the support structure is greater than 100 N / 5cm and / or

- That the film is intended for use in the roof area, in particular in the area of flat roof, for sealing of earth-contacting components, gutters, bubble and drainage, horticultural, concrete, plaster, wood, nonwoven or the like materials for connections or repairs and /or

- That when using the functional layer in the rafter-containing roof area a vapor-damping building composite foil is provided in the rafter field between the rafters, while on the rafters, the film is provided and that, in particular, the film sd value of less 1.7 m, preferred less than 1 m and in particular less than 0.5 m and / or

- That the spray application of the film by airless devices, Airmix devices or spray cans takes place and / or

- That before application of the film, the composite construction film is prepared during installation so that the composite building film rests flat on the ground and / or - That the composite building film adjacent to the area in which the film is to be applied, folded and fixed with staples or nails on the ground and / or

- That the composite building film cut out in the region of a penetration point for a component of the building envelope and that subsequently applied to the connection area, the component and the composite building film overlapping on the film and / or

- That the subsequent component and the composite building film of the film over a coverage area of less than 10 cm, preferably between 3 and 7 cm, are covered.

It may also be expressly pointed out that the aforementioned range indications and intervals also include all intermediate ranges and intervals lying within the range or interval limits as well as all individual values and that these are to be regarded as essential to the invention, even if these are not mentioned in detail.

Hereinafter, embodiments of the invention will be explained with reference to the drawing. All described and / or illustrated features, alone or in any combination, form the subject matter of the present invention, regardless of their combination in the claims or their dependency.

It shows

1 is a schematic representation of a building with a building envelope,

2 is a view of a rafter field of a building envelope according to the invention,

3 is a view corresponding to FIG. 2 of another embodiment of the present invention, 4 a of FIG. 3 corresponding view of another embodiment of the present invention,

5 is a schematic cross-sectional view of a building shell in the roof area,

6 is a schematic cross-sectional view of a first installation situation,

7 is a schematic view of a second installation situation,

8 is a schematic view of a third laying situation,

9 is a schematic view of a fourth installation situation,

10 is a schematic view of a fifth installation situation,

11 is a schematic view of a sixth installation situation,

12 is a schematic view of a seventh laying situation,

13 is a schematic view of an eighth laying situation,

14 is a side view of the laying situation of FIG. 13,

15 is a schematic view of a ninth installation situation,

16 is a side view of the laying situation of Fig. 15,

17 is a schematic view of a tenth laying situation,

18 is a side view of the laying situation of Fig. 17,

19 is a schematic view of an eleventh laying situation, Fig. 20 is a side view of the laying situation of Fig. 19 and

Fig. 21-24 tables with properties of the spray film according to the invention

In Fig. 1, a building 1 is shown schematically, which has a building envelope 2. In the present case, the building envelope 2 has a facade 3 and a roof 4. The facade 3 is divided into a located above the bottom 5, not touching the earth façade area 6 and in an earth-contacting facade area 7, which is below the surface of the bottom 5, on. In the area of the roof 4 is present a fireplace 8 and an antenna. 9

The building envelope 2 is provided with a functional layer, not shown in FIG. 1, which can be provided fully or partially in the area of the facade 3 and / or the roof 4. It is understood that areas in which doors, windows or even the fireplace 8 or the antenna 9 or other details are excluded from this.

In FIGS. 2 to 4, a part of a roof structure of the building 1 is now shown. The roof structure also belongs to the building envelope 2, which has a building-side formwork 11 and a plurality of rafters 12 in the roof area. The formwork 11 is arranged towards the building interior and is usually connected to the lower sides 13 of different rafters 12. Between adjacent rafters 12 are each rafter fields 14, which are bounded at the bottom of the formwork 11. The formwork 11 may be any component of any material that seals the rafter panels 14 to the building interior. The outside 15 of the formwork 11 has in the present case to the outside, ie away from the building interior.

In all the illustrated embodiments, it is now the case that the functional layer is applied to the outer side 15 of the formwork 11 at least in regions by brushing and / or spraying a film, which is referred to below as a spray film 10. The spray film 10 forms after application, so after application to the outside 15 of the formwork 11, an air and / or waterproof film, which preferably also has the properties of a vapor barrier. FIGS. 2 to 4 show various possibilities of forming the functional layer. In all embodiments, it is such that the functional layer not only extends over the entire width of the rafter field 14, but is also provided on the rafter sides 16. In this case, the functional layer extends over a partial height of the rafter side 16. As can be seen from the two rafter fields 14 shown in FIG. 2, the functional layer, which is completely formed by the spray foil 10 in this embodiment, can only be over a small part or but also extend almost completely over the entire rafter height. The rafter top 17 is uncoated in the embodiment of FIG. 2, so that unimpeded drying out of the wood is possible to the outside.

In the embodiment according to FIG. 3, the functional layer has a film strip 18 placed on the outside 15, wherein a strip of spray film 10 is provided at the edge on both edges. In the left rafter field 14 of FIG. 3, it is the case that initially the right spray foil 10 has been applied. Subsequently, the film strip 18 has been placed, in such a way that the film strip 18 and the spray film 10 overlap. Subsequently, the left spray film 10 has been applied, wherein here also takes place an overlap with the film strip 18. Moreover, it is in the right spray film strip so that this - albeit only partially - on the rafter top 17 protrudes. It is understood that this is not necessarily the case. In the right rafter compartment 14 in the embodiment of FIG. 3, the film strip 18 has first been placed on the outside 15 of the formwork 11. Subsequently, the spray film strip 10 are then applied edge side. Again, there is an overlap of the spray film 10 with the film strip 18.

In the embodiment according to FIG. 4, another spray foil 19 is located on the rafter upper side 17. In the case of the left rafter 12 according to FIG. 4, the spray foil 19 has been applied first. Subsequently, the spray film 10 has been applied. The spray foil 10 and the further spray foil 19 overlap in the transition area. In the case of the central rafter 12 according to FIG. 4, it is the case that initially the spray foil 10 has been applied, except for the rafter top side 17. Subsequently, the further one is Spray film 19 has been applied. This results in an overlap on the left side, while on the right side this is not the case. There is even an uncoated gap.

Instead of the further spray film 19 may be applied to the rafter top 17 and another film strip, which then has the same properties as the other spray 19.

In Fig. 5, a roof structure of a building envelope 2 is shown. In this case, the functional layer is applied to the outer side 15 of the formwork 11 as a spray film 10, which extends to the rafter sides 16. The spray film 10 is accordingly - seen in cross section - U-shaped. On the rafter tops 17 another spray 19 is applied. While the further spray film 19 is open to diffusion, the spray film 10 is a vapor barrier. The spray foil 10 and the further spray foil 9 thus have different sd values. In the rafter fields 14 a thermal insulation material 20 is introduced. On the further spray film 19, a further formwork 21 is applied, which ultimately rests on the rafters 11 and is fixed thereto.

Above the other formwork 21 is a lower cover web 22, which is in this case open to diffusion. Instead of the lower web 22, a further spray film with corresponding properties, in the present case so that it is open to diffusion, can also be provided. Above the underlay membrane 22 there is a counter battens 23 and, in turn, a battens 24. The outer roof skin is in this case formed by a hard covering 25 in the form of a tile roof.

It should be pointed out that FIG. 5 shows a possible embodiment of a roof structure in the case of a building shell 2 according to the invention. For example, it is readily possible to provide above the rafters 11 a Aufsparrernmung or doubling. On the other formwork could be dispensed with in principle. Instead of a hard cover in the form of a tile roof could also be provided a metal roof, moreover.

It should also be pointed out that the embodiments illustrated in FIGS. 2 to 5 can in principle also be realized in the area of the facade in the case of a studwork. The present invention is therefore not on the Roof area limited, but extends in particular to the facade area, which are then provided instead of the rafters stand.

In the embodiments illustrated in FIGS. 6 to 20, it is the case that the functional layer of the building envelope 2, which is at least substantially not external to the building envelope 2 at least in some areas, has a film applied by spraying or brushing air and / or waterproof film is formed. The aforementioned film applied by spraying and / or brushing is hereinafter referred to as spray film 10, without being limited to the application by spraying.

In connection with FIG. 1, it should be pointed out that the spray foil 10 may in principle be provided over the full area in the entire area of the building envelope 1, that is to say on the facade 3 and in the area of the roof 4. In this case, the spray film forms the functional layer. The same applies if the spray film is applied only partially, so not the entire surface. In the embodiments described below, it is the case that the functional layer has a composite construction film 112 in addition to the spray film 10. Under composite film is ultimately understood a film layer that can be composed on one or more tracks. Incidentally, the term "modular composite film" encompasses films for protection against external influencing factors, in particular underlay, underdeck and façade membranes, as well as membranes for protection against internal influencing factors, in particular air and vapor barriers / brakes. If the term "composite construction film" is used below, this may in principle mean any of the aforementioned webs.

In the case of a combination of a spray foil 10 with a composite construction foil 112, it is particularly appropriate to cover large areal regions which are easy to lay over the composite building foil 112, while in areas where the connection of the composite building foil is difficult or impossible for connection reasons Bauverbundfolie damaged or to

The connection of components is cut in or out, the spray film 10 is applied. FIG. 6 shows an installation situation which shows that the composite building film 112 is prepared in such a manner during installation by a detail to be connected in the region of the detail that the composite building film 112 rests flat on the substrate 113. For this purpose, the composite construction film 112 is folded in the area immediately adjacent to the detail or provided with a fold 114 and fastened to the substrate 113 with nails 115 or staples (not shown). After creating a secure flatness of the composite construction film 112, the spray film 10 can then be applied in the detail area to be connected.

In Fig. 7 shows a mounting situation is shown in which a Kehlsparren 116, rafters 117, Kehlschalung 118 and a composite construction film 112 are shown. In the regions 119 at the transition to the fillet formwork 118, stress on the construction composite foil 112 can easily cause injuries to the functional layer. If the functional layer is damaged during installation of the composite building film 112 in the areas 119, these can be quickly repaired by means of a spray film 10 which is applied to this area and forms a securely adhering film. Incidentally, in the illustrated embodiment, it is such that the composite building film 112 meeting each other from both sides of the throat can be easily connected to each other by spray film 10 applied.

FIG. 8 shows an installation situation with a throat bar 120 and a rafter 121. The composite construction film 112 is cut out in the region of the fillet 120, namely around it, so that an opening 122 results. Subsequently, the region of the opening 122 and the adjacent region of the composite construction film 1 12 is provided with spray film 10, so that the closed functional layer 10 results.

FIG. 9 shows an installation situation in connection with an antenna 9. It should be pointed out that instead of the antenna 9, in principle, a pipe or a fan could be provided.

The composite construction film 112 is cut out in the penetration area of the antenna 9 so that the opening 122 results. Subsequently, the opening area and the immediately adjacent area of the composite building film 112 provided with a spray film 10, so that then an air- and waterproof connection and thus a correspondingly dense functional layer 10 results.

FIG. 10 shows an installation or connection situation comparable to FIG. 9, wherein a cable 123 is provided instead of the antenna 9. Otherwise, reference may be made to the above statements.

FIG. 11 shows a mounting situation in which the connection to a wall 124 is shown. The wall connection is ultimately representative of rising components. Instead of the wall 124 so other rising components can be provided. Adjacent to the wall 124 is a rafter 121, on which a composite construction film 112 is applied. At the end, the composite construction film 112 is folded in the direction of the wall 124. The connection of the composite building film 12 to the wall 124 takes place via the spray film 10, which is applied on the edge of the composite building film 112 and the adjacent wall area. This ultimately results in the air and water tightness of the functional layer.

FIG. 12 shows a connection situation for a chimney 8. Here, the composite construction film 112 is cut out in the area of the chimney 8, so that the opening 122 results. Subsequently, the connection via the spray film 10, which then forms, as in the other imple mentation forms, on the one hand, the composite construction film 112 and on the other hand the chimney 8 in the connection area Ü overlaps. The overlap should preferably be greater than 2 cm, preferably greater than 5 cm and in particular in the range between 7 cm and 15 cm. It should be pointed out, moreover, that the chimney connection shown in FIG. 12 is only representative of comparable connections, such as windows, in particular roof windows and roof windows.

FIGS. 13 and 14 show a connection situation in which two composite construction films 112 which overlap are connected to one another via a spray film 10. Finally, the end-side joints of the composite construction films 112, which overlap, are masked and sealed over the spray film 10. It is understood that the embodiment shown in FIGS. 13 and 14 Not only in the area of the front-side joints, but also on the longitudinal joints or edges of Bauverbundfolien 112 application can be found.

Again, it should be noted that the aforementioned installation situations represent only selected applications. It is understood that the spray film 15 may in principle be provided at all hard to reach places, the spray film 10 is then adjusted by their properties according to the structural requirements.

The embodiments illustrated in FIGS. 15 to 20 ultimately relate to repair applications. FIG. 15 shows a situation in which a crack 125 is located in the composite construction film 112. Cracks of the type in question usually have a width of less than 3 mm, preferably less than 2 mm, in particular less than 1 mm. The length of such cracks can be arbitrary. Cracks of this type can be repaired quickly and easily by applying the spray film 10 to achieve air and water tightness.

In the embodiment shown in FIGS. 17 and 18, a gap 126 is shown schematically as a defect in the composite construction film 112. The gap 126 usually has a gap width between 3 mm to 20 mm, preferably between 3 mm and 10 mm. To bridge the defect, a support structure 127 is presently provided in the form of a fleece. The fleece may have a basis weight between 10 and 80 g / m ² , preferably between 10 and 50 g / m ² and in particular between 10 and 30 g / m ² . Via the support structure 127, the spray film 10 is applied, which then also adheres to the surrounding area of the composite building film and ensures a dense functional layer 10.

Finally, FIGS. 19 and 20 show a comparatively simple embodiment, in which so-called nail or stapler points, into the nails 115,

Clamps or the like fastener through the composite construction film

112 are driven, are sealed on the spray film 10 accordingly.

It is understood that, for example, in the embodiment according to

Fig. 6 may also be provided in the region of the nail 1 15 a corresponding seal. In all the aforementioned embodiments, in which the application of the spray film 10 is effected by spraying, it is such that the spray application can be carried out by various devices. These may, for example, be so-called airless devices, airmix devices and spray cans. The distance from the nozzle or outlet opening of the respective device to the surface to be sprayed should be about 30 cm.

Various embodiments of the spray or liquid film according to the invention have been tested in the laboratory for their suitability as a vapor barrier for various relevant properties. The results are shown in Tables Ia, Ib, 2a and 2b shown in Figs. 21 to 24. On the basis of five samples with the quantities shown in Tables Ia and Ib, the water vapor diffusion equivalent air layer thickness S _d and the water vapor diffusion resistance coefficient μ were determined, which in each case provides information on the suitability as a vapor barrier. Both series of measurements were taken in different climatic conditions. The results show that for an optimum vapor barrier, the effect of which depends on the thickness thereof, a (wet) layer of 100 to 1000 g / N ^{2 is to be} applied, the surface mass of the film being 80 to 500 g / N ² in the cured state , This corresponds to a film thickness of about 80 to 500 microns.

LIST OF REFERENCE NUMBERS

1 building

2 building shell

3 facade

4 roof

5 floor

6 facade area

7 facade area

8 fireplace

9 antenna

10 spray film

11 formwork

12 rafters

13 bottom

14 rafter field

15 outside

16 rafter side

17 rafter top

18 foil strips

19 more spray film

20 thermal insulation material

21 more formwork

22 undercover track

23 counter-bat

24 batten

25 hard cover

112 composite construction film

113 underground

114 folding

115 nail

116 throat rafters

117 rafters 118 throat formwork

119 area

120 Throat Bar

121 rafters

122 opening

123 cables

124 wall

125 crack

126 gap

127 support structure

Claims

claims:

1. A method for producing a functional layer of a building envelope (2), wherein the building envelope (2) has an internal building formwork (11) and a plurality of rafters (12) with rafter fields (14) provided between the rafters (12) and the formwork (11) ), wherein the functional layer is at least partially applied by brushing and / or spraying on the outside (15) of the formwork (11) and forms after application an air and / or waterproof, especially as a vapor barrier formed film (10).

2. The method according to claim 1, characterized in that on the formwork (11) at least one air and / or waterproof, in particular formed as a vapor barrier, along the rafter field (14) running film strip (18) is applied and that, preferably , the longitudinal edges of the film strip (18) and the film (10) overlap.

3. The method according to claim 1 or 2, characterized in that the film (10) is applied to at least one, in particular both rafter sides (16) of the rafters (12) of a rafter compartment (14) at least up to a partial height.

4. The method according to any one of the preceding claims, characterized in that the film (10) starting from the formwork (11) over a rafter height between 10 to 90%, preferably 20 to 80% and in particular more than 30% on the rafter side (16). is applied and / or that the sd value of the film (10) and / or the film strip at a relative humidity of 40% more than 1.5 m, preferably more than 0.8 m, more preferably more than 1.3 m and in particular more than 1.9 m.

5. The method according to any one of the preceding claims, characterized in that on the rafter top (17) a diffusion-open further foil strip and / or a further vapor-permeable film (19) is applied by spraying or brushing at least partially.

6. The method according to any one of the preceding claims, characterized in that the sd value of the further film strip or the further film (19) is less than 0.5 m, preferably less than 0.3 m and in particular less than 0.09 m.

7. The method according to any one of the preceding claims, characterized in that overlap the film (10) and the further film (19) or the further film strips, preferably in the region of the rafter sides (16).

8. The method according to any one of the preceding claims, characterized in that in the rafter compartment (14) a thermal insulation material (20) is introduced and / or above the rafters (12) another formwork (21) and / or another thermal barrier coating and / or a diffusion-open underlayment web (22) and / or another diffusion-open film applied by spraying or brushing and / or a vapor-permeable release layer and / or a counter battens (23) and / or a battens (24) and / or a hard outer cover becomes.

9. functional layer (10) of a building envelope (2), in particular produced according to a method of the aforementioned type, wherein the functional layer (10) at least partially has a spray applied by applying and / or brushing film, which after application an air and / or watertight Film educates.

10. A method for producing a functional layer (10), in particular according to claim 9, a building envelope (2), wherein the functional layer (10) is at least partially applied by brushing or spraying and after application an air and / or waterproof, especially as a vapor barrier formed film forms.

11. Building envelope with a functional layer according to claim 9, a building envelope (2), wherein the functional layer (10) is at least partially applied by brushing or spraying and after application forms an air- and / or waterproof, in particular designed as a vapor barrier film.

12. Building envelope (2) of a building (1) with at least one functional layer (10), wherein the building envelope (2) has a building inside formwork (11) and a plurality of rafters (12) with between the rafters (12) and the formwork ( 11) provided, wherein the functional layer is at least partially applied by brushing and / or spraying a film (10) on the outside (15) of the formwork (11) and after application an air and / or watertight, in particular formed as a vapor barrier film forms.