DK2496775T3

DK2496775T3 - Building with an air-tight vægindretning integrated and process for its preparation

Info

Publication number: DK2496775T3
Application number: DK10792967.1T
Authority: DK
Inventors: Pierre Etienne Bindschedler; Denis Lehnen
Original assignee: Soprema (Sas)
Priority date: 2009-11-04
Filing date: 2010-11-04
Publication date: 2016-08-01
Also published as: PL2496775T3; EP2496775A1; FR2952086A1; ES2581570T3; WO2011055084A1; EP2496775B1; FR2952086B1

Description

The present invention relates to the field of constructions with so-called "light" structure or framework, that is to say comprising a metal or wooden framework on which the external side walls and the roof are mounted, unlike so-called solid constructions, that is to say made from bricks, concrete, stone or the like.

However, the invention may also relate to a composite building, that is to say where only part has a light structure or framework, the invention relating only to this part.

The invention relates more particularly to closed buildings, for a residential (individual or collective), industrial or commercial purpose, having at the base good thermal insulation.

The walls of this type of building generally have a composite constitution with a plurality of layers with, from inside or outside: a rigid surface component based on panels or sheets forming a continuous wall structure, one or more layers of thermal and where applicable sound insulating material, and a facing layer or external skin. Alternatively, the rigid surface component based on panels or sheets (or boards) may be disposed between the insulating layer or layers and the external facing, such as for example external wooden wind-bracing panels in the case of a building with a timber framework. Additional insulation layers or a supplementary framework may also be provided.

Although this type of building in principle has satisfactory thermal insulation from the point of view of the facilities and materials used, there exists a pressing demand for substantially reducing the consumption and/or costs of heating/air conditioning such buildings.

However, the inventors have found that the losses are partly, or even mainly (from 10% to 15% for residential buildings, and up to 75% in some cases of non-residential buildings), related to uncontrolled air losses through the casing of the building (distinct from the air flows exchanged in a controlled manner for air-renewal purposes, for example by double flow circulation).

Furthermore, there also exists a demand for producing a temporary building enclosure, at least so as to be watertight, which makes it possible to carry out the supplementary fitting out or equipment work and the finishing work without requiring coordinating the internal and external work with each other, nor trades acting for producing same (obtaining a non-definitive temporary barrier for sufficiently disconnecting the internal and external environments in order to allow independent and different developments/fitting out on the internal and external faces of the building).

In addition, the watertightness and insulation of the building should be designed so as to be easily entrusted to a single service provider and the solution used should be reliable over time.

Through the document US 2002/164447, a building according to the preamble of claim 1 is already known.

The aim of the invention is to propose a building of the aforementioned type with an additional layer forming a screen that is substantially watertight and airtight and permeable to vapour, which is firmly supported and where the production and sealing of all its constituent strips are simple to execute.

This aim is achieved by the invention by virtue of the additional technical divisions of the characterising part of claim 1.

The invention also relates to a method for constructing a building according to claim 13.

The invention will be better understood by means of the following description, which relates to preferred embodiments, given by way of non-limitative examples and explained with reference to the accompanying schematic drawings, in which:

Figure 1 is a partial view in (horizontal) cross section of a lateral wall device according to the invention;

Figure 2 is a partial view in cross section similar to that of Figure 1, the wall part being in a temporary and incomplete state, before finishing;

Figures 3A and 3B are partial views in vertical section of the enclosure of a building with a terrace roof according to the invention, at the connection between a lateral wall and the roof, illustrating two embodiments of a first constructional variant;

Figure 4 is a partial view in cross section similar to that of Figures 3A and 3B, the enclosure of the building being in a temporary state before finishing;

Figure 5 is a partial view in vertical section of a subject matter similar to that of Figure 3A, illustrating a second constructional variant;

Figure 6 is a partial view in cross section of a subject matter similar to that of Figures 3A and 5, illustrating a third constructional variant;

Figure 7 is a partial view in (horizontal) cross section of the enclosure of a building according to the invention, at a corner formed by the connection between two lateral walls of said building;

Figures 8 and 9 are partial views in vertical section of a lateral wall device on a building according to the invention, at an opening situated in the top part (for example a window - Figure 8) and an opening situated in a bottom part (for example a door - Figure 9) respectively;

Figures 10 and 11 are partial views in vertical section of a lateral wall device forming part of a building according to the invention, at their connection with a lateral wall of the slab or base, these figures illustrating two constructional variants;

Figure 12 is a view similar to Figure 1 of a wall device according to another embodiment of the invention, and

Figure 13 is a simplified schematic view in cross section of a non-limitative example embodiment of a building integrating wall devices according to any of the variants in Figures 1, 3 and 5 to 12.

Figure 13, clarified by the partial views in Figures 1 to 12, shows a building 22 with a light structure or framework, in particular with a metal or timber framework, this building comprising lateral walls 10 and a roof 10' and forming a closed enclosure.

In this building 22, at least part of at least one lateral wall 10, advantageously at least one entire wall 10, consists of a wall device 1 forming a barrier between internal and external environments.

This or each wall device 1 comprises essentially, firstly a primary framework 2 formed by discrete elements 2', in particular metal or wood, forming part of the framework of the building 22, and onto which surface elements 3 of the panel or board type are fixed, which constitute a continuous wall structure 3', and secondly a thermal insulation layer 4 attached to one of the faces of the wall structure 3', and finally a facing layer or skin 5, optionally composed of individual facing elements 5' or skin portions carried by a secondary framework 6, this facing layer 5 forming the external face of the wall.

The or each wall device 1 comprises an additional layer 7 forming a continuous watertight screen, substantially airtight, and permeable to water vapour.

In accordance with the invention, said additional layer 7 is firstly formed by thin flexible screen strips 7', based on a thermoplastic material and assembled together by continuous welding at their adjacent edges 7" and secondly attached to the face directed towards the outside or covered by the facing layer or external skin 5, of the continuous wall structure 3' or of the thermal insulation layer 4, with a relatively rigid constitution.

By virtue of the particular properties of the screen strips 7', the or each wall device 1 constitutes an airtight barrier while being permeable to water vapour, thus preventing condensation phenomena, in particular in the insulation layer 4.

Furthermore, the screen 7 being watertight, it is possible to obtain a sealed structure element on its external face forming an impermeable screen against atmospheric agents.

In the present document, the term "lateral wall" relates essentially to the vertical walls delimiting the peripheral enclosure of a building. However, the invention may also apply to inclined or even sloping walls.

Furthermore, as already indicated previously, the invention relates to a building 22 in its entirety, that is to say where all the lateral walls 10 are formed by wall devices 1.

As illustrated by Figures 1 and 12, the or each wall device 1 according to the invention may be in accordance with two embodiments that differ through the relative positioning of the insulating layer 4 and of the continuous rigid wall structure 3'.

This is because the insulating layer 4 may be situated either on the external face of the wall structure 3' (Figures 1 to 11) or on the internal face of the latter (Figure 12).

The first constructional variant of the wall 10 (Figures 1 to 11) is normally best suited to buildings with a metal framework 2 and metal plates 3, whereas the second variant (Figure 12) finds a favoured application in buildings with a timber framework 2 and wooden panels 3 (an internal facing layer 21 may optionally be provided).

The following description, and accompanying drawings, relate more particularly to the first constructional variant (order of layers: 3', 4, 7, 5), but the features and advantages mentioned naturally apply also to the second variant (order of layers: 4, 3', 7, 5).

In accordance with the invention, the screen strips 7' consist of screen strips having a high degree of watertightness, a high degree of airtightness, high permeability to water vapour and good resistance to tearing, such as for example roof-deck screen or rain-barrier screen strips, these screen strips 7' being able to be welded together by the simple addition of heat, without any additional means or substance, for example by hot-air welding, at lateral portions of mutually overlapping strips T".

Preferentially, these screen strips 7' can be welded on site, in particular by means of a hot-air gun or the like, known to persons skilled in the art.

Connecting the screen strips 7' by welding, preferentially with partial lateral overlap between strips 7', makes it possible to obtain a continuous assembly of these strips, without any additional material, without requiring attached connecting pieces and being reliable over time.

In addition, such a possibility of assembling the strips 7' makes it possible to preserve all the intrinsic properties of said strips 7' at the entire screen 7 (watertightness and airtightness, permeability to water vapour, good resistance to tearing).

The screen strips 7' may consist of roof-deck screen strips in accordance with NF EN 13859-1 or rain-barrier screen strips in accordance with NF EN 13859-2.

By way of illustrative and non-limitative examples of their technical features, the strips 7' constituting the additional layer 7 may have: - W1 or W2 classification (EN 13859) with regard to the watertightness criterion; - permeability to air of less than 0.2 m3/m2.h, preferentially less than 0.1 m3/m2.h, at a pressure of 50 bar and in accordance with NF EN 12114; - a permeability to water vapour with an Sd value of less than or equal to 50 cm, advantageously less than or equal to 30 cm, preferentially less than or equal to 18 cm, in accordance with NF EN 12572; - resistance to nail tearing greater than 70 N, preferentially greater than 150 N, in accordance with NF EN 12310-1.

These strips 7' may for example correspond to roof-deck screen strips sold by the applicant under the designation "Soplutec", or to roof-deck screen strips sold by the applicant under the designation "Stratec" for roof structures or rain-barrier screen strips sold by the applicant under the designation "Stratec Facade" for the vertical walls.

According to an advantageously practical embodiment, in relation to the first embodiment of the invention, the screen strips 7' and the thermal insulation layer 4 are secured with the surface elements 3 by means of fixing screws 8 passing through said thermal insulation layer 4 and anchoring in the ribs or lips 3" projecting towards the outside of the wall structure 3', for example formed by the edges in contact of the surface elements 3, sealing means 8' being provided at each screw 8.

The sealing means 8' may consist of portions of bituminous sealing strips or other membrane material with a soft binder (non-woven or coated non-woven laminate), able to have the screws 8 pass through them while sealing the thread of the latter (for example portions of strips of material of the type sold under the designation "Soprasolin" by the applicant.

In the embodiment in Figure 12, the screen strips 7 may be either glued or fixed mechanically to the panels 3' of the continuous wall structure 3.

In order to increase the insulating properties of the or each wall device 1 according to the invention or of some of them, the building 22 may comprise, as is clear from Figures 1, 3A and 5 to 7 in particular of the accompanying drawings, a secondary thermal insulation and/or sound insulation layer 9 disposed between the continuous screen 7 and the facing layer or external skin 5, where applicable with the formation of a layer of air 9' between said layers 5 and 9. The constituent elements 6' of the secondary framework 6, for example in the form of profiled sections with an Ω cross section, integrated in said secondary insulation layer 9 and fixed to the surface elements or boards 3 of the wall structure 3', for example by means of screws 8 for fixing the continuous screen 7 and the thermal insulation layer 4.

In a variant, and as shown by Figure 3B, the additional insulating layer 9 may also be disposed internally.

In this case, the building 22 may comprise, at the or at least one wall device 1, a secondary or additional thermal and/or sound insulation layer 9 installed against the internal face of the surface elements 3 forming the continuous wall structure 3', said additional internal insulating layer 9 being covered or lined internally with a self-supporting structural and/or decorative layer 9", for example formed by plaster panels or sheets or the like (Figure IB).

Naturally, the aforementioned two variants may optionally be mixed between the various walls 10.

The intermediate construction state (after the installation of the screen 7 - see Figures 2 and 4), with the building 2 waterproofed and the establishment of airtightness at least at the walls 10, will be substantially identical for the two variants.

The definitive choice of the internal or external installation of the layer 9 may also be made after the aforementioned intermediate phase.

Where applicable, at least some of the walls 10 may have internal and external layers 9 (not shown).

As is clear from Figures 8 and 9 in the accompanying drawings, the building 22 may comprise, at the or each wall device 1, at least one opening or at least one passage opening 16 delimited by a fixed frame 16' of a window, door or similar device, the continuous screen 7 being secured continuously, for example by adhesive bonding, by mechanical connection or fixing, for example by clamping or connection by means of a profiled member 17, to said or each of said fixed frames 16'.

Likewise, as shown by Figures 6,10 and 11, said screen 7 is also secured continuously, by adhesive bonding, welding or mechanical fixing, to the elements 2' of the primary framework 2 surrounding said wall device 1 concerned, to the peripheral edge or longitudinal member of the slab 18, of the plinth, of the base or the like and, where applicable, to the screen 7 of another adjacent lateral wall device 1. A person skilled in the art understands that these various measures, the practical use of which does not require any more detailed description, make it possible to extend the particular properties of the or each wall device 1 stemming in particular from the screen 7 to the interfaces for connecting said wall device 1 to the equipment that it integrates or the structural components to which it is connected.

With a view to further reducing the risk of condensation in the insulating layer 4 and/or improving the acoustic characteristics of the wall (in particular when the panels or sheets 3 are perforated), a vapour barrier lining 19 may be disposed between the insulation layer 4 and the continuous wall structure 3', optionally being secured to the latter, at the or each wall device 1 of the building 22.

Such a vapour barrier lining may optionally consist of a screen of the type as described in the document EP 1 046 760 or sold by the applicant under the designation "Sopravap stick alu", or an equivalent non-bituminous product.

According to the invention, all the lateral walls 10 of the building according to the invention consist of wall devices 1 as described above and shown in the accompanying drawings, these walls 10 forming with the roof 10' a watertight building enclosure, substantially airtight and permeable to water vapour.

In its finalised version, unlike its intermediate embodiment (after installation of the screen 7), the watertightness of the building will result essentially from the external facing layer or skin 5, the screen 7 then, except in exceptional circumstances, contributing solely to the airtightness and the permeability to water vapour of the enclosure of the building.

As shown in Figure 7 of the accompanying drawings, the continuity of the various components constituting each of the lateral walls 10 in the form of a wall device 1 is provided at the junction edges between these walls 10. In particular, the screen 7 may have structural continuity at its junctions.

In accordance with the invention and as shown by Figures 3, 5 and 6 of the accompanying drawings, the roof 10' consists of a continuous bearing wall structure 11 covered with an insulating and sealing complex 12,12', the latter comprising on its underface a vapour barrier lining 13 that is connected continuously and sealingly to the continuous screen 7 that is airtight and watertight and permeable to water vapour, integrated in the lateral walls 10.

Advantageously, this vapour barrier lining 13 also has airtightness properties, like the screen 7, but optionally to a different degree.

According to a structural variant of the invention depicted in Figures 3A, 3B and 4 of the accompanying drawings, the strips 7' of the screen 7 forming the additional layer forming part of the lateral walls 10 are extended at the top edges 10" of these walls 10 by portions 14 forming returns and covering said edges 10".

As also shown in these figures, the vapour barrier lining 13 on the underface of the insulating and sealing complex 12, 12' is extended laterally by portions 13' forming covering edging, the latter extending over the top portions forming returns 14 of the screen 7 of the lateral walls, until it projects beyond said returns 14 and along the external face of said screen.

Advantageously, the portions 14 forming returns are fixed mechanically to the boards or panels 3 of the continuous wall structures 3' of the lateral walls 10 delimiting the top edges 10" of the latter, and the covering edging 13' of the vapour barrier lining 13 is assembled by welding, adhesive bonding or continuous cold adhesion with said portions 14 forming returns, and this according to the type of vapour barrier lining 13, the latter optionally being of the same type as the aforementioned vapour barrier lining 19.

With a view to being able to provide a watertight building before the external finishing works, in particular before the facing elements are installed (capping 20 and back veneer or back cladding 20', for example forming part of the parapet wall) intended to cover the top peripheral edges of the building (junction zone between the lateral walls 10 and the roof 10'), provision may be made for the lateral parts 12" of the insulating layer 12 of the complex 12, 12' extending above the top edges 10" of the lateral walls 10 and not covered by the layer or layers 12' forming the sealing surface component of said complex 12, 12' are covered by rain screen lining portions 15, falling freely beyond the top edges 10" of the lateral walls 10 and the covering edging 13' of the vapour barrier lining 13 (Figure 3A). These screen portions 15 may optionally provide only provisional and temporary sealing in an intermediate construction phase (Figure 3B).

According to another structural variant of the invention depicted in Figure 5 of the accompanying drawings, the strips 7' of the screen 7 forming the additional layer of the lateral walls 10 are extended at the top edges 10" of these walls 10 by portions 14 forming returns, which cover said top edges 10" and extend partially over the load-bearing continuous wall structure 11 and the vapour barrier lining 13 carried by this structure 11 (for example formed by elements of the steel pan type). These portions 14 are continuously assembled directly by welding, adhesive bonding or cold adhesion, or indirectly by means of a sealing membrane (where applicable with the formation of a sealing projection) to the vapour barrier lining 13, according to the nature of the latter, said portions 14 extending at least until they are situated under the layer or layers 12' forming the surface sealing component of the complex 12,12'.

Figure 6 illustrates a third structural variant of the invention, less efficient on a thermal level, in which the lateral wall 10 extends vertically beyond the roof 10' and forms a peripheral raised edge (parapet) covered by the capping 20. In this case also, the screen strips 7' are extended by portions 14 forming returns that cover the top edge 10" of the wall 10 concerned.

Finally, the invention also concerns a method for constructing a building as described above and depicted in parts on the figures of the accompanying drawings.

This method consists essentially of putting in place the slab 18, the substructure or the like and the primary framework 2, then forming a casing of a temporary watertight structure, that is substantially airtight and permeable to water vapour, formed by a roof 10' provided with an insulation and sealing complex 12,12' and temporary lateral walls 10 each comprising a continuous wall structure 3', a first insulating layer 4 that is external or internal (with respect to 3') and a continuous screen 7, and then to perform in an independent manner and possibly at separate intervals, operations of equipping, arrangement and cladding of internal surfaces, on the one hand, and external faces, on the other hand, of said lateral walls 10 and, if necessary, of the roof 10' and, lastly, perform the possibly desired or necessary finishing work.

After the phase of forming the casing of the temporary structure, the screen 7 thus forms the external casing layer of the various lateral walls 10 and is connected, in a continuous manner and with the formation of a watertight and airtight seal, to the roof 10' and to the slab 18, to the substructure or the like, thus making it possible to end up with a waterproof and airtight building.

In order to evaluate the performance of the enclosure of the building in the course of construction and optionally to make it possible to correct, before the finishing works, possible imperfections with regard to airtightness of the enclosure, the method advantageously consists of performing at least one test of the airtightness of the building by placing under pressure the interior volume of the latter, at least after forming the temporary watertight casing, which is substantially airtight and permeable to water vapour, locating the site of possible leaks and, if necessary, performing the necessary work to limit or even reduce said leaks.

Because of the quality of the airtightness of the enclosure of the building according to the invention, these tests may be performed with equipment of limited power (blowing door), even in the case of a building with a large volume (for example greater than 1000 m3).

By virtue of the invention, it is therefore possible to offer a building with a light framework, the thermal performances of which are appreciably improved (the inventors recorded a gain of 50% to 75% in terms of heating energy consumption).

Furthermore, it is also possible, during the construction of the building, to end up quickly with a temporary waterproof construction, thermally insulated and substantially airtight. This temporary construction enables the various exterior and interior contractors to carry out the work allocated to them independently, the airtightness of the building being the responsibility of a single service provider, even with regard to the interfaces between the various lots of work.

The invention is consequently based on the basic principle that consists of using the characteristics of an existing product that is airtight and permeable to water vapour to make it possible to achieve the permeability of a building to the outside air (which is contrary to the usual practice). This particularity of achieving impermeability to the outside air with a wall that is permeable to water vapour (to avoid any problem of dew point and condensation in the wall) makes it possible to be free from all the interior singular points that are difficult to deal with (interior wall, intermediate slab, various openings, etc.). Likewise, the permeability to water vapour enables the various components to dry in the event of accidental wetting.

Naturally, the invention is not limited to the embodiments described and depicted in the accompanying drawings. Modifications remain possible, in particular from the point of view of the constitution of the various elements or by substitution of technical equivalents, without departing from the scope of protection of the invention.

Claims

A building (22) having a light structure or frame structure, in particular with a metal or wooden frame structure comprising lateral walls (10) and a roof (10 ') and forming a closed enclosure wherein all the lateral walls (10) of the building (22) consists of a wall device (1) comprising: - a primary frame structure (2) formed of separate elements (2 '), in particular made of metal or wood, forming part of the frame structure of the building (22), - surface elements (3) of the plate or board type attached to the primary frame structure and forming a continuous wall structure (3 ') which forms a barrier between the interior and exterior environment, - a thermo-insulating layer (4), - an additional layer (7) forming a a continuous waterproof screen, substantially airtight and permeable to water vapor, and - a layer of clothing or skin (5) optionally consisting of individual clothing elements (5 ') or parts of skin supported by a secondary frame structure ction (6), wherein the layer of cladding (5) forms the outer surface of the wall, the roof (10 ') being formed by a continuous supporting wall structure (11) covered by an insulating and sealing complex (12, 12') and the lateral walls (10) of the building (22) forms with the roof (10 ') an overall enclosure of the building which is waterproof, airtight and permeable to water vapor, the building (22) being characterized in that - the layer of thermal insulation (4) is applied to the outer surface of the continuous wall structure (3 '), - the additional layer (7) is formed, in part, of low-thickness flexible screen strips (7'), with a thermoplastic material base with an increased waterproofing, a high degree of airtightness, high water vapor permeability and interconnected by continuous welding with a simple energy supply, without additional means or substance, for example by hot air welding, by lateral portions of mutually overlapping strips (7 "') and partly applied to the surface facing it outwards and the insulating and sealing complex (12, 12 ') comprises a screen vapor barrier (13) connected in a continuous and sealing manner to the further layer (7) below.

Building according to claim 1, characterized in that the strips of screen (7 ') are selected from a group formed by strips of roof screen and strips of rainproof screen.

Building according to claim 1 or 2, characterized in that the strips (7 ') forming the additional layer (7) have: - a classification W1 or W2 (standard EN 13859) in terms of waterproofing; - an air permeability of 0.2 m3 / m2.h, preferably less than 0.1 m3 / m2.h, under a pressure of 50 Pa and according to standard NF EN 12114; - a permeability for water vapor having a value Sd less than or equal to 50 cm, advantageously less than or equal to 30 cm, preferably less than or equal to 18 cm, according to the standard NF EN 12572; - a tensile strength greater than 70 N, preferably greater than 150 N, according to the standard NF EN 12310-1.

Building according to any one of claims 1 to 3, characterized in that the strips of screen (7 ') and the thermo-insulating layer (4) are connected to the surface elements (3) by means of fastening screws (8) through the thermo-insulating layer ( 4) and anchors for ribs or lips (3 ") projecting towards the outside of the wall structure (3 '), for example formed by the edges in contact with surface elements (3), where sealing means (8') are provided at each screw (8).

A building according to any one of claims 1 to 4, characterized in that it comprises, by the at least one wall device (1), a secondary or additional thermal insulation and / or sound insulating layer (9) arranged between the continuous screen (7). ) and the layer of lining or outer skin (5), optionally with the formation of an air layer (91) between the layers (5 and 9), and by the constituting elements (6 ') of the secondary frame structure (6), for example in the shape of profiles having a Ω cross-section is integrated into the secondary insulating layer (9) and fixed to the surface or board elements (3) of the wall structure (3 '), for example by means of screws (8) for fixing the continuous screen (7) and the thermo-insulating layer (4).

A building according to any one of claims 1 to 4, characterized in that it comprises at least one wall device (1), a secondary or additional thermal insulating and / or sound insulating layer (9) installed against the interior surface of surface elements (3) forming the continuous wall structure (3 '), wherein the additional inner insulating layer (9) is covered or doubled internally by a structural and / or decorative self-supporting layer (9 "), for example formed by plasterboard or boards or similar.

Building according to any one of claims 1 to 6, characterized in that it comprises at least one wall device (1), at least one window opening or at least one passage opening (16) defined by a frame (16 ') of a window device. , door or the like, wherein the continuous screen (7) is connected in a continuous manner, for example by adhesion, connection or mechanical fastening, for example by clamping or connection by means of a profile (17), to it or to each of the frames (16 '), and in that the screen (7) is also connected in a continuous manner, by adhesion, welding or mechanical attachment to elements (2') of the primary frame structure (2) surrounding said wall device (1) on the edge or the peripheral beam of the plate (18), the base, the substructure or the like, and optionally the screen (7) of another arrangement of the laterally adjacent wall (1).

A building according to any one of claims 1 to 7, characterized in that a vapor barrier (19) is arranged between the insulating layer (4) and the continuous wall structure (3 ') and optionally connected to the latter, by the or each wall device (1).

Building according to any one of claims 1 to 8, characterized in that the strips (7 ') of the screen (7) forming the additional layer forming part of the lateral walls (10) extend at the upper edges (10 "). ) of the walls (10) with portions (14) forming returns and covering the edges (10 ") and by the vapor barrier (13) beneath the insulating and sealing complex (12, 12 ') extending laterally with portions (13') which forming overlaps, the latter extending over the upper return portions (14) of the screen (7) of the lateral walls until passing beyond the returns (14) and along the outer surface of the screen (7).

Building according to any one of claims 1 to 9, characterized in that the parts (14) which make returns are mechanically fixed to the boards or plates (3) of the continuous wall structures (3 ') of the lateral walls (10). the upper edges (10 ") of the latter and in that the covering overlaps (13 ') of the vapor barrier (13) are joined by welding, adhesion or continuous cold adhesion to the parts (14) which form returns as a function of the type of vapor barrier (13).

Building according to claim 10, characterized in that the lateral parts (12 ") of the insulating layer (12) of the complex (12, 12 ') extend over the upper edges (10") of the lateral walls (10) and not covered by the layer (s) (12 ') forming the superficial sealing component of the complex (12, 12') covered by portions of rain shield (15), extending freely beyond the upper edges (10 ") of the lateral walls (10) and the overlaps (13 ') of the vapor barrier (13).

Building according to claim 1, characterized in that the strips (7 ') of the screen (7) forming the further layers of lateral walls (10) extend at the upper walls (10 ") and the walls (10) with parts (14). forming returns by the parts (14) covering the upper edges (10 ") and extending partially over the structure of the continuous supporting wall (11) and the vapor barrier (13) supported by this structure (11) and by these parts ( 14) is assembled continuously by welding, adhesion or cold adhesion, to the vapor barrier (13), as a function of the nature of the latter, the portions (14) extending at least until they are below the layer (s) (12 ') forming the superficial sealing component of complex (12, 12 ').

Method for constructing a building according to any one of claims 1 to 12, characterized in that it consists essentially of putting the plate (18), the substructure or the like and the primary frame structure (2) in place, then: forming a casing of a temporary waterproof structure which is substantially airtight and permeable to water vapor, formed by a roof (10 ') provided with an insulation and sealing complex (12, 12') and temporary lateral walls (10) each comprising a continuous wall structure (3 '), a first interior or exterior insulating layer (4) and a continuous screen (7), and then performing in an independent manner and optionally at separate intervals, the operation of equipment, arrangement and cladding of the interior, respectively. surfaces and exterior surfaces of the lateral walls (10) and optionally of the roof (10 ') and finally to perform any desired or necessary finishing work.

Method according to claim 13, characterized in that, after the phase of forming the casing of the temporary structure, the screen (7) forms the outer casing layer of the various lateral walls (10) and is connected in a continuous manner to the formation of a waterproof and airtight seal to the roof (10 ') and to the plate (18) to the substructure or the like.

Method according to claim 13 or 14, characterized in that it comprises performing at least one test of the airtightness of the building by pressurizing the inner volume of the latter, at least after forming the temporary waterproof casing which is substantially airtight and permeable to water vapor, to locate any leaks and to take any steps necessary to limit or reduce these leaks.