WO2014135272A2

WO2014135272A2 - System for fire protection of buildings

Info

Publication number: WO2014135272A2
Application number: PCT/EP2014/000554
Authority: WO
Inventors: Hans-Dieter Middendorf; Stefan Schworm
Original assignee: Saint-Gobain Isover
Priority date: 2013-03-05
Filing date: 2014-03-05
Publication date: 2014-09-12
Also published as: DE102013003796A1; EP2964849A2; SA515360984B1; KR101853419B1; RU2015142078A; RU2622277C2; WO2014135272A3; KR20150127651A

Abstract

In a system for the fire protection of buildings with boards consisting of flammable thermoplastic insulating materials with flame bars interrupting the covering for forming a barrier against fire propagation the upper face of the flame bar is provided with a slanted surface inclined downwardly in the direction of the building wall.

Description

SYSTEM FOR FIRE PROTECTION OF BUILDINGS

The invention relates to a heat insulating outer covering for buildings including flammable or combustible insulation plates, in particular insulation plates made from thermoplastic insulation materials, in particular rigid insulating foams like expanded polystyrene (EPS) which are attached to a building wall, in particular according to the preamble of patent claim 1.

Heat insulating coverings of hard foam boards of this type are commonly known. Problems associated with using materials that are "flammable", this means only start to burn under direct flame impact or "combustible" materials, this means materials burning by themselves under respective temperature have caused mandatory standards like a building code or state building codes in Germany to require "flame- resistant" materials starting at a building height of 7 m up to a building height of 22 m (building classes 4 and 5) for the flammability properties of said systems. In order to comply with this flame resistant requirement typically flame bars made from a noncombustible material are introduced into the insulating layer in certain

arrangements and/or at certain distances. In practical applications, typically in particular continuous or circumferential layers made from flame bars are being used and applying flame bars above each opening in the facade, this means doors, windows, etc., are known in the art. For an arrangement above the openings a flame bar is also designated an architrave safety. A preferred material for flame bars or architrave safeties of this type is mineral wool, in particular rock wool in particular with densities in the range from 50 to 180 kg/m³. Besides that also flame bars made from a material that remains form stable under heat impact like PUR, phenolic resin foam or polyisocyanurate foam (PIR) are known. In an exemplary manner reference is made to DE 25 51 121 or DE 20 2008 001 750 U1 which refer to flame bars made of mineral wool, PUR or PIR rigid foam with rectangular cross-section, so that the flame bar can easily be applied to a bottom layer of hard foam boards applied to the external building wall and in the same manner an additional layer of insulation plates may be easily applied on to of the flame bar layer.

After applying a stucco layer which typically includes a stucco carrier with a stucco base and outer stucco, typically using adhesion enhancers, the flame bars form a noncombustible blocking layer between the building wall and the stucco. Thus, the insulation layer made from flammable or combustible insulating plates is divided into particular sections in vertical direction and flame propagation is effectively impeded. The entire system including the insulation layer, optionally flame bar and applied stucco, is designated, as heat insulating compound system. Detailed technical information which also has been included into the federal building code or the state building codes can be derived from the technical system information 6 "WDV- Systeme zum Thema Brandschutz" by the trade association Waermedaemm- Verbundsysteme e.V.

Heat insulation composite systems have to be certified and the system vendor also has to prove compliance with particular fire protection requirements for the entire system besides additional system properties. The granted certifications for various system providers show that non combustible flame bars fulfill the requirements when the stucco covered facade is exposed to fire and delay or prevent a propagation of the fire.

From the state of the art heat insulation boards with integrated flame bar are known (AT 005 285 U1) where hard foam heat insulation plates, in particular expanded polystyrene are provided with a recess on there side facing the building wall to be covered, non-combustible insulation material, in particular mineral wool, being embedded form-fit into the recess. Here the sides of the recesses may be undercut, to safely secure the flame bar material in the recesses of the hard foam insulating boards. Except for their side facing the wall the combustible insulating material is fully covered by the material of the insulating plate, thus in particular providing a uniform material surface of the application of the stucco. As the insulating plate consists of expanded polystyrene with a lower density than the mineral wool chambered in the hard foam board the danger exists that the bottom region of the insulating board is subject to deformations which may impair installation of the boards but may also reduce the function of the flame bar embedded into the hard foam board.

These deficiencies are remedied in DE 20 2005 000 129 by a flame bar that is completely embedded in a polystyrene hard foam plate, in particular embedded completely therein through foaming. Thus a secure embedding of the flame bar layer is achieved without deformations or bulging of the heat insulation plates occurring. The material used for the inlay here is mineral wool which is form-stable under heat impact, as for example PUR or PIR. A face of the embedded flame bar is inclined relative to the building wall so that a collection basin for melted insulation material is formed in case of a fire.

This system has not been successful in practical applications because it is too expensive and the fire protection is insufficient, too. In case of a fire molten material of the foam plate may flow in downward direction of the front side and can ignite the insulation plates that are arranged below the flame bar.

In practical applications on construction sites typically the insulating covering with the flame bars is initially applied over an entire surface of the building wall and attached thereto, for example through gluing and/or anchoring. Subsequently the stucco is applied separately by a stucco team. Between insulating the building wall and stucco covering a time period of several days or weeks can go by. In this time period the flammable or combustible insulation plates are not covered but are left open.

When a fire occurs at an open covering of this type the fire can propagate rather easily from one section into another section arranged there above. In this case the flame bar can be skipped on the front side since the stucco is not applied yet.

In view of this problem it is an object of the invention to provide a system that reduces flame propagation at an open covering that is not yet covered with stucco and made from combustible or inflammable material, wherein the system can be produced and attached in a simple manner.

The object is achieved with a system with the features of patent claim 1. Preferred embodiments are objects of the dependent claims 2 to 9. An advantageous method and an advantageous flame bar can be derived from the claims 10 and 11.

The invention is based on the idea that several factors are relevant for effective fire protection of a building fagade formed from insulating plates in particular made from thermoplastic insulating materials before applying the stucco. On the one hand side there is a safety in the sense of a collection function for a melt formed on the fire impact from the insulation material plates by the flame bar in order to collect to a high extent the melt by the flame bar and on the other hand to prevent flowing of the melt in downward direction over the flame bar as far as possible.

According to the invention this is achieved by the flame bar, the material of which being non-flammable or thermo-stable, i.e. form-stable under heat impact, the upper face of said flame bar being designed such that on the one hand a melt formed by the insulating material plates above the flame bar is discharged in the direction of the building wall and is retained by the flame bar for a time sufficient for fire protection. In this respect it is advantageous to provide the face with a slanted surface which is not sloped outwardly towards the stucco layer but rather inwardly towards the building wall. This slanted surface on the one hand involves a discharging function guiding melt in the direction of the building wall and not to the outside and on the other hand due to the inclined form a collection chamber is formed in the direction of the building wall, which makes it possible to retain melt formed for a sufficient time until suitable fire protection measures are taken by the fire brigades, etc. Here it is especially advantageous if the slanted surface starts directly at the face of the flame bar extending diagonally downwards towards the building wall. This promotes all steps to prevent insulating material melt from flowing down over the face of the fire bar. Thus, this measure effectively delays the propagation of fire until suitable measures to restrain or extinguish the fire can be taken. In this context it also has to be

considered that buildings are built in process steps and this means the insulating plates for the facade covering are applied before the insulating plates are overall stucco covered in a subsequent process step which typically is only performed for large buildings after a couple of days or even weeks. Within this time period according to conventional fire protection measures the provided flame bars would not effectively prevent fire propagation. Thus, the invention provides a substantial safety effect.

In an advantageous embodiment of the invention the fire bar is blank over its complete circumference, this means free of coatings, this means fire protection coatings and similar matters are not applied, which is advantageous in respect of the production costs. Blank in the sense of the invention also means that the fire bar is not covered, especially it is not integrated into an insulation plate, rather all outer surfaces of the fire bar are so to say made of the same material as the fire bar itself, namely a material which is form-stable under heat impact, specifically hard foam as PUR or PIR, silicate coated EPS, phenolic resin foam and so on or a non- combustible material. Thus the front side of the fire bar is free to be used as stucco carrier for application of stucco onto the covering. It goes without saying that also suitable materials for enhancing the stucco binding to the front surface of the fire bar or similar may be provided, this means blank in the sense of the invention means that the outer surfaces of the fire bar are made of the same material as the material of the fire bar itself, according to the above definition. These measures also contribute to the fact that in contrast to the state of the art flowing down the front side of the fire bar, this means the side facing away from the building wall, is prevented to a large extent. Here it is preferred that the front side of the fire bar flushes with the adjacent insulating plates.

The non-combustible material has a smooth surface so that fine distribution of the collected EPS-melt and/or sticking in a surface increased by porosity of the face in contrast to the slanted surface is excluded, thus decisively improving the fire properties. Suitable non-combustible materials with sufficiently smooth surface have an open porosity according to DIN EN 1936 of less than 20 volume percent, preferably less than 10 volume percent, as for example gypsum moulded parts, terracotta, ceramics, etc. Due to the usually considerably lower heat insulating properties of the non-combustible materials in contrast to the thermo-stable, i.e. form stable under heat impact, materials specifically hard foam as PUR, PIR, silicate coated EPS, these are usually less preferred.

In an advantageous embodiment of the invention the slanted surface extends over the entire face of the flame bar, this means from the building wall to the outer surface wall of the fairing.

In an advantageous embodiment the slanted surface is only provided over a partial thickness of the flame bar and in particular runs out at the upper and/or lower end through a shoulder into the lateral surfaces of the flame bar. Thus, one or plural stop or contact surfaces for insulation plates arranged there above are advantageously formed.

It is advantageous for the collection function of the flame bar that the face is configured at an angle < 70° preferably in a range from 30 - 60 ° and particularly preferably an angle of 40 - 50°.

In an advantageous embodiment the insulation plates adjoining the flame bar are configured at their bottom sides so that they are adapted to a top side of the flame bars, thus also configured complimentary to the outlet direction, in particular configured with a respective slanted surface that is provided with shoulders on one side or both sides as required, optionally with intermediary shoulders.

In another advantageous alternative embodiment corner elements are provided which are adjacent to an upper face of the flame bar and are used as bridge elements between a flame bar and insulation plates arranged directly above. Thus, furthermore conventional insulating plates can be used and thus with a plate shaped cuboid structure which do not have to be configured according to the flame bars.

A corner element of this type is advantageously configured from the material of the insulation plate. This has the advantage that the conventional insulation plate when it adjoins the flame bar does not have to be configured according to the flame bar or according to the upper face of the flame bar. The corner elements advantageously supplement the flame bar to form a cuboid, so that regular cuboid shaped insulation plates can be used adjacent thereto and above. It is also feasible in particular to assemble the flame bars with the corner element at the factory, for example to glue them together, so that a cuboid shaped component can be advantageously used at the construction site.

Advantageously, the thickness of the fire bar, i.e. the dimensions of the fire bar in a direction horizontal to the building wall onto which the fire bar is installed as a covering, corresponds to the thickness of the insulating plates positioned above and below it. In this respect it is advantageous that the face of the fire bar in the installation position on the building wall flushes with the adjacent outer surfaces of the covering, thus forming a continuously smooth surface for the application of the outer stucco. This thickness dimension also essentially ensures that the insulating plates do not protrude from the fire bar, so that in case of a fire melt could drop down unhindered.

Eventually the invention provides a flame bar configured according to at least one of the claims 1 through 10 which facilitates a suitable retaining function for the melt.

Thus, the invention claims a system for fire protection including flame bars, a method for mounting a respective insulation, a facade covering with insulation material plates using flame bars of this type and it also claims a flame bar by itself.

Subsequently embodiments of the invention are schematically illustrated with a drawing figure, wherein:

FIG. 1 illustrates a vertical partial sectional view of a facade covering for fire protection at a building wall with a flame bar;

FIG. 2 illustrates a perspective view of an embodiment of a flame bar

according to the invention; and

FIGs. 3-16 illustrate additional alternative embodiments in a vertical sectional view and a perspective view of a flame bar.

In one embodiment according to FIG. 1 a building wall is designated with the reference numeral 1 and a facade covering of the building wall is designated with reference numeral 2, wherein the building wall is configured for fire protection. For this purpose circumferential layers of flame bars are provided for standalone buildings, wherein the layers can be provided in plural offset layers as a function of the building height. In buildings which are established in a gap between two other buildings respective continuous layers of flame bars are provided in the facade insulation. FIG. 1 illustrates an embodiment with a flame bar 3 which interrupts the insulation layer including insulating plates and prevents fire propagation. In the illustrated embodiment the facade covering 2 is formed from hard foam plates made

RECTIFIED SHEET (RULE 91 ) ISA/EP from expanded polystyrene (EPS) which are attached to building wall 1 in a typical manner, thus through gluing and/or anchoring. According to FIG. 1 the flame bar 3 is arranged between a lower insulation plate 4 made from EPS and an upper insulation plate 5 made from EPS, wherein another insulation plate 6 is visible above the insulation plate 5. The insulation plates including the flame bar 3 are placed flush on top of one another without forming gaps between the insulation plates. Also the flame bar 3 is attached in the usual manner to the facade wall 1 , thus by gluing and/or anchoring or nailing or similar.

In the illustrated embodiment the flame bar 3 is formed from polyurethane and configured with a collection device that is overall designated as 7 so that the molten insulation material is captured and retained at least for a suitable period of time so that a flow away from the building wall 1 in outward direction to the outer surface 8' of the flame bar 3 in case of a fire and dripping off from there in downward direction is prevented, thus when the upper insulation plates 5 and 6 are on fire. Through this measure of controlled retaining and capturing the insulation material melt under fire impact, fire propagation is effectively mitigated by the flame bars 3 also without any applied stucco, thus in an intermediary condition of the insulated building.

In the embodiment according to FIGs. 1 and 2 the collecting device 7 is formed by a slanted surface 9 which extends from the top down at a slant angle in an inward direction towards the building wall 1 to be covered. This is advantageous for the collection and capture function and the core idea that the deflection device causes molten insulation material to be retained and collected as long as possible at the upper face of the flame bar. In the illustrated embodiment the angle a of the slanted surface 9 relative to horizontal is 45°. The steeper the angle of the slanted surface 9, the larger the capture basin for the melt, the greater the slant angle the more acute becomes the flame bar 3 which can cause a risk of getting damaged during transportation or storage of the flame bars at acute edges of the flame bars.

Therefore the angle range for the slanted surfaces 9 is preferably between 30° - 50°.

In the collection device 7 formed by the slanted surface 9 which forms the upper face of the flame bar 3, an insulation plate 5 joins in the illustrated embodiment, wherein the lower face of the insulation plate is configured complementary to the upper face of the flame bar, thus for example with a respective slant angle. It extends like the slanted surface 9 of the flame bar 3 from the side oriented towards the housing wall 1 continuously to the outside of the insulation plate 5.

According to FIG. 1 the lateral surface or the vertical sectional surface of the flame bar 3 are formed by a trapeze like the insulation plate 5 that is configured in a complimentary manner with respect to the lower face for a connection with a flame bar 3. Depending on the embodiment of the flame bar 3 the thickness of the flame bar, this is a dimension perpendicular to the housing wall 1 , is approx. 100 to 500 mm and the height of the outer lateral surface 8 is approx. 200 to 1000 mm without being limited thereto. The length of the flame bar that is evident from FIG. 2 corresponds to a typical length of such flame bars which are selected according to dimensions of the insulation plates used. In the illustrated embodiment the length of the flame bar is for example 625 mm, wherein dimensions up to 1200 mm are typical for such flame bars. During assembly the flame bars 3 are placed flush with their lateral surfaces thus with the lateral surface 2 to the adjacent flame bar 3 and thus form a continuous layer which interrupts the layer made from insulating plates arranged on top of one another to form a barrier against flame propagation.

In the embodiments illustrated in FIGs. 3 seqq. for illustration purposes a distance between the flame bar 3 and the component arranged there above, thus the insulation plate 5 is illustrated in order to emphasize the face contours of the flame bar 3 and also of the component arranged there above, which is illustrated by double lines on both sides. In reality the upper component, thus the insulation plate 5, certainly rests directly on the flame bar 3 arranged thereunder.

The embodiment of FIGs. 3 and 4 differs from the preceding embodiment only in the configuration of the upper face 9. This in turn is formed by a slanted surface 9a which extends over a major portion of the flame bar 3 but is flattened at it is ends so that shoulders 14a and 14b are formed in the portion of both lateral surfaces of the flame bar 3, wherein the slanted surface 9a transitions through the shoulders into both opposite outer surfaces of the flame bar 3. In the illustrated embodiment the shoulders 14a and 14b extend perpendicular to the lateral surfaces of the flame bar 3 and thus the housing wall 1. The thickness extension L (FIG. 4) of the shoulders is in a range between 10 to 20 mm, preferably 10 to 15 mm for a thickness d of the flame bar 3 in a range of 100 to 400 mm in a range of 10 to 20 mm, preferably 10 to 15 mm without these ranges being limitations.

The insulation plate 5 is configured in a complementary manner with respect to its lower face by which it contacts the flame bar 3 as clearly apparent in FIG. 3, thus it is also configured with a slanted surface 11 a and with shoulders 15a and 15b. The angle a of the slanted surface is 30° in the illustrated embodiment.

In the embodiment of FIGs. 5 and 6 the collection device 7 of the flame bar 3 is formed by a slanted surface 9b which extends downward from the front side of the flame bar and which transitions into a shoulder 14b which is formed analogous to the shoulder 14b of the preceding embodiment.

The shoulder 14b like the two shoulders 14a and 14b of the embodiment according to FIGs. 3 and 4 is used as a stop- or contact surface for the hard foam element 5 arranged there above, which as clearly apparent from FIGs. 5 and 6 is configured as a complementary element to the face of the flame bar 3, thus also includes a respective slanted surface 11b with a transitioning shoulder 15b. In the illustrated embodiment the angle a is 60° for the slanted surface 9b and the slanted surface 11 b. Also the thickness dimensions of the shoulders 14b and 15b are sized accordingly.

The embodiment according to FIGs. 7 and 8 illustrates a device 7 in which the shoulder 14a is only provided at a lateral surface 17 of the flame bar 3, wherein the lateral surface is oriented towards the outside of the covering, wherein the deflection device is furthermore formed by a slanted surface 9c which extends to the housing wall of the flame bar. The angle a in this embodiment is approximately 45°. Also the insulation plate 5 applied from above is configured in a respective complementary manner at its lower face, thus it includes a shoulder 15a and a slanted surface 11c.

In the embodiment according to FIGs. 9 and 10 the device 7 is configured analogous to the embodiment according to FIG. 1 , thus by a complete slanted surface 9 which continues over the entire face, wherein the slanted surface 9 is illustrated in a exemplary manner with an angle a of 45°.

This embodiment according to FIGs. 9 and 10 differs from previous embodiments in that no insulation plates are required anymore that have to be configured according to the device 7 of the flame bar 3 in order to connect with the flame bar 3 on top, rather insulating plates can be used that have the normal cuboid plate structure, thus no particular finishing is required anymore for the connecting hard foam plates at the flame bar 3. This is achieved by using a corner element 20 which is formed like the flame bar 3 from nonflammable or non combustive material, thus mineral wool, in particular coated mineral wool, and which has triangular shape in a sectional view, wherein the face of the corner element 20 oriented towards the flame bar 3 is configured adapted to the device 7, thus with the respective slanted surface 21 which is configured analogously continuous over the thickness. The connection surface 22 of the corner element 20 extends in mounting position as apparent from FIG. 9 perpendicular to the housing wall 1 , so that typical insulation plates can join without a special configuration, thus the insulation plate 5.

The embodiment according to FIG. 11 and 12 is similar to the preceding embodiment besides the fact that the device 7 is configured analogous to the embodiment according to FIGs. 3 and 4, wherein however the angle a is 45° herein. In this respect the device 7 is configured according to FIG. 11 with a slanted surface 9a and end shoulders 14a and 14b.

The corner element 20 in turn is made from EPS and provided with a slanted surface 21a at which however a contact shoulder 5b joins in the lower portion, whereas the slanted surface 21a transitions with an acute angle in the upper portion into the upper face 22 of the corner element 20 as clearly apparent for the corner element 20 from FIG. 2. In assembled condition of the corner element 20 its upper tip 23 or upper edge 23 joins the shoulder 14a so that the upper face 22 of the corner element 20 and the shoulder 14a are flush with one another. Thus, the upper faces of the corner element 20 and of the flame bar 3 complement one another to form a cuboid on which the upper insulation plate 5 is then placed.

The embodiment according to FIGs. 13 and 14 is with respect to the configuration of the flame bar 3 and with respect to the collection device 7 similar to the embodiment according to FIGs. 5 and 6 which means that the device 7 includes a slanted surface 9b and a contact shoulder 1 b towards the backside 8 and in a mounted position the corner element 20 with its slanted surface 21b contacts the slanted surface 9b so that the upper face 22 then forms a contact- or stop surface for the upper insulation plate 5 made from Styrofoam. Both slanted surfaces are at an angle a of 45° in the illustrated embodiment.

The embodiment according to FIGs. 15 and 16 with respect to flame bar 3 is similar to the embodiment according to FIGs. 7 and 8, this means the device 7 is formed by a slanted surface 9c which extends to the outer surface 8 of the flame bar 3 and has a contact shoulder 14a in its upper portion. Accordingly also FIG. 16 illustrates the flame bar 3, wherein the corner element 20 has an accordingly configured triangular section and forms a cuboid together with a flame bar 8 in mounted condition, wherein the insulation material plate 5 is the placed onto the cuboid. The slanted surface 21c is continuous with respect to the corner element 20, thus configured without a shoulder.

The embodiments according to FIGs. 9 through 16 are similar with respect to an additional arrangement of a corner element 20 which forms a cuboid together with a flame bar 3 so that insulation plates without particular configuration can be used for connecting to the flame bar 3.

As can be derived from the drawing figures the exposed front side 8' of the flame bar 3 is advantageously flush with the outer surface of the insulation plate which is advantageous for subsequent stucco application. Advantageously also the rear side of the flame bar 8 facing the building wall flushes with the rear side of the adjacent insulating boards so that the thicknesses of both elements correspond to each other. The flame protection measure therefore does not change the outer configuration provided by the insulation plates.

The invention furthermore facilitates additional configuration options.

Thus for example the slanted surface can also have a convex and/or concave contour besides an advantageous planar contour.

The flame bar can be glued together with the corner element, wherein the coating can simultaneously act as glue, or a suitable flame retardant glue is useable.

The face can also be configured in the form of a step profile or a groove- key profile. Preferably the step surfaces oriented parallel to the front side are also provided with a coating. Particularly preferably the arrangement of a flame bar with a step profile is performed so that the nose is arranged in the facade covering remote from the building wall so that a cuboid collection chamber is formed.

Claims

PATENT CLAIMS

1. A system for fire protection of buildings whose exterior walls are at least partially coated with insulation plates made from flammable thermal plastic insulation material, in particular hard foam plates made from polystyrene, polyurethane and similar which are attached to a building wall through gluing and/or anchoring, wherein the covering is interrupted through at least one preferably continuous or circumferential layer of flame bars and/or includes a flame bar above each opening, wherein the flame bars are formed from materials that are non combustible and/or remain form stable under heat impact, specifically hard foam as PUR, PIR, silicate covered EPS or similar, and form a barrier between an upper and a lower layer of the insulation plates (4 - 6) against flame propagation in case of a fire, wherein the insulation plates made from thermoplastic insulation material are arranged above and/or below the flame bars, wherein the covering is prepared for application of stucco,

wherein the face (9) of the flame bar (3) oriented towards the above layer of insulation plates (5) has a slanted surface (9) inclined downwardly towards an outer building wall (1) and that the upper front side (9) and the front side 8'of the flame bar facing away from the building wall is blank, i.e. free of coatings and free of a covering such that the front side of the flame bar is directly available for the application of stucco.

2. The system according to claim 1 , wherein the slanted surface (9) is inclined at an angle of≤ 70°, preferably in a range of 30° to 60°, particularly preferably in a range of 40° to 50°.

3. The system according to claim 1 or 2, wherein the slanted surface (9) extends over the entire thickness of the flame bar (3) from its front side (8') to its back side (8) oriented towards the building wall or only over a partial thickness of the flame bar, wherein preferably at least one horizontally extending shoulder is provided in front and/or after the slanted surface (9).

4. The system according to one of the preceding claims, wherein the insulation plate (5) provided for contacting the upper face of the flame bar (3) is configured at its lower face complementary to the shape of the upper face of the flame bar (3).

5. The system according to one of the preceding claims, wherein comer elements (20) are provided for contacting the upper face of the flame bar (3), wherein the corner elements are formed as bridge members between the flame bar (3) and the insulation plate (5) arranged there above, and wherein the bridge members are formed from the insulation material of the insulating plates (4 - 6).

6. The system according to claim 5, wherein the lower face of the corner element (20) is adapted in a complementary manner to the upper face of the flame bar (3).

7. The system according to one of the preceding claims, where the thickness of the flame bar corresponds to the thickness of the insulating plates arranged on top and/or below it.

8. The system according to claim 8, wherein the face of the fire bar flushes with the face of the adjacent covering in the installed position.

9. The method for building a fagade insulation with the system according to one of the preceding claims, wherein at least a lower layer of insulation plates (4) is attached at the building wall (1), wherein a layer of flame bars (3) is arranged on the upper face of the insulation plates (4), wherein the flame bars are attached to the building wall and wherein the arrangement of the flame bar (3) is provided so that a face of the flame bar retains or collects insulation material that has molten under fire impact, and wherein at least one other layer of insulation plates (5, 6) is arranged above the flame bars (3).

10. A flame bar for a fagade covering made from insulation plates made from flammable thermoplastic material, in particular hard foam plates made from polystyrene, poly urethane and similar, in particular for use in a system according to one of the claims 1 - 8, wherein the flame bars (3) are provided with a face with features according to at least one of the claims 1 - 8.