A method for constructing a building wall and a building wall produced by such a method

Abstract

The invention relates to a method for producing a building wall. The method comprises a) constructing an inner core of a building wall comprising a layer of mineral wool insulation batts, fiberglass insulation batts, polymeric foam insulation batts, and / or cellulose fiber insulation batts (130); and b) applying, preferably spraying, a layer of a plaster composition comprising an adhesive (140) onto a portion of said layer of batts (130).

Description

[0001] A method for constructing a building wall and a building wall produced by such a method

[0002] Field of the Invention

[0003] The present invention relates to walls for buildings.

[0004] Background of the Invention

[0005] Many different materials, such as polymeric foams, mineral wool, cellulose fibres, and fiberglass, are known in the art to provide thermal insulation to wall systems. Some of these materials are inherently flammable and some lead to the melting and spread of burning debris. This may lead to sustaining combustion by progressive smouldering even after the actual flames have extinguished.

[0006] Hence, a building wall is to meet specific fire performance standards and may have to be constructed with fire-resistant protective surfaces, such as one-half inch gypsum board, applied over the insulation. However, it is difficult to provide an airtight protective surface of gypsum board around installations in the wall, such as around electrical outlets, and tubing. Furthermore, it is very timeconsuming to mount the gypsum boards.

[0007] Object of the Invention

[0008] The objective of the present invention is to provide a building wall solving at least some of the above problems.

[0009] This has been accomplished according to this invention by providing a plurality of beam members and positioning them with a predefined space between adjacent beam members, said beam members each having a front face, a rear face, and two side faces. Then a layer of mineral wool batts, fiberglass batts, and / or cellulose batts are placed into the spaces between adjacent beam members, and finally a layer of a plaster composition comprising an adhesive is sprayed or applied onto a portion of said layer of batts and preferably also onto a portion of said beam members. If needed, the layer of plaster composition is smoothened. The plaster composition is then allowed to cure or harden to form a plaster layer. Electrical outlets and tubing are completely sealed along their edges by the plaster composition, thereby improving the fire resistance compared to the use of traditional plaster boards, where holes must be made therein for installation of e.g., electrical outlets. Often these holes are made excessively large, thereby increasing the risk that fire can reach the insulation layer or e.g., beam members of wood or other inflammable materials.

[0010] Summary of the Invention

[0011] A first aspect relates to a method for producing a building wall, the method comprising: a) constructing an inner core of a building wall comprising a layer of mineral wool insulation batts, fiberglass insulation batts, polymeric foam insulation batts, and / or cellulose fiber insulation batts; and b) applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto a portion of said layer of batts.

[0012] The term “mineral wool” generally refers to fibers made from natural or synthetic minerals. Non-limiting examples of synthetic minerals are fiberglass or glass wool; ceramic fibers; and stone wool or rock wool. The terms “mineral wool”, “mineral fibers” may be used interchangeably.

[0013] In the context of the present disclosure, the term "polymeric foam" is meant to designate a material based on a polymer and which material comprises voids, typically in an amount of at least 5% by volume, typically from 10% to 55% by volume or from 10% to 45% by volume. The voids may be obtained by any of the known methods, such as cells formed by gas. Alternatively, the voids may result from the incorporation of hollow fillers, such as hollow polymeric particles, hollow glass microspheres or hollow ceramic microspheres. The term "insulation batt", as used herein, is defined to mean a sheet, block, or web of an insulation material.

[0014] In the present context, the terms “plaster” and “gypsum” are used interchangeably and meant to be understood as normally understood in the art, i.e., to cover compositions predominately made from calcium sulfate, preferably predominately comprising calcium sulfate hemihydrate but may also comprise calcium sulfate anhydrate, calcium sulfate dihydrate, as well as calcined gypsum.

[0015] In one or more embodiments, the plaster composition comprises an adhesive suitable for adherence to the layer of open and / or closed cell foam, and preferably also to wood.

[0016] In one or more embodiments, the plaster composition comprises an adhesive selected from the group consisting of: adhesives comprising an anionic copolymer dispersion of acrylic acid ester and styrene, polyvinyl acetate adhesives, polyvinyl alcohol adhesives, polyurethane adhesives, phenolic resin adhesives, cyanoacrylate adhesives, adhesives comprising an ethylene / vinyl acetate copolymer, adhesives comprising an ethylene-vinyl acetate-vinyl chloride emulsion, and mixtures thereof.

[0017] In one or more embodiments, the plaster composition comprises 6-15% by dry matter weight adhesive.

[0018] In one or more embodiments, the plaster composition comprises an adhesive in the form of a (water) redispersible polymer powder. Redispersible polymer powders are polymer emulsions, which have been converted by a series of process, such as high temperatures and pressures, spray drying and surface treatment, to powdered thermoplastic resin materials. When mixed with water, these powdered organic binders can redisperse in water back into new emulsions with essentially identical properties to the original copolymer emulsions.

[0019] In one or more embodiments, the plaster composition comprises a water-based adhesive formulation, such as water-based formulation, e.g., a water-based dispersion.

[0020] In one or more embodiments, step a) comprises the sub-steps of: a1 ) providing a plurality of beam members and positioning them with a predefined space between adjacent beam members, said beam members each having a front face, a rear face, and two side faces; and a2) placing a layer of mineral wool insulation batts, fiberglass insulation batts, polymeric foam insulation batts, and / or cellulose fiber insulation batts into the spaces between adjacent beam members.

[0021] In one or more embodiments, step b) further comprises applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto a portion of said beam members.

[0022] In one or more embodiments, step a) further comprises the sub-step of: a3) mounting a supporting net to the front and / or rear faces of said beam members and across said layer of batts, and wherein step b) further comprises applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto said supporting net.

[0023] In one or more embodiments, the beam members comprise wood, wood composite, metal, or combinations thereof.

[0024] In one or more embodiments, step a) comprises: a1) providing a plurality of beam members and positioning them with a predefined space between adjacent beam members, said beam members each having a front face, a rear face, and two side faces; and a2) providing one or more wall panels and fastening them to the front faces of said beam members to form a sheathing having an inner side and an outer side, said sheathing spanning the space between adjacent beam members and being attached to the beam members such that the inner side of the sheathing is in juxtaposition with the beam members.

[0025] In one or more embodiments, the wall panels defining the sheathing comprises wood, oriented strand board, fibrous cement, fiberglass reinforced gypsum, expanded polystyrene, extruded polystyrene, polyisocyanurate, foam board or combinations thereof.

[0026] In one or more embodiments, the beam members’ side face or side faces comprises a support section, such as one or more flanges or pins or spikes, adapted for holding said layer of batts into place.

[0027] In one or more embodiments, the beam members’ front and / or rear faces comprises a plurality of protrusions adapted for use as anchorage points within said layer of a plaster composition.

[0028] In one or more embodiments, step b) comprises: b1) mounting a guide rail of plaster, preferably by adhesion, onto the front and / or rear faces of at least two, preferably three or more, of said beam members; b2) spraying a layer of a plaster composition comprising an adhesive onto a portion of said layer of batts and preferably also onto a portion of said beam members; and b3) using said guide rails for controlling the thickness of said layer of plaster composition and / or for straightening said layer of plaster composition, and / or for smoothening said layer of plaster composition. In one or more embodiments, step b) comprises: b1) mounting a guide rail of plaster, preferably by adhesion, onto the front faces of said layer of batts; b2) spraying a layer of a plaster composition comprising an adhesive onto a portion of said layer of batts; and b3) using said guide rails for controlling the thickness of said layer of plaster composition and / or for straightening said layer of plaster composition, and / or for smoothening said layer of plaster composition.

[0029] In one or more embodiments, the method further comprises the step of: c4) allowing said plaster composition to irreversibly bind to said guide rails as it cures or harden.

[0030] In one or more embodiments, the layer of batts is of mineral wool insulation batts, and wherein the plaster composition comprises an adhesive suitable for adherence to the layer of mineral wool insulation batts, and preferably also to wood or metal.

[0031] In one or more embodiments, the layer of batts is of polymeric foam insulation batts, and wherein the plaster composition comprises an adhesive suitable for adherence to the layer of polymeric foam insulation batts, and preferably also to wood or metal.

[0032] In one or more embodiments, the layer of batts is of cellulose fiber insulation batts, and wherein the plaster composition comprises an adhesive suitable for adherence to the layer of cellulose fiber insulation batts, and preferably also to wood or metal.

[0033] A second aspect relates to a method for producing a building wall, the method comprising: a1) providing a plurality of beam members and positioning them with a predefined space between adjacent beam members, said beam members each having a front face, a rear face, and two side faces; a2) placing a layer of mineral wool insulation batts, fiberglass insulation batts, polymeric foam insulation batts, and / or cellulose fiber insulation batts into the spaces between adjacent beam members; and b) applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto a portion of said layer of stone wool batts and preferably also onto a portion of said beam members.

[0034] A third aspect relates to a building wall produced by any one of the methods of the present invention.

[0035] A fourth aspect relates to a building wall comprising:

[0036] - a plurality of spaced apart beam members;

[0037] - a sheathing having an inner side and an outer side, the sheathing spanning a space between adjacent beam members and being attached to the beam members such that the inner side of the sheathing is in juxtaposition with the beam members;

[0038] - a layer of mineral wool insulation batts, fiberglass insulation batts, and / or cellulose fiber insulation batts positioned within said space between adjacent beam members; and

[0039] - a layer of a plaster composition comprising an adhesive, said plaster layer adhering to a portion of said layer of batts and preferably also to a portion of said beam members; wherein said layer of batts comprises a first side and a second side, said first side facing said sheathing and said second side facing said plaster layer.

[0040] A fifth aspect relates to a building wall comprising:

[0041] - a plurality of spaced apart beam members;

[0042] - a layer of mineral wool insulation batts, fiberglass insulation batts, and / or cellulose fiber insulation batts positioned within said space between adjacent beam members; and

[0043] - a layer of a plaster composition comprising an adhesive, said plaster layer adhering to a portion of said layer of batts and preferably also to a portion of said beam members; wherein said layer of batts comprises a first side and a second side, said second side facing said plaster layer.

[0044] In one or more embodiments, a guide rail, preferably of plaster (could e.g., also be of metal or wood but is less preferable), is fastened to the rear face of at least two, preferably three or more, of said beam members, and wherein said guide rails are integrated into said plaster layer.

[0045] As used in the specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Ranges may be expressed herein as from "about" or "approximately" one particular value and / or to "about" or "approximately" another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent "about", it will be understood that the particular value forms another embodiment.

[0046] It should be noted that embodiments and features described in the context of one of the aspects of the present invention also apply to the other aspects of the invention.

[0047] The invention is described in more detail in the following detailed description of a preferred embodiment, with reference to the figures. Brief description of the figures

[0048] Figure 1 shows a rear view of a structural member of the wall according to the present invention.

[0049] Figure 2 shows a top view of a structural member of the wall according to the present invention.

[0050] Figures 3-5 each show a top view of a building wall according to the present invention.

[0051] Figure 6 shows a top view of a structural member of the wall according to the present invention, where the foam layer has been applied and aligned, and the guide rails mounted.

[0052] Figure 7 shows a top view of a structural member of the wall according to the present invention, where both the foam layer and the plaster layer has been applied.

[0053] Figure 8 shows a top view of a structural member of the wall according to the present invention, where both the foam layer and the plaster layer has been applied, and where a levelling tool (not shown) has been used to level the plater layer.

[0054] References

[0055] 110 Beam

[0056] 120 Sheet

[0057] 130 Insulation material

[0058] 140 Plaster layer

[0059] 150 Supporting net 160 Protrusion / guide rail

[0060] Detailed Description of the Invention

[0061] The invention is not limited to the embodiment(s) illustrated in the drawings. Accordingly, it should be understood that where features mentioned in the appended claims are followed by reference signs, such signs are included solely for the purpose of enhancing the intelligibility of the claims and are in no way limiting on the scope of the claims.

[0062] A structural member of the wall of the present invention is formed according to the configuration shown in FIG. 1 and FIG. 2. The size of the structural member is merely exemplary and is made by an array of five parallel 5x10 cm by 180 cm wood lumber beams 110 spaced apart by 35-40 cm. An oriented strand board (OSB) sheet 120 is fastened to the front faces of the wood lumber beams by screws. The oriented strand board (OSB) sheet 120 is only optional and can be omitted. After fastening of the OSB sheet 120, three different constructs were made as shown in FIG. 3-5. In FIG. 3, mineral wool batts were used (as the layer of insulation batts 130) to place within the spaces between adjacent beam members 110. The mineral wool batts are at its surface filled with cavities (pores) extending into the mineral wool layer. The inventors of the present invention have taken advantage of this structure as the cavities can be filled with the plaster composition that is subsequently sprayed onto a portion of said foam layer (as well as onto the rear faces of said beam members). This effect allows the formed plaster layer 140 to anchor into the mineral wool layer 130 (not shown in the figures).

[0063] The plaster composition is to the knowledge of the inventors not commercially available but can be made by addition of adhesive to a commercially available spray plaster, such as MP75 L from Knauf, or RED TOP® Gypsum Plaster from United States Gypsum Company. The adhesive can be added as powder or as a water-based formulation and mixed with the commercially available spray plaster. The water-based formulation may alternatively be continuously pumped into the wet plaster stream in the plaster machine. Commercially available spray plaster typically comprises hemihydrate gypsum and optionally multiphase gypsum (e.g., 80-99% w / w), and minor amounts of other aggregates, such as fillers (e.g., limestone, perlite, and silica), carbohydrates, accelerators, and retarders. The application of gypsum spray plaster composition may require different working phases from the projection of the gypsum composition onto a vertical wall until a spotless smooth surface is generated. Some of these steps may e.g., be spraying and the first even out process, paring of the surface, rough finishing, and one or more times of smooth finishing. The timing of these working phases may depend on the increasing strength of the plaster composition. An important quality criterion for gypsum plaster is a constant setting profile. The curing / hardening of the gypsum can have two different origins. One is the chemical hydration of the gypsum hemihydrate, and the second one is the loss of water to the absorbing substrate and to the atmosphere due to evaporation. Both processes run in parallel. The addition of a water retention agent, such as cellulose ether, provides water retention to the plaster and prevents loss of water to the absorbing substrate, here the foam and wood. The desired setting profile of gypsum plaster composition can be adjusted by selecting a composition of several different retarders and additional dosage of accelerators. Tartaric acid is widely used gypsum plaster compositions as it delays gypsum setting very effectively. Natural tartaric acid, finely milled (e.g., 100% below 63pm), is recommended. Malic acid delays less in comparison to tartaric acid. The time span between the start of the setting and finish is shorter than for tartaric acid. When the gypsum plaster composition is applied manually, malic acid is recommended (e.g., finely milled, preferably 100% below 63pm). The polyphosphate (Targon G2, BK Giulini GmbH) is in most cases used as an additional retarder as it specifically delays at the end of the setting process. All tree retarders are thought to have a delaying impact on the gypsum crystal nucleation. Tartaric acid is most effective at alkaline pH values greater than 12, why gypsum spray plaster compositions are often adjusted by the addition of hydrated lime. Calcium sulphate dihydrate is widely used to accelerate gypsum plaster composition. A typical calcium sulphate dihydrate accelerator is Casonic DH 50 / 45 (VG-Orth, Germany), with a very fine granulometry (80% < 20 pm), and a high specific surface area of 6000 cm2 / g. The calcium sulphate dihydrate particles functions as seed crystals during the gypsum setting process. The higher the number of fine particles, the better the accelerating effect will be. The addition of calcium sulphate dihydrate stabilizes the setting process. The setting profile without accelerator will appear very unstable.

[0064] In FIG. 4, XPS (extruded polystyrene) batts were used (as the layer of insulation batts 130) to place within the spaces between adjacent beam members 110. As the XPS batts are very difficult to cut, a part of the spaces between adjacent beam members 110 is left unfilled. The plaster composition is subsequently sprayed into the unfilled part of the spaces, onto a portion of the XPS layer (as well as onto the side and rear faces of said beam members). Cavities (not shown in the figures) could be cut, shaped (during production of such batts), or drilled into the XPS layer to provide cavities for the plaster composition to enter, thereby allowing the formed plaster layer 140 to anchor into the XPS layer 130.

[0065] In FIG. 5, mineral wool batts were used (as the layer of insulation batts 130) to place within the spaces between adjacent beam members 110. To further strengthen the plaster layer 140 and / or to hold the insulation batts 130 in place before the plaster composition is applied and the plaster layer 140 is formed, a supporting net 150 may be mounted to the front and / or rear faces (here only shown mounted to the rear faces) of the beam members 110 and across the layer of batts 130. Alternatively, or in combination, the beam members’ front and / or rear faces (here only shown mounted to the rear faces) may be provided with a plurality of protrusions 160 adapted for use as anchorage points within the plater layer 140. Here, the protrusions are shaped with a head extending to the sides relative to the main body of the protrusion. The protrusion 160 may e.g., be a bolt, a screw, or a nail fastened to the beam member 110. In a particularly preferred embodiment, the thickness of the plaster layer can be controlled by mounting a guide rail of plaster 160, preferably by adhesion, onto the rear and / or front faces (here only shown mounted to the rear faces) of the beam members 110, thereby forming a space between adjacent guide rails 160, as seen in FIG. 6. Then, a layer of a plaster composition is sprayed onto a portion of the layer of insulation batts 130, thereby filling the space between adjacent guide rails 150, as seen in FIG. 7. As can be seen, the sprayed layer 140 is uneven and with differing thickness. The guide rails are used to guide a levelling tool (not shown) to provide an even plaster layer, as seen in FIG. 8. Furthermore, as the guide rails are made of plaster, the plaster composition will bind thereto to form a uniform surface. The guide rails 160 may be provided with an adhesive tape for attachment to the rear face of the beam members 110.

[0066] EXAMPLE 1 - TEST OF ADHESIVES

[0067] This example tests the adhesive effect of spray plaster compositions with different types of adhesives at two different concentrations, i.e., 5% w / w and 10% w / w (dry weight) mixed with a commercial spray plaster, i.e., MP75 L from Knauf. The mixture was subsequently mixed with water and applied to three types of surfaces, i.e., wood (pine wood), mineral wool batts, and XPS (extruded polystyrene) batts. The samples were left to cure or harden.

[0068] The six selected adhesives were Selvol™ Polyvinyl Alcohol 205S (polyvinyl alcohol) from Sekisui Specialty Chemicals America, LLC, Wood Adhesive 730 Outdoor (Polyvinyl acetate) from Bostik A / S, Acronal® S 430 P (redispersible polymer powder based on an aqueous, plasticizer-free, anionic copolymer dispersion of acrylic acid ester and styrene) from BASF SE, and Acronal® 5018 (aqueous dispersion of acrylic acid ester and styrene copolymer, 50% w / w solid in water), Dermulsene 222 from DRT (a solvent-free water-based dispersion formulated with terpene resin and stabilized rosin ester, 50% w / w solid in water), and Dermulsene TR 602 (a solvent-free formulated with terpene phenolic resin, 50% w / w solid in water). At 5% w / w (dry weight) concentrations, none of the adhesives showed good adhesion to any of the three types of surfaces. At 10% w / w (dry weight) concentrations, all six types of adhesives showed good adhesion to the mineral wool and XPS batts, but the Dermulsene 222 and Dermulsene TR 602 samples failed to adhere to wood. Hence, the compositions with 10% w / w (dry weight) concentrations of the first four adhesives were selected for further testing.

[0069] EXAMPLE 2 - TEST OF ADHESIVES

[0070] This example tests the durability of spray plaster compositions with different types of adhesives.

[0071] Eight structural members were made. Eight wood lumber beam square frames were initially made from four 5x10 cm wood lumber beams spaced apart by 35 cm. The length and width of the frame was 180 cm. An oriented strand board (OSB) was fastened to the front faces of the wood lumber beams by screws. After fastening, the space within the frame was filled with either mineral wool insulation batts (four of them) or XPS (extruded polystyrene) insulation batts (four of them). The eight insulation material filled frames were sprayed with 1 inch of a spray plaster composition with different types of adhesives, i.e., with 10% w / w (dry weight) concentration of Selvol™ Polyvinyl Alcohol 205S (polyvinyl alcohol) from Sekisui Specialty Chemicals America, LLC, Wood Adhesive 730 Outdoor (Polyvinyl acetate) from Bostik A / S, Acronal® S 430 P (redispersible polymer powder based on an aqueous, plasticizer-free, anionic copolymer dispersion of acrylic acid ester and styrene) from BASF SE, and Acronal® 5018 (aqueous dispersion of acrylic acid ester and styrene copolymer, 50% w / w solid in water), respectively. The samples were then allowed to cure and harden to form a plaster layer. Then the samples were then placed in a climate cabinet for 120 hours. The temperature cycles were 5 degrees Celsius for 24 hours, 40 degrees Celsius for 24 hours, 5 degrees Celsius for 24 hours, 40 degrees Celsius for 24 hours, and finally 5 degrees Celsius for 24 hours. At 5 degrees Celsius, the humidity was kept at 50-80%, and at 40 degrees Celsius, the humidity was kept at about 90%. No cracks were observed in the plaster layer of any of the samples. The plaster layer of any of the samples adhered very tight to both the insulation material and the wood parts. The best adherence was observed for the spray plaster compositions with 10% w / w (dry weight) concentration of Wood Adhesive 730 Outdoor and Acronal® 5018.

Claims

Claims1 . A method for producing a building wall, the method comprising: a) constructing an inner core of a building wall comprising a layer of mineral wool insulation batts, fiberglass insulation batts, polymeric foam insulation batts, and / or cellulose fiber insulation batts; and b) applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto a portion of said layer of batts.

2. The method according to claim 1 , wherein step a) comprises the sub-steps of: a1) providing a plurality of beam members and positioning them with a predefined space between adjacent beam members, said beam members each having a front face, a rear face, and two side faces; and a2) placing a layer of mineral wool insulation batts, fiberglass insulation batts, polymeric foam insulation batts, and / or cellulose fiber insulation batts into the spaces between adjacent beam members.

3. The method according to claim 2, wherein step b) further comprises applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto a portion of said beam members.

4. The method according to any one of the claims 2-3, wherein step a) further comprises the sub-step of: a3) mounting a supporting net to the front and / or rear faces of said beam members and across said layer of batts, and wherein step b) further comprises applying, preferably spraying, a layer of a plaster composition comprising an adhesive onto said supporting net.

5. The method according to any one of the claims 2-4, wherein said beam members’ side face or side faces comprises a support section, such as one or more flanges or pins or spikes, adapted for holding said layer of batts into place.

6. The method according to any one of the claims 2-4, wherein said beam members’ front and / or rear faces comprises a plurality of protrusions adapted for use as anchorage points within said layer of a plaster composition.

7. The method according to any one of the claims 2-5, wherein step b) comprises: b1) mounting a guide rail of plaster, preferably by adhesion, onto the front and / or rear faces of at least two, preferably three or more, of said beam members; b2) spraying a layer of a plaster composition comprising an adhesive onto a portion of said layer of batts and preferably also onto a portion of said beam members; and b3) using said guide rails for controlling the thickness of said layer of plaster composition and / or for straightening said layer of plaster composition, and / or for smoothening said layer of plaster composition.

8. The method according to any one of the claims 1 -6, wherein step b) comprises: b1) mounting a guide rail of plaster, preferably by adhesion, onto the front faces of said layer of batts; b2) spraying a layer of a plaster composition comprising an adhesive onto a portion of said layer of batts; and b3) using said guide rails for controlling the thickness of said layer of plaster composition and / or for straightening said layer of plaster composition, and / or for smoothening said layer of plaster composition.

9. The method according to any one of the claims 6-7, further comprising the step of: c4) allowing said plaster composition to irreversibly bind to said guide rails as it cures or harden.

10. The method according to any one of the claims 1 -8, wherein said layer of batts is of mineral wool insulation batts, and wherein the plaster composition comprises an adhesive suitable for adherence to the layer of mineral wool insulation batts, and preferably also to wood or metal.11 . The method according to any one of the claims 1 -8, wherein said layer of batts is of polymeric foam insulation batts, and wherein the plaster composition comprises an adhesive suitable for adherence to the layer of polymeric foam insulation batts, and preferably also to wood or metal.

12. The method according to any one of the claims 1 -8, wherein said layer of batts is of cellulose fiber insulation batts, and wherein the plaster composition comprises an adhesive suitable for adherence to the layer of cellulose fiber insulation batts, and preferably also to wood or metal.

13. The method according to any one of the claims 1 -8, wherein the plaster composition comprises an adhesive selected from the group consisting of: adhesives comprising an anionic copolymer dispersion of acrylic acid ester and styrene, polyvinyl acetate adhesives, polyvinyl alcohol adhesives, polyurethane adhesives, phenolic resin adhesives, cyanoacrylate adhesives, adhesives comprising an ethylene / vinyl acetate copolymer, adhesives comprising an ethylene-vinyl acetate-vinyl chloride emulsion, and mixtures thereof.

14. The method according to any one of the claims 1 -12, wherein the plaster composition comprises 6-15% by dry matter weight adhesive.

15. A building wall produced by the method of any one of the claims 1 -13.

16. A building wall comprising:- a plurality of spaced apart beam members;- a layer of mineral wool insulation batts, fiberglass insulation batts, and / orcellulose fiber insulation batts positioned within said space between adjacent beam members; and- a layer of a plaster composition comprising an adhesive, said plaster layer adhering to a portion of said layer of batts and preferably also to a portion of said beam members; wherein said layer of batts comprises a first side and a second side, said second side facing said plaster layer.

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