Insulating element for thermal and / or acoustic insulation of flat or flat-sloped roofs and method for producing the insulating element

Abstract

An insulating element (4) for thermal and / or acoustic insulation of a flat roof (1), comprising a first layer (5) made of mineral wool and a second layer (6) made of at least one fabric, the second layer (6) being fixed to a main surface (7) of the first layer (5) by means of an adhesive (9), the first layer (5) being made of at least one lamina having fibers oriented mostly perpendicular to a main surface (8) of the second layer (6), the first layer (5) containing a solidified binder, the adhesive (9) being fixed to the first layer (5) facing the second layer (8). an insulating element (4) in which the adhesive (9) is partially disposed in an area (10) between the fibers near the main surface (7) of the first layer (5) and in an area (11) near the main surface (8) of the second layer (8) directed toward the first layer (5), whereby the adhesive (9) connects the first layer (5) and the second layer (6) such that a force directed perpendicular to the second layer (6) can be complemented by the tensile strength of the second layer (8) combined with the strain of the fibers in the adhesive (9) and / or the first layer (5), resulting in a maximum deformation of less than 5% of the thickness of the first and second layers (5).

Description

[Technical Field]

[0001] The present invention relates to an insulating element for thermal and / or acoustic insulation of flat or flat-sloped roofs. The insulating element comprises a first layer made of mineral wool, particularly stone wool, and a second layer made of at least one fabric, particularly fleece. The second layer is fixed to the main surface of the first layer by adhesive. The first layer is made of at least one mineral wool laminar element having fibers oriented mostly perpendicular to its main surface. Furthermore, the first layer contains a solidified binder. The present invention also relates to a method for producing the insulating element described above. [Background technology]

[0002] Flat roofs and flat-sloped roofs are known in the prior art. For example, membrane roof systems are generally divided into the following types depending on the location of the body insulation: warm roof, inverted warm roof, roof garden or green roof, and cold roof.

[0003] Membrane roof systems are used to protect flat or flat-sloped roofs from all weather conditions they will be subjected to over their design life. They are often constructed as single-ply roof systems, especially for larger roofs, or they are constructed with bituminous membranes, specifically reinforced bituminous membranes (RBMs). Bituminous membranes are typically applied as two or more layers of sheet material stretched over thermal and / or acoustical insulation elements. A typical membrane roof system includes a structural support, a floor providing continuous support, such as a steel or concrete floor, a vapor control layer (if required), insulation (if required), a waterproof membrane, and a traffic- or load-resistant finish (if required for functional and / or aesthetic reasons).

[0004] This invention is primarily aimed at so-called warm roofs, where the primary insulation is placed directly beneath the roof covering or waterproofing membrane. The three main options for mounting single-ply roof systems are mechanical fastening, adhesive / thermal bonding / cold adhesive, and ballasting, by which the insulation and membrane can be mounted, or they can be mounted differently. Preferably, a single-ply waterproofing membrane or waterproofing lining is attached to the substrate or insulating layer by cold adhesive using a suitable cold adhesive. Meanwhile, reinforced bituminous membranes (RBMs) are commonly applied by the torch method. In this method, a specially designed bituminous membrane is heated from its bottom side with a gas torch to liquefy some of the bitumen, eliminating the need for a separate adhesive or adhesive. The torch method requires special measures and fire precautions and is not suitable for use on or near flammable materials.

[0005] Mineral wool insulation elements for thermal and / or acoustic insulation of flat or flat-sloped roofs are known in the art, with respective product and overall requirements specified in European Standard EN 13162:2012+A1:2015 "Thermal insulation products for buildings - Factory made mineral wool (MW) products".

[0006] These mineral wool insulating elements, or respective products, are typically rated at 150 kg / m² to provide mechanical resistance for use on flat or flat-sloped roof systems. 3 Larger than 250kg / m 3These mineral wool insulation elements comprise relatively high-density, layered or corrugated products up to 1000 psi. Their fiber orientation is mostly layered relative to the main surface of the element, or somewhat tortuous as a result of compression in the longitudinal direction of the primary web before solidification. Such mineral wool insulation elements in board form become quite heavy, increasing the thermal requirements and thus the thickness of the product. Therefore, in many instances, two layers of insulation elements are required to meet local building codes for thermal performance. Insulating with two insulating layers is time-consuming and labor-intensive. On the other hand, boards with higher bulk densities need to be smaller and / or thinner to be handled by one person.

[0007] So-called thin-layer products are known in other building insulation applications, particularly in facade insulation segments, especially in composite systems for external thermal insulation. These products are manufactured from board-type layered pre-finished products, in which slices are cut and then rotated 90° so that the resulting insulating elements have fibers oriented mostly perpendicular to the main surface. However, these thin-layer products are sensitive to forces applied parallel to the orientation of the majority of their fibers, i.e., compressive forces or loads. This is one reason why thin-layer products are not commonly used on flat or flat-sloped roofs. When thin-layer products are used for insulating the respective roofs, they must be covered with a load-distributing layer, such as an additional high-density mineral wool cover board or other sheet-like material, such as a wood-based building board. The additional insulating or load-distributing layer covering is time-consuming and labor-intensive.

[0008] Recent efforts have begun to broaden the scope of application for overlapping or corrugated roofing products, including the application of waterproofing layers. For example, see EP 2753770, which describes an insulating element for thermal and / or acoustic insulation of flat or flat-sloped roofs, comprising a first layer made of mineral fibers, particularly stone wool fibers, and a second layer made of at least one fabric, particularly an impregnated fleece. The second layer is fixed to the main surface of the first layer by adhesive, and the second layer is impregnated with an inorganic filler, particularly lime. The second layer, combined with the filler, is thus permeable, allowing hot air gas to penetrate the second layer and closing it off for penetration of the adhesive or adhesive toward the first layer. Each product has proven suitable for bonding / cold-adhesion of waterproofing membranes, and, due to the inorganic impregnation of the second layer, is also suitable for torch-spraying, for example, bituminous membranes. However, the resulting products are heavy, their thickness range is limited, and a special fleece is required for the second layer, which increases production costs.

[0009] One of the main aspects of such flat or flat-sloped roofs in use is the possibility of accessing and walking on at least a portion of the roof, particularly without damaging the waterproofing membrane and insulating elements. Therefore, the corresponding support of the waterproofing membrane from the insulating elements and their respective mechanical resistance must give a person walking on such a roof the impression that the top component of the supporting floor will not bend or collapse. Roofs can be classified according to their accessibility. Accordingly, roofs requiring special equipment for access for maintenance purposes are distinct from roofs accessible only for maintenance purposes; roofs accessible for frequent maintenance of equipment installed on the roof; roofs accessible for pedestrian traffic; roofs accessible for light vehicles; roofs accessible for heavy vehicles; and roof gardens. In the context of this invention, we only cover roofs that function when exposed to mechanical stresses associated with a compressive test load of 40 kPa to 80 kPa and specific temperatures up to 80°C. Such roofs can be used when accessible for pedestrian traffic and frequent maintenance of equipment is expected. Furthermore, roofs that can be test loaded at higher loads are accessible for light vehicles and can only be used if the waterproof coating is protected by a concrete pavement or the like. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] European Patent No. 2753770 Summary of the Invention [Problem to be solved by the invention]

[0011] The goal of the present invention is to improve the mechanical properties of thin mineral wool insulating elements, preferably with respect to the stability of the insulating element under distributed static loads. This is particularly relevant for walkability on roofs accessible for pedestrian traffic and / or light vehicles, in that the components at the top of the floor provide continuous support and only bend or collapse at very small intervals. Furthermore, the goal of the present invention is to provide a thin mineral wool insulating element that is lightweight yet mechanically strong, easy to handle, can be quickly applied, and has only one layer, even at large thicknesses.

[0012] A further goal is to provide a method for producing such insulating elements that allows them to be produced at low cost and that allows for improved mechanical properties with regard to walking performance, especially in roofs accessible for pedestrian traffic and / or light vehicles. [Means for solving the problem]

[0013] According to the present invention, the solution for mineral wool insulating elements is that adhesive is partially placed in the area between the fibers of the first layer near the main surface facing the second layer and in the area near the main surface of the second layer facing the first layer, thereby connecting the first and second layers in such a way that forces directed perpendicular to the second layer are complemented by the tensile strength of the second layer combined with the strain of the adhesive and / or the fibers of the first layer, resulting in improved walkability. The maximum strain in each case is less than 5% of the thickness of the insulating element. Therefore, the adhesive is placed between the first and second layers at a density of 60 to 400 g / m. 2 , preferably 100 to 250 g / m 2 , more preferably 150 g / m 2 Served in amounts of.

[0014] The insulating element according to the present invention thus comprises a first layer in the form of a mineral wool lamina element made of mineral fibers and a solidified binder. A second layer made of a fabric, particularly a fleece, is fixed to the main surface of the lamina with an adhesive. The adhesive can be applied to the surface of the lamina and / or the fabric. The adhesive can also act within the lamina and / or the fleece. The adhesive is thereby arranged between the fibers of the lamina and between portions of the fabric, such that forces directed perpendicular to the second layer are complemented by the tensile strength of the second layer combined with the strain of the adhesive and / or fibers in the first layer, resulting in very limited deformation and increased point load capacity of the insulating element. This results in improved walkability, with a maximum deformation of less than 5% of the thickness of the insulating element, respectively. This maximum deformation is a result, on the one hand, of the fiber orientation and the use of a suitable adhesive, and, on the other hand, of the use of the second layer in particular. The second layer is made of at least one fabric connected to the lamina with the adhesive. The adhesive is applied between the fibers of the lamina, forming an area where most of the porous structure of the lamina is closed by the adhesive. This allows up to 90% of the pore volume in this area to be filled with adhesive. As a result, the adhesive also builds a closed layer in this area, which can resist longitudinal forces perpendicular to the orientation of the lamina fibers. On the other hand, the adhesive also penetrates into the porous structure near the surface of the fabric, building a mostly closed layer in the fabric with the same properties as the upper area of ​​the lamina.

[0015] The amount of adhesive according to the invention has been found to build up sufficient strength of the insulating element, in particular sufficient tensile strength of the adhesive, so that the insulating properties, in particular the thermal insulating properties, are not reduced in an amount such that thicker insulating elements would need to be used to meet all the requirements of insulating properties in the roof.

[0016] Thus, preferably, the adhesive forms a nearly closed layer connecting the fibers to each other and to the fabric components. The adhesive layer has sufficient tensile strength, which is supported by the connection to the fibers and fabric components of the first layer, so that forces applied perpendicular to the surface of the insulating element, for example by someone walking on the roof, are at least partially compensated for by the tensile strength of the adhesive and / or the second layer combined with the strain of the fibers in the first layer that are at least partially surrounded by the adhesive.

[0017] Preferably, the second layer is connectable to the bituminous membrane by torching or cold-adhesive, so that these insulating elements are useful for many different roof insulation applications.

[0018] According to another aspect of the invention, the adhesive is preferably selected from melamine urea formaldehyde as a two-component adhesive, water-based acrylic adhesive, phenol formaldehyde powder binder, water-based neoprene foam adhesive, polyamide powder adhesive, polyurethane adhesive as a two-component adhesive, polyurethane moisture-setting adhesive, or seal repair binder as a one-component moisture-setting adhesive. All these adhesives are able to establish a good connection to the mineral fibers and to establish an almost closed layer in the lamina area as well as in the fabric area, thereby strengthening the insulating element in the direction parallel to the major surface of the lamina.

[0019] The adhesive is 60 to 400 g / m between the first layer and the second layer. 2 , preferably 100 to 250 g / m 2 , more preferably 150 g / m 2 Served in amounts of.

[0020] It should be understood that, as defined above, the amount of adhesive provided between the first and second layers may be either wet-applied or dry-applied, depending on the type of adhesive selected. By way of example, two different standards are mentioned below.

[0021] For example, in the case of wet-applied adhesives such as water-based acrylic adhesives, the adhesive is generally 150 g / m 2 This is applied at a dry weight (after drying / setting) of approximately 90 g / m 2 Therefore, the dilution of such adhesives for application by commonly known wet application methods is typically about 60% dry matter to liquid, which in a similar manner corresponds to the aqueous neoprene foam adhesives listed above, although the dilution range may differ.

[0022] For dry-applied adhesives, such as phenol-formaldehyde powder binders or polyamide-based powder adhesives, the amount applied is meant to define a dry mass that remains substantially unchanged upon subsequent drying or solidification. Therefore, the amount is usually in the lower range of the ranges defined above, i.e., 60 to 250 g / m. 2 , preferably 80 to 150 g / m 2 It is said to be the amount of

[0023] The adhesive is provided all over between the first and second layers, giving a very strong connection between the layers and creating two almost perfect layers in the two areas of the first and second layers filled with adhesive. The advantage of this embodiment is that even though the adhesive is only provided in thin layers in the areas, the tensile strength of these layers is sufficient to limit the maximum deformation of the insulating element when loaded by a person with a standard weight of 80 kg walking on the roof or by forces generated by pedestrian traffic and / or light vehicles.

[0024] The peel strength of the second layer is an important characteristic to consider when creating each insulating element, both as a criterion for a strong bond between the layers and to ensure a sufficient bond. The peel strength, or peel strength, is a key criterion for the strength of the connection between the insulating element and the second layer, such as a glass fleece. In other words, the adhesion of the respective glass fleece on mineral wool boards, especially roof boards, is crucial. Once installed, such roof boards must be able to withstand wind impacts. Peel strength is tested internally and indicates the peel strength a product will experience when bonded to a waterproof covering or lining element. To test the peel strength, the second layer, acting as the top layer, is removed from the insulating element. The cross-sectional area of ​​the adhesive connection is selected to be one-third of the sample area. The peel strength is measured perpendicular to the surface of the insulating element bonded to the glass fleece along the length of the insulating element, with the aid of an additional self-adhesive lining element, which transfers the load of the glass fleece, which cannot withstand the applied force. First, the test specimens are positioned or fixed on guide rails so that the bitumen membrane can be peeled off vertically. The insulating elements are held in place vertically by the aforementioned guide rails. These guide rails are positioned on the lower traverse of a commercially available ZwickRoell material testing machine, for example. However, the guide rails ensure that the specimens can move horizontally and that no additional shear forces are introduced during the test. One end of each bitumen membrane is clamped to a fixture on the upper traverse and equipped with a load cell. The peel strength for a given length is determined. The dimensions of the test specimens are selected: 350 mm long and 150 mm wide for the insulating elements, and 450 mm long and 50 mm wide for the lining elements. A preload of 2.5 ± 0.25 N is applied, and the lining element with the glass fleece is pulled off the insulating element at a test speed of 100 ± 5 mm / min. This gives the peel strength measured in (N / 50 mm).Preferably, the thermal and / or acoustic insulation elements used in the insulation of flat or flat-sloped roofs provide a peel strength in the direction perpendicular to the main surface of the insulation element of at least 7.5 (N / 50 mm), preferably at least 10 (N / 50 mm).

[0025] According to another embodiment of the invention, a layer made of mineral fibers and binder, preferably in an amount of 3 to 7% by weight, has a thermal conductivity of 80 to 120 kg / m 2 as measured according to European standard EN 826:2013. 3 and a compressive strength of 50 to 130 kPa.

[0026] A further improvement of the insulating element according to the invention is realized in that the second layer is made of glass fleece, which preferably has an elastic modulus of 450 to 900 MPa, preferably 500 to 800 MPa, and / or a tensile strength of 50 to 110 N, preferably 70 to 90 N, according to European Standard EN ISO 1924-2:2009. Such an insulating element can be used on flat or flat-sloped roofs and can be loaded by people walking on the roof with limited distortion and good walkability, or even by light vehicles, without the surface distorting by more than 5% of the thickness of the insulating element.

[0027] Finally, according to another embodiment of the invention, the adhesive is provided with an inorganic filler, which may be represented by lime, which has the advantage that the fire resistance of the insulating element is increased and that such a filler further improves the point load characteristics due to the presence and load distribution properties of the glass fiber fleece.

[0028] The insulating element according to the invention offers superior mechanical properties, in particular improved walkability, compared to a comparable panel having only one layer of texture across its surface.

[0029] The objective of the method for producing an insulating element according to the present invention is achieved by connecting a first layer, made of at least one mineral wool thin layer and consisting of mineral fibers and a solidified binder, with a second layer, with fibers oriented mostly perpendicular to the main surface. The adhesive is partially disposed in the areas between the fibers of the first layer near the main surface of the first layer facing the second layer and in the areas near the main surface of the second layer facing the first layer, thereby connecting the first and second layers such that a force oriented perpendicular to the second layer is complemented by the tensile strength of the second layer combined with the strain of the adhesive and / or fibers in the first layer, resulting in improved walkability, with a maximum deformation of less than 5% of the thickness of the insulating element, respectively. The adhesive is applied to the first and / or second layer before connecting the two layers. When connecting the two layers, the adhesive penetrates into the pores in the first and / or second layer, where it solidifies after connecting the layers. This penetration can be facilitated by pressing the two layers together or by applying a mechanical force to the adhesive prior to joining the two layers.

[0030] Tests to evaluate the maximum deformation and behavior of insulating elements when subjected to mechanical stress at a specific temperature are conducted on a representative number of 300 x 300 mm insulating element samples. The test consists of maintaining the specimen at, for example, 80°C and measuring the deformation in a controlled atmosphere while a test load of 40 kPa or 80 kPa is held in place. The initial thickness of the specimen is first determined at a temperature of 23°C and a pressure of 1 kPa distributed over the entire area, after which the test load is applied. The test load is maintained at an elevated temperature of 80°C for 7 days. Frequent measurements of the sample thickness allow for deformation to occur during the test period. After the full 7 days, the sample's stable thickness is finally measured, and the final average deformation is calculated based on the initial and final thicknesses. The maximum relative deformation is limited to 5% of the insulating element's initial thickness.

[0031] The invention is illustrated in the accompanying figures. [Brief explanation of the drawings]

[0032] [Figure 1] FIG. 1 is a cross-sectional view of a portion of a flat roof. [Figure 2] 1 is a diagram illustrating point loads in a first embodiment of an isolation element. [Figure 3] 3 is a diagram showing the work amount of a point load in the first embodiment of the present invention according to FIG. 2; [Figure 4] 10 is a diagram illustrating point loads in a second embodiment of an isolation element. [Figure 5] 5 is a diagram showing the work amount of a point load in the second embodiment of the present invention according to FIG. 4; DETAILED DESCRIPTION OF THE INVENTION

[0033] Figure 1 shows a part of a flat roof 1 with a structural support 2, a vapor control layer 3 and an insulating element 4. The insulating element 4 comprises a first layer 5 with stone wool fibres and a binder and a second layer 6 made of glass fleece fabric with an elastic modulus of 573 MPa. The tensile strength of the glass fleece is 71 N.

[0034] The first layer 5 is represented by one or more lamina with fibers oriented mostly perpendicular to the main surface 7 of the second layer 6. The lamina, and therefore the first layer 5, has a density of 110 kg / m 3 and a typical thickness of 150 mm. The mineral fibres are bonded together via a binder which is hardened in a curing oven before the second layer 6 is fixed to the surface 8 of the first layer 5 via adhesive 9.

[0035] The adhesive 9 is partially disposed in an area 10 near the main surface 8 of the first layer 5 facing the second layer 6 and in an area 11 near the main surface 7 of the second layer 6 facing the first layer 5. The adhesive 9 thereby connects the first layer 5 and the second layer 6 so that a force directed perpendicular to the second layer 6 can be compensated for by the tensile strength of the second layer 6 combined with the strain of the adhesive 9 and / or the fibers in the first layer 5. A force of, for example, 80 kPa directed perpendicular to the second layer 6 causes a limited deformation of the insulating element 4 (first and second layers 5, 6) of less than 5%, thus a deformation of 7.5 mm or less for a 150 mm thickness of the first layer 5. The thickness of the second layer 6 is generally 1 mm or less and can therefore be ignored in this calculation. A sufficient amount of adhesive 9 is disposed between the fibers of the first layer 5, thereby creating a layer of adhesive 9 that surrounds the fibers and is fixed to the first layer 5.

[0036] The adhesive 9 is an acrylic adhesive and is applied between the two layers 5 and 6 at a density of 80 g / m 2 A sufficient amount of adhesive 9 is spread on the first layer 5 and the second layer 6. The adhesive 9 thereby forms a layer connecting the first layer 5 and the second layer 6 and is fixed to both layers 5, 6.

[0037] 2 shows a diagram with two graphs, the lower graph (dotted line) is the load versus deformation relationship for a thin layer known in the prior art, and the upper graph shows the load versus deformation relationship for an insulating element 4 according to the invention.

[0038] The density of the thin layer of mineral wool in the insulating element 4 according to the invention is 110 kg / m 3 The second layer 6 has a tensile strength of 71 N and an elastic modulus of 573 MPa. Both layers 5, 6 have a tensile strength of 80 g / m 2 The connection is made via an acrylic adhesive in an amount of 1000 ppm.

[0039] As can be seen from the upper graph, the point load strength of the insulating element 4 is significantly improved by the second layer 6 in combination with the layer of adhesive 9. In the small deformation range of 0-1.5 mm, both elements (thin layer and insulating element according to the invention) show elastic properties, but the insulating element according to the invention shows a higher load, which means that this insulating element has a higher elastic modulus compared to thin layers known from the prior art.

[0040] In the range of 1.5 to 12 mm, the insulating element 4 according to the invention is stronger than the thin layers known from the prior art. These improvements in point load strength, especially at small deformations, can also be seen as improved walkability.

[0041] 3 is a second diagram of the insulating element 4 described above, showing the work [j] of the point load against the deformation. Here again, the upper graph belongs to the insulating element 4 of the invention, and the lower graph (dotted line) belongs to a thin layer according to the prior art.

[0042] The present invention demonstrates that the walkability of an insulating element 4 is related to the product of the load and deformation that occurs when a person walks on the insulating element 4. Each load can be described as a force and a deformation as a displacement.

[0043] The product of the point load and deformation is the work done according to the general formula: Work volume = force x displacement

[0044] A larger work load means better walkability. This is especially important for deformations in the range of 0-10 mm or point loads up to 800 N. In the graph according to Figure 3 (dotted line), the work load of the same lamina as in the previous graph in Figure 2 is shown.

[0045] As can be seen from the graph for the insulating element 4 according to the invention, the work is about 25% greater after a deformation of 5 mm and about 80% greater after a deformation of 10 mm, which significantly improves the walkability.

[0046] Such results are shown in Figures 4 and 5. 3 This can also be achieved using a thin layer with a density of 0.1 mm. All other parameters are equal to those of FIGS.

[0047] Point load measurements are carried out in accordance with European standard EN12430:2013 "Thermal insulating products for building applications - Determination of behavior under point load". [Explanation of symbols]

[0048] 1 Roof 2 Support part 3. Vapor Control Layer 4. Insulation elements 5 layers 6 layers 7 surface 8 surface 9. Adhesive 10 areas 11 areas

Claims

1. An insulating element for thermal and / or acoustic insulation of flat or flat-sloped roofs, comprising a first layer made of mineral wool and a second layer made of at least one fabric, said second layer being fixed to a main surface of said first layer by means of adhesive, the first layer is made of at least one lamina having fibers oriented predominantly perpendicular to a major surface of the second layer; The insulating element is The adhesive is partially disposed in regions between fibers near the major surface of the first layer facing the second layer and in regions near the major surface of the second layer facing the first layer, forming regions in which most of the porous structure of the laminar surface of the first layer is closed by the adhesive, whereby the adhesive connects the first and second layers such that forces directed perpendicular to the second layer can be complemented by the tensile strength of the second layer combined with the strain of the adhesive and / or the fibers in the first layer, resulting in a maximum deformation of 5% or less of the thickness of the first and second layers, whereby the adhesive provides a strength between the first and second layers of 60 to 400 g / m ２ and the first layer made of mineral fibres and binder has a weight capacity of 80 to 120 kg / m, measured according to European Standard EN 826:2013. ３ and a compressive strength of 50 to 130 kPa.

2. 2. An insulating element according to claim 1, characterized in that the second layer is made of glass fleece and has an elastic modulus of 450-900 MPa and / or a tensile strength of 50-110 N.

3. 2. An insulating element according to claim 1, characterized in that the second layer can be connected to the bituminous membrane by torching or by cold adhesion.

4. 3. The insulating element according to claim 1, wherein the adhesive is selected from the group consisting of two-component adhesives melamine urea formaldehyde, water-based acrylic adhesives, phenol formaldehyde powder binders, water-based neoprene foam adhesives, polyamide-based powder adhesives, polyurethane moisture-setting adhesives, and silane-based repair binders.

5. The adhesive is a dry-applied adhesive or a polyamide-based powder adhesive, and the adhesive is applied between the first layer and the second layer at a density of 60 to 250 g / m ２ 5. An insulating element according to claim 1, wherein the insulating element is arranged in an amount of 0.1 to 0.5 wt.

6. Insulating element according to any one of claims 1 to 5, characterized in that the adhesive is provided over the entire surface between the first layer and the second layer.

7. The first layer is made of mineral fibers and a binder, and the binder has a density of 80 to 120 kg / m ３ The insulating element according to any one of claims 1 to 6, characterized in that it has a volume density of Basic.

8. A method for producing an insulating element according to any one of claims 1 to 7, comprising the steps of: A first layer made of at least one thin layer having fibers oriented mostly perpendicular to a major surface and having a solidified binder is connected to a second layer by an adhesive, the adhesive being partially disposed in areas between the fibers of the first layer near the major surface thereof oriented toward the second layer and in areas near the major surface thereof oriented toward the first layer, whereby the adhesive connects the first and second layers such that a force directed perpendicular to the second layer can be complemented by the tensile strength of the second layer combined with strain of the adhesive and / or the fibers in the first layer, resulting in a maximum deformation of 5% or less of the thickness of the first and second layers, the adhesive being applied before connecting the two layers and allowing the adhesive to solidify, and the adhesive having a strength of 60 to 400 g / m between the first and second layers. ２ The method of claim 1, wherein the amount of

9. 9. The method of claim 8, wherein the adhesive is disposed on the major surface of the first and / or second layer before the second layer is disposed on the first layer, thereby forcing the adhesive into pores in the first and / or second layer and allowing the adhesive to harden after connecting the layers.

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