Construction sheeting

Abstract

The invention relates to construction sheeting (1) comprising a multi-layer composite material (2) having a reinforcement layer (3) and a membrane layer (4), the membrane layer (4) being formed by at least one polymer selected from a group including fluoropolymers and thermoplastic polyurethanes, and the reinforcement layer (3) being formed by a fiber structure consisting of a fiber material.

Description

[0001] Title: Construction Film The invention relates to a construction film, in particular an underlayment, comprising a multi-layer composite material with a reinforcement layer and a membrane layer. Furthermore, the invention relates to a method for producing a construction film, in particular an underlayment, by forming a multi-layer composite material with a reinforcement layer and a membrane layer. Underlayments are known from the prior art in a wide variety of designs for placement beneath a roof covering or on a building facade. Thus, the prior art describes waterproof underlayments that have a two-layer structure with a carrier layer made of a nonwoven fabric and a TPU-based sealing layer. Examples of these are EP 2592196 B1, DE 202009007315 U1, DE 20 2010000934 U1,The latter also describes a three-layer structure with sealing layers arranged on both sides of the carrier layer. More than three-layer roofing membranes are known, for example, from DE 102017003364 A1, which describes an underlay membrane with at least one outer nonwoven layer, at least one inner nonwoven layer, at least one microporous membrane layer based on at least one polyolefinic plastic, and at least one further microporous membrane layer based on a polyolefinic plastic between the nonwoven layers, which is separated from the membrane layer by a separating layer. EP 0708212 A1 discloses an underlay membrane having a three-layer structure comprising two water- and water-vapor-permeable, water- and water-vapor-resistant nonwoven layers and a film-like, water-vapor-permeable, water-impermeable,A water and / or water vapor-absorbing and water and water vapor-resistant barrier layer is known from DE 102015012015 A1, a multilayer composite film for the construction sector, comprising at least one water and water vapor-permeable carrier layer and a waterproof and water vapor-permeable functional layer, wherein the material of the functional layer is a TPU of the carbonate type. The prior art therefore predominantly describes the use of nonwovens. However, the use of fabrics is also known. For example, DE 1659300 A1 describes a flame-resistant, adhesive-suitable plastic composite sheet for roofing, consisting of a flame-resistant plastic film and a bonding and also flame-resistant or non-flammable woven, knitted, or non-woven fabric, wherein the flame-resistant or non-flammable woven, knitted, or non-woven fabric is fixed to the underside intended for bonding in such a way thatthat it is not enveloped by the plastic. On top of the flame-resistant plastic film, another flame-resistant and particularly weather-resistant film, preferably made of polyvinyl fluoride or polytetrafluoroethylene, can be arranged. This structure ensures that the connection to the underside roof and the topside roof film, which is made by hot bitumen or adhesive, receives an adhesion-promoting component. The present invention is based on the object of creating an improved, flame-resistant construction film that can be used as a connection to the roof substructure or facade substructure even without the use of bitumen. This object is achieved with the construction film mentioned at the outset, in which the membrane layer is formed by at least one polymer selected from a group comprising fluoropolymers, in particular polytetrafluoroethylene, and thermoplastic polyurethanes, and the strength-bearing layer is formed by a fiber structure,in particular a woven or knitted fabric, is formed from a fiber material. Furthermore, the object is achieved by the method mentioned at the outset, according to which at least one polymer selected from a group comprising fluoropolymers, in particular polytetrafluoroethylene, and thermoplastic polyurethanes is used as the membrane system, and a fiber structure, in particular a woven or knitted fabric, made from a fiber material is used for the reinforcement layer. The advantage here is that the reinforcement layer can provide better protection for the membrane layer, the construction film can also be made tread-resistant, and that, due to the materials of the membrane layer, the construction film can be designed with improved water impermeability and vapor permeability. According to a preferred embodiment of the invention, it can be provided,that the membrane layer is or will be arranged between the reinforcement layer and another layer. The advantage here is that the membrane layer can be better protected against mechanical stress by being integrated on both sides. Due to the reinforcement layer, which is usually on the outside when the construction film is installed, the construction film can be designed to be walk-on resistant, so that the construction film in the roofing membrane version can also be walked on without being damaged. The combination of a reinforcement with the additional layer of a fiber material with the intermediate arrangement of the membrane layer improves the usability of polymer materials that are highly effective in terms of water impermeability and vapor permeability, whereby the layer thickness of the membrane layer can be kept low due to the protective layers on both sides. According to one embodiment of the invention, it can be providedthat the fiber material of the fiber structure is formed exclusively from inorganic fibers, in particular from glass fibers, basalt fibers, carbon fibers, or mixtures thereof or with them. By using exclusively inorganic fibers, the reinforcement layer can form a fire barrier. This can be further enhanced if a fluoropolymer, in particular polytetrafluoroethylene, is used as the membrane layer. The construction film can therefore have a fire-retardant effect and thus counteract the spread of fire. According to a further embodiment of the invention, it can be provided that the fiber structure, in particular the woven or knitted fabric, has a basis weight between 50 g / m² and 250 g / m², whereby the aforementioned effects can be further improved.since this allows, in particular, a (very) dense fiber structure to be used. Also to improve the aforementioned effects, according to one embodiment of the invention, it can be provided that the further layer is designed like the reinforcement layer. An improvement in the membrane properties can be achieved if, according to one embodiment of the invention, the polymer of the membrane layer is uniaxially or biaxially stretched. By stretching the membrane polymer, a microporous layer can be produced that is waterproof and windproof, but still permeable to water vapor. These properties of the membrane layer are particularly pronounced when the fluoropolymer is a polytetrafluoroethylene. According to another embodiment of the invention, it can be providedthat the membrane layer lies directly against the reinforcement layer and the further layer and is connected thereto. This can simplify the production of the membrane layer, since the application of an additional adhesion promoter between the layers of the construction film can be omitted. As an alternative to this embodiment, according to another embodiment of the invention, it can be provided that the membrane layer is connected to the reinforcement layer and the further layer by means of an adhesion promoter. According to another embodiment of the invention, it can be provided that the adhesion promoter is arranged in less than 100% of the contact surface of the membrane layer on the reinforcement layer and / or that the adhesion promoter is arranged in less than 100% of the contact surface of the membrane layer on the further layer. This enables better mobility of the membrane layer in the construction film, thus reducing tensions in the layer structure.e.g., as a result of temperature fluctuations, and their impact on the permeation properties of the construction film can be better avoided. According to another embodiment of the invention, it can be provided that the additional layer is designed to provide electromagnetic shielding. This allows the construction film not only to fulfill its inherent functions, but can also, for example, introduce the additional effect of electromagnetic shielding into the roof structure or the facade structure under photovoltaic systems, whereby no further measures are required. According to one embodiment of the invention, it can be provided that the additional layer has a higher surface weight than the reinforcement layer. The construction film can thus be better protected against mechanical damage resulting from different thermal expansions of the substrate and the construction film. According to another embodiment of the invention, it can be providedthat the further layer is formed from fibers that differ from the fibers of the reinforcement layer, which allows, for example, the rear layer of the construction film to be given different strength values ​​or different properties than the front layer. The construction film can thus be better adapted to a wide variety of applications. To further improve the properties of the construction film, according to one embodiment of the invention, the membrane layer can be designed in multiple layers. This makes it possible, for example, to achieve the properties "windproof," "waterproof," and "vapor-permeable" with different polymers, so that according to one embodiment, the multi-layer membrane layer can be provided with at least two layers,wherein the two layers each comprise a polymer, and wherein the polymers are different from one another. With this embodiment, the nail strength or nail tightness of the construction film can also be improved, for example, by one polymer being a "self-sealing" polymer that forms a seal against the nail shaft after a nail has penetrated. For example, in this embodiment, one layer can consist of a PTFE and the other layer of a TPU, or the layers can comprise these polymers. For a better understanding of the invention, it is explained in more detail with reference to the following figure. It shows, in each case, a simplified, schematic representation: Fig. 1 A section of a construction film in a side view; Fig. 2 A section of a variant of the construction film in a side view. By way of introduction, it should be noted thatthat in the variously described embodiments, identical parts are provided with identical reference numerals or identical component designations, whereby the disclosures contained in the entire description can be applied mutatis mutandis to identical parts with identical reference numerals or identical component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and in the event of a change in position, these positional information is to be applied mutatis mutandis to the new position. It should be noted at this point that references to standards are to be understood as meaning the respective standards in the version valid on the filing date of this or the priority-establishing patent application, unless otherwise stated. Fig. 1 shows a section of a construction film 1,in particular, an underlay membrane (also referred to as an underroof membrane or facade membrane), shown in a side view. In addition to its design as a construction film 1 in the form of an underlay membrane, it can also be used as a fire barrier or as shielding against electrosmog, etc. The construction film 1 in the "underlay membrane" version serves as a second water-draining layer beneath the roof covering, e.g., with tiles, to protect against drifting, capillary, stagnant, and condensate water or dirt. The construction film 1 can also be used as a facade membrane for wind- and rainwater-tight facade constructions, for example, in a ventilated facade construction with facade cladding. Furthermore, the construction film 1 can be used beneath a photovoltaic module or a photovoltaic tile, etc.used as a shielding film against electrosmog. In the roof membrane version, the construction film 1 can lie directly on a roof sheathing and, in particular, be attached to it. The roof sheathing can be formed, for example, from (rough-sawn) wooden boards. On the outside, battens of a counter batten can be attached. The counter battens, as is well known, support the battens for the roof tiles. The battens can be connected to the roof substructure with fasteners, such as nails. For this purpose, the fasteners penetrate the construction film 1. In the facade membrane version, the construction film 1 can also lie directly on a corresponding substructure, e.g., thermal insulation, and be covered from the outside with a facade cladding. Battens, possibly with counter battens, can again be used to install the facade cladding.whose fastening means penetrate the construction film 1. Since such roof and facade structures are known per se, reference is made to the relevant state of the art for further details. Apart from such facade and roof structures, the construction film 1 can also be used in other structures on the exterior of buildings. In the preferred embodiment of the construction film 1, it is used on the exterior of a building, such as in the roof structure or the facade structure. All of the following statements regarding the construction film 1 in the underlayment or underlayment design can therefore also be applied to the facade membrane or the other stated uses of the construction film 1, unless explicitly stated otherwise. In the preferred embodiment, the construction film 1 is waterproof and vapor-permeable. Waterproof meansthat the construction film 1 meets the requirements of EN 13859 Part 1 / 2. Vapour permeable means that the water vapor permeability Sd according to EN 13859 Part 1 / 2 is between 0.01 m, in particular 0.02 m, and 0.5 m. The construction film 1 can have a width of at least 0.3 m, in particular between 0.5 m and 2 m. The width is measured at an angle of 90 ° to the winding direction of the construction film 1 on a roll. However, this information is only intended to explain the term “web”. It does not limit the invention. The construction film 1 comprises a multi-layer composite material 2 or consists thereof. The multi-layer composite material 2 in the embodiment according to Fig. 1 comprises three layers, namely a reinforcement layer 3, a membrane layer 4 and a further layer 5, or consists thereof. In the simplest version of the construction film 1, it consists only of the reinforcement layer 3 and the membrane layer 4,is therefore constructed in two layers. The reinforcement layer 3 is arranged on the outside, i.e., it faces the weather side. The additional layer 5, if present, is arranged on the inside, i.e., it faces the building side. The membrane layer 4 is arranged between the reinforcement layer 3 and the additional layer 5 or below the reinforcement layer 3. In the variant of the construction film 1 with an additional layer 5 as an underlay, the additional layer 5 can rest (directly) on the roof sheathing. The membrane layer 4 ensures watertightness and water vapor permeability. The reinforcement layer 3 is formed by a fiber structure made of fibers. The fiber structure is preferably a woven or knitted fabric or a knitted fabric made of fibers. The term "fiber" is used synonymously with thread in this description, so that the term "fiber" includes both fibers per se and threads. The fabric can, for example, be made with a canvas.Twill or satin weave. A plain weave is preferably used. The fabric or the reinforcement layer 3 can have a basis weight between 10 g / m² and 1000 g / m², in particular between 50 g / m² and 250 g / m². However, for the reasons stated above, a fabric or reinforcement layer 3 with a basis weight between 100 g / m² and 250 g / m², in particular between 150 g / m² and 220 g / m², is preferably used. This allows a closed layer to be created, which not only enables improved impact resistance of the construction film 1, but can also achieve a uniform material bond to the membrane layer 4. In addition, properties of the first construction film 1, such as thermal expansion or creep tendency, can be influenced. However, it is also possiblean open-mesh or more open-mesh fabric with a basis weight between 10 g / m² and 90 g / m² is to be used. The reinforcement layer 3 can be single-layered or multi-layered. In the multi-layered design, at least some of the layers can be different from the at least one further layer, for example, they can consist of different fibers or have a different basis weight. It is also possible for rubberized fibers to be used in the fabric or in the fiber structure or the reinforcement layer 3. The fabric or the reinforcement layer 3 is formed with inorganic fibers. In particular, these fibers can be selected from a group comprising or consisting of glass fibers, carbon fibers, mineral fibers, such as basalt fibers, or mixtures thereof or thereof or therewith. The proportion of inorganic fibers in the fiber structure, for example the fabric, can be at least 80 wt.%,in particular at least 90 wt.%. Preferably, the fabric or the reinforcement layer 3 consists exclusively of inorganic fibers, in particular exclusively of glass fibers. In the event that the reinforcement layer 3 or the fiber structure does not consist exclusively of inorganic fibers, it can comprise, for example, aramid fibers or natural fibers, such as hemp, sisal, and combinations thereof. However, with regard to the desired fire-retardant effect of the construction film 1, such fibers should be selected,which also have a fire-retardant effect or which have a fire-retardant finish. If necessary, the reinforcement layer 3 can also consist exclusively of fire-retardant organic fibers or organic polymer fibers. In the preferred embodiment of the construction film 1, however, the reinforcement layer 3 comprises or consists of inorganic fibers. The woven or knitted fabric or the reinforcement layer 3 can, if necessary (for example, if no or not exclusively inorganic fibers are used), also be provided with a special finish, such as UV stabilization, flame retardancy,etc. The further layer 5 can be designed identically to the reinforcement layer 3. The further layer 5 can form a further reinforcement layer. The above statements regarding the reinforcement layer 3 can therefore be transferred to the further layer 5. Preferably, the further layer 5 also comprises a fiber structure made of fibers, in particular a woven or knitted fabric, in particular with or made of inorganic fibers, or consists thereof. However, the further layer 5 can also be designed differently than the reinforcement layer 3. For example, the further layer 5 can be designed to provide electromagnetic shielding. This can be achieved, for example, if electrically conductive materials, such as metal fibers, e.g. made of copper or aluminum, and / or carbon fibers, are added to the fiber structure, in particular the woven or knitted fabric of the further layer 5. However, the further layer 5 can also be provided with a metal foil,a metal mesh or metallically vapor-deposited fibers. The metal foil or the metal mesh can be arranged on the back of the further layer 5 or between the membrane layer 4 and the further layer 5 or within the further layer 5, for example if the latter is designed in multiple layers. The further layer 5 can also have a different basis weight than the reinforcement layer 3, wherein the basis weight can be selected from the ranges mentioned above. The further layer 5 can have a lower basis weight than the reinforcement layer 3. Preferably, however, the further layer 5 has a higher basis weight than the reinforcement layer 3. The basis weights of the further layer 5 and the reinforcement layer 3 preferably differ by a maximum of 20%, in particular a maximum of 10%. According to another embodiment, it can also be provided,that the further layer 5 is formed from fibers that are different from the fibers of the reinforcement layer 3. For example, the reinforcement layer 3 can be formed from glass fibers and the further layer 5 from basalt fibers. Other combinations of fibers, in particular inorganic fibers, preferably from the aforementioned group, are also possible. The membrane layer 4 comprises or consists of at least one polymer. A polymer within the meaning of the invention is a material produced from several similar building blocks, the so-called monomers. In particular, the polymer is exclusively a synthetic polymer. The polymer is selected from a group comprising or consisting of fluoropolymers, in particular polytetrafluoroethylene (PTFE), expanded polytetrafluoroethylene (ePTFE), and thermoplastic polyurethanes (TPU). The membrane layer 4 is particularly preferably made of PTFE and / or ePTFE. The (e)PTFE can have pores with a pore size between 0,2 + / - 0.1 µm and 0.6 + / - 0.2 µm. However, the fluoropolymer can also be a perfluoropolymer, e.g. a perfluoroalkoxy polymer (PFA), a polymer with polyhexafluoropropylene (HFP), a perfluoro(ethylene-propylene) copolymer (FEP), an ethylene-tetrafluoroethylene copolymer (ETFE), a polyvinylidene fluoride (PVDF), a polychlorotrifluoroethylene (PCTFE), a copolymer with perfluoropropylene vinyl ether (PPVE), e.g. a PTFE modified with PPVE, a perfluoromethyl vinyl ether (MFA) and a mixture thereof or with PTFE. According to a further embodiment of the construction film 1, it can be provided that the polymer of the membrane layer 4, in particular the PTFE, is uniaxially or biaxially stretched (oriented). A stretching ratio can be selected from a range of 1:4 to 1:15, in particular 1:4 to 1:12. In the case of biaxially stretched polymers, it can be provided that the stretching in the film direction or in the web direction is different, in particular greater,than in the direction orthogonal thereto (the width of the film or web). Uniaxial stretching preferably takes place in the film direction, i.e., the length of the film (the winding direction). Stretching can take place at a temperature between 130 °C and 400 °C, in particular between 150 °C and 290 °C. Stretching preferably takes place in a continuous process, i.e., while the film or web is moving. Furthermore, stretching can be carried out using known stretching devices. Reference is made to the relevant prior art. In the embodiment shown in Fig. 1, the membrane layer 4 lies directly against the reinforcement layer 3 and the further layer 5 and is connected thereto. This can be achieved, for example, by pressing the reinforcement layer 3, the membrane layer 4, and the further layer 5 together. For this embodiment, it is advantageousif the membrane layer 4 has a basis weight between 3 g / m² and 30 g / m². In general, the membrane layer 4 can have a basis weight between 1 g / m² and 80 g / m², in particular between 1 g / m² and 40 g / m², preferably between 2.5 g / m² and 20 g / m². The membrane layer 4 can have a layer thickness between 5 µm and 60 µm. Alternatively or additionally, it is also possible for the membrane layer 4 to be bonded to the strength carrier layer 3 and / or the further layer 5 by means of an adhesion promoter. A (reactive) polyurethane-based hot melt adhesive, for example, can be used as the adhesion promoter. Such adhesion promoters are known from the relevant prior art. In this embodiment of the construction film 1, it is advantageous if the adhesion promoter is present in less than 100%, in particular less than 70%, preferably less than 50%.the contact surface of the membrane layer 4 is arranged on the reinforcement layer 3 and / or that the adhesion promoter is arranged in less than 100%, in particular less than 70%, preferably less than 50%, of the contact surface of the membrane layer 4 on the further layer 5. The adhesion promoter can be arranged in at least 10%, in particular at least 15%, preferably at least 20%, of the contact surface of the membrane layer 4 on the reinforcement layer 3 and / or in at least 10%, in particular at least 15%, preferably at least 20%, of the contact surface of the membrane layer 4 on the further layer 5. The adhesion promoter can be applied in powder form, bead form, or band form. The bonding can be carried out, for example, in a point-like or strip-like manner. The connection points can be arranged at a distance from one another,which is selected from a range of 1 mm to 10 mm. The distance is the shortest distance between any two directly adjacent connection points. The connection points can be arranged in the form of a grid (square, rectangle, rhombus, etc.). Fig. 2 shows a section of a further and possibly independent design variant of the construction film 1. This again comprises the reinforcement layer 3, the membrane layer 4, and the further layer 5. To avoid repetition, reference is made to the above explanations regarding these layers. In contrast to the design variant of the construction film 1 according to Fig. 1, in this design variant, the membrane layer 4 is multi-layered or multi-ply. In the specifically illustrated design variant, the membrane layer 4 has a first partial layer 6 and a second partial layer 7. However, the membrane layer 4 can also have more than these two partial layers 6, 7.for example, three or four. Each of the sublayers 6, 7 preferably extends over the entire surface of the construction film 1 (viewed in plan view). The sublayers 6, 7 are therefore not only arranged in discrete areas, although this is possible within the scope of the invention. For example, the membrane layer 4 can consist of several strip-shaped sublayers 6, 7 arranged next to one another in a common plane, in particular alternating. The sublayers 6, 7 can consist of the same material, for example, PTFE. It can also be provided that the sublayers 6, 7 of the multilayer membrane system 4 each comprise or consist of at least one polymer, wherein the polymers are different from one another. For example, one of the sublayers 6, 7 can consist of a PTFE and the other of the sublayers 6, 7 can consist of a TPU in order to impart improved nail-tightness to the construction film 1. Nail-tightness here meansthat a nail penetrating the construction film 1 does not cause water to penetrate through the construction film 1 from the outside to the inside. The partial layers 6, 7 can all have the same layer thickness. However, they can also have different layer thicknesses, as shown in Fig. 2. For example, the partial layer 7 facing the further layer 5 can have a greater layer thickness than the partial layer 6 facing the reinforcement layer 3. The construction film 1 can be manufactured by forming a multi-layer composite material. For this purpose, at least the reinforcement layer 3, the membrane layer 4, and optionally the further layer 5 are provided.arranged one above the other and bonded together. Production is preferably carried out continuously using known technologies for the production of multilayer films. Therefore, reference is made to the relevant prior art for further details. The following examples were produced to evaluate construction film 1, among others. Example 1: A construction film 1 was produced which had the following structure: Glass fiber fabric as reinforcement layer 3, 75 g / m² Adhesive layer: Hotmelt adhesive Membrane layer 3: PTFE, 3 g / m² Adhesive layer: Hotmelt adhesive Glass fiber fabric as additional layer 5: 75 g / m² Example 2: A construction film 1 was produced which had the following structure: Glass fiber fabric as reinforcement layer 3: 150 g / m² Membrane layer 3: PTFE, 20 g / m² Glass fiber fabric as additional layer 5: 100 g / m² Example 3: A construction film 1 was produced which had the following structure: Glass fiber fabric as reinforcement layer 3: 200 g / m² Adhesive layer: Hotmelt adhesive Membrane layer 3: PTFE, 9,53 g / m² Adhesive layer: Hotmelt adhesive Glass fiber fabric as additional layer 5: 200 g / m² Example 4: A construction film 1 was produced with the following structure: Glass fiber fabric as reinforcement layer 3: 150 g / m² Adhesive layer: Hotmelt adhesive Membrane layer 3: PTFE, 30 g / m² Adhesive layer: Hotmelt adhesive Basalt fiber fabric as additional layer 5: 200 g / m² The exemplary embodiments show and describe possible design variants of the construction film 1. It should be noted at this point that combinations of the individual design variants are also possible. For the sake of clarity, it should be noted that, for a better understanding of the structure of the construction film 1, these and their components are not shown to scale.

[0002] Reference symbol list Construction film Multi-layer composite material Strengthening layer Membrane layer Layer Partial layer Partial layer

Claims

Patent claims 1. Construction film (1) comprising a multi-layer composite material (2) with a reinforcement layer (3) and a membrane layer (4), characterized in that the membrane layer (4) is formed by at least one polymer selected from a group comprising fluoropolymers, in particular polytetrafluoroethylene, and thermoplastic polyurethanes, and in that the reinforcement layer (3) is further formed by a fiber structure, in particular a woven or knitted fabric made of a fiber material.

2. Construction film according to claim 1, characterized in that the membrane layer is arranged between the reinforcement layer (3) and a further layer (5).

3. Construction film (1) according to claim 1 or 2, characterized in that the fiber material of the fiber structure is formed exclusively by inorganic fibers, in particular by glass fibers, basalt fibers, carbon fibers, or mixtures thereof. 4.Construction film (1) according to one of claims 1 to 3, characterized in that the fiber structure has a basis weight between 50 g / m² and 250 g / m².

5. Construction film (1) according to one of claims 2 to 4, characterized in that the further layer (5) is designed according to claim 3 or 4.

6. Construction film (1) according to one of claims 1 to 5, characterized in that the polymer of the membrane layer (4) is uniaxially or biaxially stretched.

7. Construction film (1) according to one of claims 1 to 6, characterized in that the membrane system (4) lies directly against the reinforcement layer (3) and is connected thereto.

8. Construction film (1) according to one of claims 2 to 7, characterized in that the membrane system (4) lies directly against the further layer (4) and is connected thereto.

9. Construction film (1) according to one of claims 1 to 8, characterized in that the membrane system (4) is connected to the reinforcement layer (3) by means of an adhesion promoter.

10. Construction film (1) according to one of claims 2 to 9, characterized in that the membrane system (4) is connected to the further layer (5) by means of an adhesion promoter.

11. Construction film (1) according to claim 9 or 10, characterized in that the adhesion promoter is arranged in less than 100% of the contact surface of the membrane layer (4) on the reinforcement layer (3).

12. Construction film (1) according to claim 10 or 11, characterized in that the adhesion promoter is arranged in less than 100% of the contact surface of the membrane layer (4) on the further layer (5).

13. Construction film (1) according to one of claims 1 to 12, characterized in that the further layer (5) is designed to provide electromagnetic shielding.

14. Construction film (1) according to one of claims 2 to 13, characterized in that the additional layer (5) has a higher basis weight than the reinforcement layer (3).Construction film (1) according to one of claims 2 to 14, characterized in that the further layer (5) is formed from fibers that are different from the fibers of the reinforcement layer (3).

16. Construction film (1) according to one of claims 1 to 15, characterized in that the membrane system (4) is multi-layered.

17. Construction film (1) according to claim 16, characterized in that the multi-layer membrane system (4) has at least two partial layers (6, 7), wherein the two partial layers (6, 7) each comprise a polymer, and wherein the polymers are different from one another. 18.Method for producing a construction film (1) by forming a multi-layer composite material (2) with a reinforcement layer (3) and a membrane layer (4), characterized in that at least one polymer selected from a group comprising fluoropolymers, in particular polytetrafluoroethylene, and thermoplastic polyurethanes is used as the membrane layer (4), and that a fiber structure, in particular a woven or knitted fabric, made of a fiber material is further used for the reinforcement layer (3).

19. Method according to claim 18, characterized in that the membrane layer (4) is arranged between the reinforcement layer (3) and a further layer (5) and is connected to the reinforcement layer (3) and the further layer (5).

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