Corner protection element for heat insulations in the area of building openings

Abstract

The present invention relates to a corner protection element for thermal insulation in the area of ​​building openings, in particular window and door openings. In particular, the invention relates to a corner protection element for reducing, in particular, micro- and / or hairline cracking in external thermal insulation composite systems (ETICS) in the corner area of ​​building openings, especially window or door openings, particularly when using moisture-sensitive ecological insulation materials and / or in timber construction.

Description

[0001] The present invention relates to a corner protection element for thermal insulation in the area of ​​building openings, in particular window and door openings. Specifically, the invention relates to a corner protection element for reducing moisture ingress, particularly through micro- and / or hairline cracking in external thermal insulation composite systems (ETICS) in the corner area of ​​building openings, especially window or door openings, particularly when using moisture-sensitive ecological insulation materials and / or in timber construction. Furthermore, the homogeneous surface of the corner protection element counteracts the formation of micro- and / or hairline cracks, as it bridges structural joints within the insulation layer.

[0002] Contrary to previous beliefs, even the smallest hairline cracks (0.2 mm) in the plaster system of an ETICS (External Thermal Insulation Composite System) are capillary-active. Naturally, the corner areas of window or door openings are highly susceptible to notch cracking, so the cracks described above are highly likely to occur depending on time and load parameters. To prevent cracking in the plaster system, diagonal reinforcements or lintel corner profiles are embedded in the reinforcement layer to counteract any stresses that may occur. However, this only achieves limited success in practice. To prevent the moisture transported by capillary action in the cracks from saturating the underlying insulation material, especially ecological or mineral insulation, it makes sense to implement a structural protective measure in the crack-prone area described above, thus removing the moisture-sensitive insulation from the danger zone.Up until now, moisture-resistant insulating materials in strip form have been used here as frames or wedges.

[0003] Ecological insulating materials within the meaning of this invention are in particular based on natural fibers such as wood or cellulose fibers, plant fibers such as hemp, sisal, rapeseed, coconut, kenaf, nettle, ramie, cattail, cereal straw, miscanthus, reed, jute, cotton or flax fibers, as well as cork, animal wool, seagrass or straw or mixtures thereof.

[0004] Due to the construction method of timber framing, particularly timber frame construction (requiring backing of joints), the dimensions of these components are severely limited, as backing is required for fire protection and stability. Especially with ecological panel insulation, the additional support board behind the insulation layer on the exterior of a timber frame structure, which is common with mineral wool or EPS insulation, is unnecessary, since the insulation itself forms the outer sheathing layer. Consequently, the width of the protective strips is limited by half the width of the timber stud and the edge distance of the fasteners. Therefore, only strips of 30 or 40 mm can typically be installed around the window opening.The protective area formed by the strip-shaped insulation material is not large enough and also has additional joints and gaps, which promote the further transport of moisture within the building insulation and into the wooden structure behind it.

[0005] EP 3106578 A1 discloses a facade element for a building facade which, for forming an external corner, has two legs arranged at an angle, in particular at a right angle, and which are made of an insulating material. One leg has an outer facing of a fabric and / or nonwoven material to form a surface ready for painting or coating. The invention further relates to a facade system with such a facade element and to a method for manufacturing a facade system according to the invention.

[0006] DE 29707409 U1 discloses a reveal corner profile for mounting on window and door reveals, to support the application of a thermal insulation composite system to facades.

[0007] DE 2020008011279 U1 discloses a building wall with a wall surface coated on its outer side with a thermal insulation layer, wherein the building wall has a wall opening in which a door and / or a window is arranged, wherein the lateral reveals of the wall opening are each covered with a thermal insulation reveal element, wherein the reveal element, starting from the door and / or the window to the outer surface of the thermal insulation layer facing away from the wall surface, has an inner panel section covering the reveal of the wall surface and an outer panel section covering the reveal of the thermal insulation layer, and wherein guide rails for a sunshade are arranged on the reveal elements.

[0008] DE 102005001913 A1 discloses a thermal insulation element for the reveal of window or door openings in buildings, comprising: a. a base component which, in the installed state of the thermal insulation element, is adjacent to a window frame inserted into the window opening or a door frame inserted into the door opening; b. a plate-shaped thermal insulation component which is combined with the base component and, in the installed state of the thermal insulation element, sits in front of the reveal; c. and a plastering strip which is attached to the base component and, in the installed state of the thermal insulation element, sits at the transition between the window or door frame and the base component.

[0009] Against this background, the object of the present invention is to provide reliable crack and / or moisture protection for building corners in external thermal insulation composite systems (ETICS), which can be installed without significant intervention in the ETICS. Furthermore, the object of the present invention is to provide a method for manufacturing corner protection for ETICS.

[0010] This problem is solved with regard to crack protection by a corner protection element according to claim 1 and with regard to the method to be provided by a method according to claim 10.

[0011] The invention proposes a corner protection element for reducing or preventing moisture damage, particularly in the case of micro- and / or hairline cracks in external thermal insulation composite systems in the corner area of ​​building openings, especially window or door openings, characterized in that the corner protection element has a substantially circular base with a radius r and a recess geometrically corresponding to the corner to be protected, wherein the recess has a horizontal leg H and a vertical leg V, wherein the horizontal leg H has a length LH in a range of less than or equal to 1.5 r to greater than or equal to 0.5 r and wherein the vertical leg V has a length LV in a range of less than or equal to 1.5 r to greater than or equal to 0.5 r

[0012] The corner protection element according to the invention advantageously uses the existing insulation as a support or backing, thus the protection area can be significantly extended without having to interfere with the underlying construction of the timber building.

[0013] It has been shown that the essentially circular base of the corner protection element, in combination with the intended length of the horizontal and vertical leg of the recess, allows for a reliable dissipation of any crack-causing forces, thereby significantly reducing the formation of capillary-acting and thus moisture-conducting cracks in weather-side layers of external thermal insulation composite systems.

[0014] Essentially circular within the meaning of the invention means that the corner protection element has a roundness in the plane in a range between ≤ 1.7 and ≥ 0.6, preferably between ≤ 1.5 and ≥ 0.7, and particularly between ≤ 1.1 and ≥ 0.8, wherein the roundness is calculated according to the formula U 2< / (4π*A), where U = circumference, and A = area. The radius within the meaning of the invention is given by r = b 2< / a, with b = minor semi-axis and a = major semi-axis.

[0015] According to one embodiment of the invention, the ratio of the length of the vertical leg V to the length of the horizontal leg H can satisfy the condition Lv < LH, preferably Lv ≤ 0.95 LH, more preferably Lv ≤ 0.9 LH, and particularly Lv ≤ 0.9 LH. It has been shown that such a recess design advantageously dissipates crack-inducing forces, thus stabilizing the weather-facing surface of a corner of a building opening to such an extent that capillary-acting hairline or microcracks are significantly reduced. The element can also be positioned higher in the Z direction. According to a further preferred embodiment of the invention, the corner protection element can have a thickness D in a range of 50 mm ≥ D ≥ 0.5 mm, preferably in a range of 40 mm ≥ D ≥ 2 mm.According to the invention, the corner protection element can be relatively thin and applied only superficially to the insulation of a thermal insulation composite system and beneath a base and / or topcoat plaster layer. In this configuration, the corner protection element is applied like a paving stone to potentially moisture-sensitive insulation in the area of ​​a building corner. Alternatively, the corner protection element can be up to 50 mm thick and inserted into the insulation as a cylindrical element, so that the weather-facing surface of the corner protection element is essentially flush with the weather-facing surface of the insulation. This applies to both the paving stone configuration and the configuration as an element inserted into the insulation.Once the element has been inserted, further layers, such as a base and / or top coat of plaster, can be applied, thus covering both the corner protection element and the surrounding insulation.

[0016] It has been shown that the essentially circular base of the corner protection element also allows for the simple creation of a recess in the existing insulation using a drill or milling tool to accommodate the corner protection element. This simplifies and makes the installation process more practical. Furthermore, panel joints in the substrate insulation can be covered, thus eliminating another factor contributing to the aforementioned cracking.

[0017] In one embodiment of the invention, the corner protection element may have a base body made of a moisture-resistant material selected from the group consisting of expanded polystyrene (EPS), extruded polystyrene (XPS), phenolic resin foam, rigid polyurethane foam, rigid polyisocyanurate foam, rigid polyethylene terephthalate foam, foam glass, recycled PET material, or ethyl propylene diene monomer rubber (EPDM). The selection of the base material depends essentially on the material of the surrounding insulation. It is therefore preferred that the coefficient of thermal expansion of the corner protection element corresponds essentially to the coefficient of thermal expansion of the surrounding insulation material. This further reduces stresses that can lead to cracking in the corner of a building opening caused by fluctuating outside temperatures.Preferably, the coefficient of expansion of the surrounding insulation to the coefficient of expansion of the corner protection element is in a range between ≤ 1.25 and ≥ 0.75.

[0018] According to a further embodiment of the invention, the corner protection element can have a mineral coating on its side facing away from the building when installed. This improves the adhesion of plaster applied after the corner protection element has been installed. Alternatively or additionally, the corner protection element can have a non-woven, woven, grid-like, or net-like layer on its side facing away from the building when installed. This layer can preferably be made of a plastic material, glass or mineral fiber, or a composite material of the aforementioned materials. Optionally, a mineral layer can be arranged on top of this layer. This improves the mechanical bond of a plaster layer to the weather-facing surface of the corner protection element.

[0019] According to a further embodiment of the invention, the corner protection element may have an adhesive layer on its side facing the building when installed. Such an adhesive layer facilitates the installation of the corner protection element. Through a corresponding material-bonded connection between the corner protection element and the insulation layer beneath it, any stresses that occur can be reliably transferred into the layers of insulation material located beneath the corner protection element, thereby reducing the occurrence of stresses in the corner area of ​​the building opening that promote cracking. According to one embodiment of the invention, the adhesives for such an adhesive layer may be selected from the group consisting of vinyl acetate emulsion, pure acrylate emulsion, styrene-acrylate emulsion, polyurethane, styrene-butadiene, and chloroprene latex.Suitable adhesives include those based on acrylates or polyurethanes, especially if they also contain mineral fillers. Other options include silane-modified polymers, for example polyether-based (MS polymers), or waterproof glues, as well as mineral-based adhesive slurries or coatings.

[0020] In particular, the corner protector may be designed to have a release film protecting the adhesive layer when not installed. This facilitates both the transport and storage of the corner protector, as well as its handling during installation.

[0021] According to a further embodiment of the invention, the corner protection element can be applied to existing insulation by applying a one- or multi-component adhesive or a mineral sealant with its nonwoven, woven, grid-like, or net-like layer. The corner protection element is applied to the corresponding area of ​​the insulation in the manner of a patch and fixed to the insulation, preferably by means of a material bond, using the adhesive and / or the mineral sealing slurry. Suitable base materials for adhesives and / or sealing slurries are, for example, selected from the group consisting of vinyl acetate emulsion, pure acrylate emulsion, styrene-acrylate emulsion, polyurethane, styrene-butadiene, and chloroprene latex. Sealing slurries made from such base materials contain mineral fillers.

[0022] According to a further embodiment of the invention, the corner protection element may have sections in the area of ​​legs H and / or V that extend into the depth of the building opening. These sections fold over towards the building in the area of ​​their edges, thus covering the edge resulting at the building opening. These sections may correspond substantially to the length of the respective legs H or V, or only to a portion of this length. It may also be provided that the part of the corner protection element extending into the building opening is comb-shaped and has a plurality of recesses.

[0023] According to a further embodiment of the invention, the corner protection element may have at least one through-hole for receiving a fastening element. This makes it possible to connect the corner element to the and / or underlying layers of a thermal insulation composite system in a substantially non-destructive manner using suitable fastening elements, such as an insulation anchor with a mechanical screw connection. In one embodiment, the fastening element may extend into the building's structural wall and thus contribute to fixing the thermal insulation composite system to the building's exterior.

[0024] According to a preferred embodiment, the corner protection element may already include a fastening element designed for mounting the corner protection element on the exterior of a building. This further simplifies installation.

[0025] Furthermore, the invention proposes a method for manufacturing corner protection for insulation in the area of ​​building openings, comprising the following method step: Provision of a corner protection element according to one of the above-mentioned configurations; optionally, creation of a recess in the insulation corresponding to the geometry of the corner protection element in the area of ​​a corner of the building opening to be protected; optionally, application of an adhesive layer or primer to at least a portion of the recess created in the insulation and / or the side of the corner protection element facing the building; insertion of the corner protection element into the recess created in the insulation or application of the corner protection element to the insulation; optionally, application of a base coat and / or top coat to the insulation and the corner protection element.

[0026] The inventive method makes it possible for less qualified assembly workers to reliably install a corner protector that reduces cracking at building openings.

[0027] In the case of a cylindrical corner protection element, the required recess can be created in the insulation in the area of ​​the building opening to be protected using a finger milling cutter, preferably with the aid of a template corresponding to the geometry of the corner protection element. Alternatively, the required recess can be created using a special circular drilling tool. This drilling tool has a diameter corresponding to the radius of the corner element.

[0028] The invention further relates to a kit-of-parts comprising a corner protection element according to the invention and a one- or multi-component adhesive or a mineral sealant, as well as optionally a template corresponding to the geometry of the corner protection element or a drilling tool corresponding to the geometry of the corner protection element.

[0029] The invention is further explained below with reference to figures. Figure 1 shows a paving-shaped corner protection element according to an embodiment of the invention; Figure 2 shows a cylindrical corner protection element according to an embodiment of the invention; Figure 3 shows a design for receiving a corner protection element according to Figur 2 Prepared corner of a building opening; Figure 4 shows a cylindrical corner protection element according to an embodiment of the invention with a fastening element arranged thereon.

[0030] Figure 1 Figure 1 shows a pavement-shaped corner protection element 100 according to an embodiment of the invention for reducing, in particular, micro- and / or hairline cracking and the associated moisture ingress in external thermal insulation composite systems 20 in the corner area 10 of building openings. Such corners 10 can be provided, in particular, at window or door openings. The corner protection element 100 has a substantially circular base with a radius r. Furthermore, the corner protection element 100 has a recess geometrically corresponding to the corner 10 to be protected. The recess has a horizontal leg H and a vertical leg V, wherein the horizontal leg H has a length LH in a range of less than or equal to 1.5r to greater than or equal to 0.5r, and wherein the vertical leg V has a length Lv in a range of less than or equal to 1.5r to greater than or equal to 0.5r.

[0031] Figure 2 Figure 1 shows a cylindrical corner protection element 110 according to an embodiment of the invention. The cylindrical corner protection element 110 also has a substantially circular basic geometry with a recess corresponding to the corner 10 to be protected, having a horizontal leg H and a vertical leg V. The corner protection element 110 has a thickness D in a range of 50 mm ≥ D ≥ 0.5 mm, preferably in a range of 40 mm ≥ D ≥ 2 mm, and is preferably embedded in the insulation 20 over its entire thickness D, so that it is substantially flush with the insulation on the weather side.

[0032] Figure 3 shows a design for receiving a corner protection element 110 according to Figur 2 Prepared corner 10 of a building opening. For this purpose, a circular recess 200 is formed in the insulation 20. The recess 200 can be formed, for example, using a finger milling cutter, preferably with the aid of a template corresponding to the geometry of the corner protection element.

[0033] Figure 4 Figure 1 shows a cylindrical corner protection element 110 according to an embodiment of the invention with a fastening element 300 arranged thereon. The fastening element 300 is inserted into a bore 120 in the corner protection element 110 and connected to the element via this bore by means of a force-fit and / or material-fit connection. The horizontal leg H and the vertical leg V of the recess receiving the corner to be protected are also visible. Reference sign

[0034] 10 Corner building opening 20 Insulation / ETICS 100 Corner protection element 110 Corner protection element 120 Drilling 200 Recess in insulation 300 Fastening element V Vertical leg H Horizontal leg D Thickness

Claims

1. Corner protection element (100, 110) for reducing, in particular, micro- and / or hairline crack formation in external thermal insulation composite systems (20) in the corner area of ​​building openings, especially window or door openings, characterized by the fact that the corner protection element (100, 110) has a substantially circular base with a radius r and a recess geometrically corresponding to one of the corners (10) to be protected, wherein the recess has a horizontal leg H and a vertical leg V, wherein the horizontal leg H has a length L H in a range from less than or equal to 1.5 r to greater than or equal to 0.5 r and wherein the vertical leg V has a length L V exhibits a range from less than or equal to 1.5 r to greater than or equal to 0.5 r.

2. Corner protection element (100, 110) according to claim 1, wherein L V < L H , where preferably Lv ≤ 0.95 L H , further preferred Lv ≤ 0.9 L H , especially Lv ≤ 0.9 LH .

3. Corner protection element (100, 110) according to one of the preceding claims, wherein the corner protection element has a thickness D in a range of 50mm ≥ D ≥ 0.5mm, preferably in a range of 40mm ≥ D ≥ 2mm.

4. Corner protection element (100, 110) according to one of the preceding claims, wherein this element has a nonwoven, woven, grid-like or net-like layer on its side facing away from the building when mounted.

5. Corner protection element (100, 110 according to one of the preceding claims, wherein this has sections in the area of ​​the legs H and / or V which extend into the depth of the building opening.

6. Corner protection element (100, 110) according to one of the preceding claims, wherein the corner protection element comprises a base body made of a moisture-insensitive material selected from the group consisting of expanded polystyrene (EPS), extruded (XPS), phenolic resin foam, polyurethane rigid foam, polyisocyanurate rigid foam, polyethylene terephthalate rigid foam, foam glass, and PET recycled material, or ethyl propylene diene monomer rubber (EPDM).

7. Corner protection element (100, 110) according to one of the preceding claims, wherein the corner protection element has a mineral coating on its side facing away from the building when mounted.

8. Corner protection element (100, 110) according to one of the preceding claims, wherein the corner protection element has an adhesive layer on its side facing the building in the mounted state.

9. Corner protection element (100, 110) according to claim 8, wherein the corner protection element has a release film protecting the adhesive layer in the unmounted state.

10. Corner protection element (100, 110) according to one of the preceding claims, wherein the corner protection element has at least one bore (120) for receiving a fastening element (300).

11. Corner protection element (100, 110) according to claim 10, wherein the corner protection element (100, 110) has at least one fastening element (300) which is configured to mount the corner protection element (100, 110) on an outside of a building.

12. Method for producing a corner protector for insulation (20) in the area of ​​building openings, comprising the following steps: - providing a corner protector (100, 110) according to any one of claims 1 to 9; - optionally, providing a recess (200) corresponding to the geometry of the corner protector (100, 110) in the insulation (20) in the area of ​​a corner (10) of the building opening to be protected; - optionally, applying an adhesive layer to at least a portion of the recess (200) provided in the insulation (20) and / or the side of the corner protector (100, 110) facing the building; - inserting the corner protector (100, 110) into the recess (200) provided in the insulation (20) or applying the corner protector (100, 110) to the insulation (20); - optionally applying a base and / or top coat of plaster to the insulation (20) and the corner protection element (100,110).

13. Method according to claim 12, wherein the insulation (20) comprises an ecological insulating material selected from the group consisting of wood or cellulose fibers, plant fibers such as hemp, jute, cotton or flax fibers, as well as cork, animal wool, seagrass or straw.

14. Use of a corner protection element (100, 110) according to one of claims 1 to 11 for use in timber frame construction or solid wood construction.

15. Kit-of-Parts comprising a corner protection element according to one of claims 1 to 7, 10 or 11 and a one- or multi-component adhesive or a mineral sealant, and optionally a template corresponding to the geometry of the corner protection element or a drilling tool corresponding to the geometry of the corner protection element.

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