EP3212856A1

EP3212856A1 - Insulating layer for a composite heat insulation system, and composite heat insulation system

Info

Publication number: EP3212856A1
Application number: EP15794486.9A
Authority: EP
Inventors: Hans-Dieter Middendorf
Original assignee: Saint Gobain Isover SA France
Current assignee: Saint Gobain Isover SA France
Priority date: 2014-10-28
Filing date: 2015-10-27
Publication date: 2017-09-06
Anticipated expiration: 2035-10-27
Also published as: RU2017118320A; EP3212856B1; RU2017118320A3; DE102014015829A1; RU2723774C2; WO2016066628A1

Abstract

The invention relates to an insulating layer of a composite heat insulation system that consists of facade insulation elements, having at least one outer-wall recess in the form of an undercut in all butt joint regions of adjoining insulating elements, said recess being filled with a hardened, frictional and elastic filler material.

Description

Insulating layer for a thermal insulation composite and Wärmedämmverbundsvstem

The invention relates to an insulating layer for a thermal insulation composite system. The invention further relates to a thermal insulation composite system and a method for its construction. Against the background of rising energy costs and increasing legal requirements, increasing the energy efficiency of buildings plays a key role. Of particular importance is the insulation of facades, especially in the form of thermal insulation systems (ETICS). External thermal insulation systems are usually constructed of an insulating layer attached to the facade or wall to be insulated with adhesives and / or mechanical fastening elements, in particular plate anchors, which is produced from adjoining insulating boards laid in the surface in association, and which has a flush-mounted reinforcement fabric on the outside and a top or top coat is completed, if necessary, they have as a further layer on an outside paint on. As insulating material, expanded polystyrene (EPS) and mineral wool insulating materials (glass and rockwool) are used in thermal insulation composite systems, other insulating materials, especially rigid foams such as extruded polystyrene and polyurethane (PUR) / polyisocyanurate (PIR) or phenolic resin / Resol, have only one subordinate practical significance.

To increase energy efficiency there has been a trend for years to increase insulation thicknesses. In the case of the relatively inelastic rigid foam insulation materials, ie expanded polystyrene (EPS), extruded polystyrene (XPS), polyurethane (PUR), polyisocyanurate (PIR), phenolic resin foam / resole, the increase in insulation thickness leads to a problem. Due to the local climatic conditions, in particular the orientation of the facade and the associated solar radiation there is a certain heating of the building envelope and the insulating layer. As the thickness of the insulating layer increases, an ever greater temperature gradient arises between the surface of the insulating layer facing the outside and the surface facing the bearing wall. This has the consequence that the surface facing the outside of the insulation board undergoes a significant thermal cycling, while the surface facing the wall has very little temperature fluctuations, which manifests itself in a different temperature-induced dynamic length expansion of the insulating layer usually forming individual insulation boards, which in any case a relatively smaller change in length facing inside of the insulating layer on the wall is additionally prevented by the attachment in the change in length. This effect is known as encryption. This dynamic expansion behavior of the insulation boards can lead to the formation of joints between adjacent insulation boards. Although the insulation boards are covered with a reinforced plaster in a thermal insulation system, but also leads to thinner plaster thickness despite the incorporated reinforcing layer to the increased risk of marking joints by the tearing of the plaster, the long term does not withstand the dynamic loads of the encryption.

In order to avoid the described problem, a number of solutions have been proposed in the past. Thus, DE 33 12 414 discloses an insulation board with circumferential Stufenfalzprofil, which are arranged as an insulating layer of a thermal insulation system so that the outside forms a recess which is filled with a preformed to the insulation boards material identical butt joint profile, which is glued to the adjacent insulation boards. The butt joint profile serves as a labyrinth seal, with which the penetration or penetration or the formation of moisture in the joint area should be prevented. To compensate for stresses, the butt joint profile is provided in particular with a one-sided fabric lamination, which is incorporated into the plaster layer in a known manner. A comparable solution with a preformed pressure piece is disclosed in DE 20 2006 015 663 U1. At the adhesive joint, the requirement is made to provide a perfect and durable composite of the profile elements and the insulation boards with each other. A disadvantage of these solutions is that additional custom-fit profile elements are required, which must be processed consuming on site. In addition, the profile elements are limited to simple geometric shapes such as cuboid or wedge shapes, so that the contact surface is limited. DE 35 28 776 provides to carry out the impact area in the form of an elastic strain strip, which is covered on the outside with an elastic sealant. Because of the sealant used in the groove of the elastic stretch strip with a lower Shore hardness heat movements should be barely visible in the elastic zone of the cover and thus in the plaster layer. This solution is a complex and expensive special solution that requires a confection of insulation boards and attached stretch marks and the application of the elastic sealant, at least partially on site on the site.

DE 298 20 778 U 1 discloses thermal insulation panels with tongue and groove made of plastic foam, which have in the space of two adjacent plates an expansion in the form of an undercut. This widening is positional between groove and Spring and the wall arranged and serves to prevent penetration of adhesive mortar, with which the insulation boards are fixed to the wall, down to the tongue and groove area safely. The external joint cracking is not discussed.

Based on this fact, the invention has the object to provide an insulating layer of a thermal insulation composite system of facade insulation boards, which avoids joints markings in the facade and at the same time is easy to manufacture and processing.

The object is achieved by an insulating layer of facade panels with the features of claim 1. Independent protection is claimed for a thermal insulation composite system with the features of claim 1 1 and a method for creating a thermal insulation composite system according to claim 1 2. Preferred developments of the invention are characterized by the features contained in the subclaims.

The insulating layer according to the invention of a thermal insulation composite system of facade insulation panels to be mounted on a building wall with a parallelepiped basic body with two opposing large areas and four lateral surfaces connecting the large areas has at least one recess in the form of an undercut at butt joint areas of adjoining panels. A profiling of the insulation boards is designed and arranged so that forms a recess with an adjacent, shockingly laid insulation board above the respective contact surface, which is arranged when laying the insulation boards as an insulating layer for a thermal insulation composite system on the side facing away from the wall. The recesses are filled with an elastic filling compound with adhesive properties, so that the plates are firmly connected to one another with a frictional, elastic connection, so that the sealing is substantially reduced. The embodiment of the recess in the form of an undercut results in a frictional, elastic connection with particularly good mechanical properties due to the increased contact area between filler material and an increased amount of filler material.

In addition to the term encryption also the term bowls or bowls is common, in English-speaking countries one speaks here of "bowing" or "buckling". One understands hereunder the one-sided thermal expansion of a plate on a facade under the influence of temperature, which is accompanied by a bulging of the insulation boards. The plates bulge like a bowl and cracks can form in the joint area. In addition to the formation of the frictional connection, this composite also advantageously provides a seal against the penetration of mortar into the joint. By applying the flush by means of the usual processing technology, it is unavoidable that mortar material is partially pressed into the butt joints. In addition to the resulting gaping of the butt joint is accompanied by such a mortar tongue training a thermal bridge, which can reduce the overall insulation effect of the thermal insulation system. Although in construction practice joints are already filled with a suitable material to avoid thermal bridges through wider joints, but this is only for joints of a certain width, which depends on the diameter of the outlet opening of the application device, usually a cartridge. Narrower butt joints in the range of a few millimeters are generally not reworked and are not connected to one another in a force-fit manner.

It is preferred that the facade insulation board has a profiling on two adjacent side surfaces. In this arrangement of the profiling "over corner", the side surfaces opposite the two profiled side surfaces just do not have a profiling The facade insulation panels are laid in the insulation layer in the dressing so that the profiled side surface of a facade insulation board adjoins the non-profiled side surface of an adjacent facade insulation board, so that the recess is formed by the profiling of a plate.

Alternatively, it is also possible that the insulation board has a circumferential profiling on all four side surfaces, so that the recess in the insulating layer by the interaction of profiling and counter profiling (the adjacent plate) is formed. Although it is also possible to provide a profiling on the two opposite side surfaces of a facade insulation board, however, this variant has the disadvantage that Fassadendämmplatten must be made with this form of profiling on the long side surfaces and on the short side surfaces, so two products are provided have to. A flat, i. continuous training of the recesses in the insulating layer is also given only in a laying in the cross dressing, which is generally less desirable.

Advantageously, the profiling extends over not more than 50% of the thickness of the insulating board and thus the insulating layer, more preferably not more than 25% of the thickness of the insulating board or the insulating layer. The non-profiled portion of the side surface serves as an abutment surface for laying the facade insulation panels to the insulating layer. The facade insulation board is material preferably made of expanded polystyrene (EPS), extruded polystyrene (XPS), polyurethane (PUR), polyisocyanurate (PIR) or phenolic resin / Resol formed. Particularly preferred is expanded polystyrene (EPS).

The filling compound has adhesive properties and allows a frictional and elastic connection between adjacent insulation boards. It is preferred that the filler after curing has an E modulus according to ISO 527 of 20 MPa to 150 MPa, more preferably from 50 MPa to 120 MPa.

Expediently, the filler material used is a material which has a thermal conductivity according to DIN 52612-2: 1984-06 of less than or equal to 0.060 W / (mK), preferably less than or equal to 0.040 W / (mK). Due to this insulating effect of the filling material advantageously a sign of the joints on the plastered facade is largely prevented.

To achieve a good permanent adhesive bond, it is preferred that the filler in the cured state has a tensile strength of the adhesive bond of at least 60 kPa, preferably at least 80 kPa according to EN 15870: 2009.

Preference is given to foamable filling compositions based on polyurethane or polyisocyanurate, which can be provided in cartridges. Alternatively, self-curing one- or multi-component adhesives based on plastics, mineral adhesives or plastic-modified ("tempered") mineral adhesives, mixed with insulating materials, preferably expanded polystyrene (EPS) in granular form, can be used.

A method for producing a thermal insulation composite system according to the invention is given by the steps

Applying an insulation layer according to the invention by abruptly laying facade insulation panels against a building wall to be insulated with adhesive and / or mechanical fastening means,

Filling the recesses formed between adjacent facade insulation panels on account of the profiling with an adhesive filling compound and hardening the filling compound to form a non-positive and elastic adhesive connection,

If necessary removal of filler mass projection and / or smoothing of the joint after hardening of the filling compound,

• Application of concealed plaster, reinforcing mesh and finishing plaster, and if necessary, of further cover layers. Conveniently, the insulating layer consists exclusively of the facade insulation panels according to the invention.

Due to the non-use of preformed profile elements with high provisioning and adaptation costs, a simple solution to the problem is made possible.

The invention will be described in more detail below with reference to exemplary embodiments, wherein identical objects are identified by the same reference numerals. Show it:

1 shows a facade insulation board for an insulating layer according to the prior art in a perspective view, Fig. 2a, the profiling of the facade insulation board of FIG .. 1

Fig. 2b-d different versions of the profiling of a facade insulation board for an insulating layer according to the invention.

Fig. 3 shows a detail of an insulating layer according to the invention

Facade insulation panels after attachment to the wall. 1 shows a Fassadendämmplatte 1 expanded polystyrene (EPS) in the form of a cuboid with a first large area 2, an opposite large area 3, two short side surfaces 4 and second long side surfaces 5. The facade insulation board 1 has a short side surface 4 a non- profiled side surface portion 4 'and a profiling 6 and on a long side surface 5 a non-profiled side surface portion 5' and a second profile 7 from. Both profiles 6, 7 are designed here as a rectangular recess, which is reproduced in cross-section of the sectional plane AA 'in Fig. 2a for the detail Z. The two profilings 6 and 7 have the same dimensions, so the length or width of the first large area 2 is smaller by 5 mm than the length or width of the second large area 3. Both profilings extend over a depth of 30 mm of the insulation board with dimensions of 1000 x 500 x 100 mm, based on the non-profiled block. In the example, the depth of the profiling thus amounts to 30% of the plate thickness. In the case of the rectangular recess, the dimension of each intermediate plane parallel to the large surfaces 2, 3 over the depth of profiling equal to the dimension of the first large area 2. Figs. 2b-2d show in an enlarged detail different embodiments of the profiling of a facade insulation board for a novel Insulating layer for the detail Z. For better comparability, the embodiments 2a to 2d are such arranged graphically with each other that the non-profiled side surface portions 4 'are aligned.

Fig. 2a shows the profile with right-angled recess according to the prior art of Fig. 1 enlarged. The profile width, i. the distance between the aligned plane of the non-profiled side surface portions 4 'and profiling 4 "of the side surface 4 is constant over the tread depth.

2b shows a first profiling of the facade insulation board for the insulating layer according to the invention. Here, the profiling has a comparatively small recess of 3 mm with respect to the aligned plane of the non-profiled side surface sections 4 ', and forms an undercut region 11 after a parallel edge region 10 until reaching the tread depth.

The profiling of Fig. 2c as further profiling of Fassadendämmplatte for the insulating layer according to the invention differs from the embodiment of FIG. 2 b in that the undercut is not formed with an oblique course, but is formed as a groove 12 below the parallel edge portion 10.

The profiling of FIG. 2d represents a trough-shaped or trapezoidal recess 13.

As can be seen immediately from Figures 2b-2d, the length of an intermediate plane, i. the extension in the direction of the cross-sectional area AA 'to the opposite side surface due to a larger profile width, in the embodiment 2b in the undercut region 1 1, in the embodiment 2c at each point of Nutausnehmung 12 and in the embodiment 2d at least the region of the plane parallel to the aligned plane bottom of the trough-shaped recess 13 smaller than the corresponding length of the first large area. This of course also applies to the case, not shown, of a profiling (exactly) of an orthogonal side surface. Although the profilings according to FIGS. 2b to 2d may be provided in an insulating panel on only two adjoining side surfaces, a circumferential profiling on all four side surfaces is advantageous in these profilings, so that a mirror-symmetrical joint is formed which, for the exemplary embodiment 2d, has a dashed line an adjoining further Fassadendämmplatte is indicated. The joint then has a bilateral undercut, which is filled by the filler material and allows a more intense connection of filler and facade insulation panels, so that a higher joint strength can be achieved.

Fig. 3 shows a section of an insulating layer according to the invention 14 of insulation boards after attachment to the wall, wherein the profilings 6, 7 of the Wall side are averted. For simplified illustration, any mechanical fasteners used are omitted and the reference numbers entered only once. 3 shows a total of twenty facade dam 2 slabs 1 profiled according to Fig. 2 b on "corner" on two adjacent side surfaces, which are arranged in a conventional manner in association before the introduction of the filling material. that the facade insulation panels 1 are arranged in the exemplary embodiment so that the profiles of parallel edge portion 10 and oblique undercut region 1 1 are located respectively at the right and at the bottom of a facade insulation board 1. This regular arrangement results in the surface at all abutting surfaces of insulating elements - In this embodiment, the joint 15 has a wedge-shaped shape and by the profiling 6 and 7 and the non-profiled side surface 4 and 5 of an abutting further facade insulation board 1. The limitation of Hi Intersection is not visible in plan view and indicated in Fig. 3 by the dashed lines 16.

After attaching the insulation boards 1 and the associated joint formation, the joints 15 are filled or filled with a suitable filler material, in particular a polyurethane foam adhesive in a subsequent step. After the foaming and curing time, material swollen out of the joint is removed with a craft knife and, if necessary, the joint is smoothed. On the insulation layer prepared in this way, the other layers, flush with reinforcing fabric, top coat / top coat and possibly other cover layers such as paints of the thermal insulation composite system are then applied in a conventional manner.

In addition to the bonding of abutting facade insulation panels according to the invention in the surface can be glued to one another orthogonally arranged facade insulation panels in the corner, which has a significant mechanical stabilization result.

The invention also leaves room for further embodiments.

It is not necessary that the profiling on all profiled side surfaces have the same geometry, it can also different geometries are combined.

The basic form of the facade element may also be different from a cuboid form a per se known Stufenfalzelement. The described inventive design of the profiling is then preferably formed in one of the two Dämmlagen the Stufenfalzelements. Deviating from the cuboid shape, the basic shape of the facade element can be a per se known tongue and groove element. The described inventive design of the profiling is then preferably arranged in one of the two outside Dämmlagen the three-layer tongue-and-groove member. It is obvious to the person skilled in the art that the concrete dimensions of the profiling, in particular the profile width at the application site, decisively match the narrow parallel edge region according to FIGS. 2b-2d, taking into account the counterprofile, the flow properties of the filling material and the geometry of the applicator member that a fast cavity filling can be achieved with minimal use of material.

The specified dimensions and material specifications are insofar merely illustrative. Other dimensions and materials are within the scope of the claimed invention.

Claims

[Claims]

1 . Insulating layer (14) of a thermal insulation composite system of facade insulation panels (1) to be attached to a building wall with a parallelepiped basic body with two opposing large surfaces (2,3) and four side surfaces (4,5) connecting the large surfaces, the recesses (27) facing away from the building wall on the outside 6,7), characterized in that the insulating layer at butt joint areas of adjacent plates has at least one outside recess in the form of an undercut and the undercut is filled with a cured adhesive elastic filling material.

2. Insulating layer (14) according to claim 1, characterized in that the insulating panels have two adjacent profiled side surfaces and two adjoining non-profiled side surfaces, and the recesses of the insulating layer formed by the interaction of a profiled and a non-profiled side surface of adjacent facade insulation panels are.

3. insulating layer (14) according to claim 1, characterized in that the insulating panels have a circumferential profiling on all four side surfaces, so that the recesses in the insulating layer is formed by the interaction of profiling and counter profiling of the adjacent plates

4. Insulating layer (14) according to one of the preceding claims, characterized in that the recess (6, 7) is not more than 50% of the thickness of the insulating layer (14), preferably not more than 25% of the thickness of the insulating layer (14 ).

5. insulating layer (14) according to any preceding claim, characterized in that the facade insulation panels of expanded polystyrene, extruded polystyrene, polyurethane, polyisocyanurate or phenolic resin / Resol are formed.

6. Insulating layer (14) according to any one of the preceding claims, characterized in that the filler material is an elastic filling material after its curing with an elastic modulus according to ISO 527 of 20 MPa to 150 MPa.

7. insulating layer (14) according to claim 6, characterized in that the elastic filling compound after curing has a modulus of elasticity of 50 MPa to 120 MPa.

8. Insulating layer (14) according to claim 6 or 7, characterized in that the filling compound has a thermal conductivity according to DIN 52612-2: 1984-06 of less than or equal to 0.060 W / (mK), preferably of less than or equal to 0.040 W / (mK ) having.

9. insulating layer (14) according to one of claims 6 to 8, characterized in that the filling compound after curing forms an adhesive bond between adjacent side surfaces having a tensile strength of at least 60 kPa, preferably at least 80 kPa according to EN 15870: 2009.

10. Insulating layer (14) according to any one of claims 6 to 9, characterized in that the filling compound is a foamed filling compound based on polyurethane or polyisocyanurate, an offset with insulating material automatically cured one- or multi-component adhesive based on plastic, or offset with insulating material is self-hardened mineral or plastic-modified mineral adhesive.

1 1. Thermal insulation composite system comprising an insulation layer (14) according to one of claims 1 to 10 according to the invention.

12. A method for creating a thermal insulation composite system, characterized by the steps

Attaching an insulating layer (14) according to one of claims 1 to 10 by abruptly laying facade insulation panels (1) on a building wall to be insulated with adhesive and / or mechanical fastening means,

Filling the recesses (6, 7, 15) formed between adjacent facade insulation panels on account of the profiling with an adhesive filling compound and curing of the adhesive filling compound to form a frictional and elastic adhesive connection,

Optionally removing filler supernatant and / or smoothing the recess (15) after hardening of the filling compound,

• Application of concealed plaster, reinforcing mesh and finishing plaster, and, where appropriate, of other cover layers.