EP0248193A2 - Joint cover - Google Patents

Abstract

For a steep roof 1 having a continuous, butted heat-insulating layer of foamed plastic insulating slabs 2, water vapour-permeable plastic strips 6, 7, in particular angled strips, which are anchored to the insulating slabs 2 at least on one side, are required over the joints 4, 5 in order to drain the surface water. <IMAGE>

Description

The invention relates to a joint cover of butted plastic insulation panels of a roof, in particular a pitched roof, to prevent the penetration of surface water while at the same time avoiding harmful water accumulations as a result of water vapor diffusion.

In the case of roofs, there is a risk during construction that rain will cause water to penetrate into the insulation layer through the butt joints, which reduces the thermal insulation value and can lead to undesired decay or corrosion in adjacent components.

But even after covering, there is the possibility of surface water being formed due to flying snow or damage to the roof skin. On the other hand, the one-sided sealing of the joints between the plastic foam insulation boards is not possible, since due to the steam pressure there is a risk of water accumulation in certain weather conditions, which could also cause the aforementioned damage.

The object of the invention is therefore to find a means, in particular for cuboid-like, inclined plastic foam insulation boards, which prevents the penetration of surface water into the butt joints and at the same time has such a low water vapor diffusion resistance. that harmful water accumulations cannot occur, which significantly reduce the thermal insulation value and lead to rotting or corroding of the adjacent components.

The object is achieved in that a surface water-impermeable strip is firmly connected at least on one side of a joint with insulation panels of the roof and that there are ways of removing the water vapor.

By sealing the butt joints of the insulation panels covered with a waterproof foil (aluminum foil) with or without tongue and groove on the side facing the weather, 20 ° surface water is preferably produced - even if the roof pitch is slight - without causing damage The resulting water vapor cannot be prevented from flowing through the surface-water-tight layer due to the vapor pressure gradient.

With a simple joint seal it is possible to create a fully functional roof during construction and operating times.

Those lying across the fall line. Joints can easily be covered by an extruded profile with flat legs. The lower leg runs parallel to the surface of a first thermal insulation board, whereby the surface water is led over the butt joint, while the steam coming out of the joint can freely draw off below the leg. The upper leg has a smaller slope than the roof slope, and is held in a slot in the corner of the second, upward-facing insulation board, which begins at an angle to the outer surface. The existing inclination is still large enough to drain any water that may be drawn towards the eaves. In order to avoid pulling out the plastic panel, protruding parts are attached to the upper leg in the area of the second insulation panel, which act as barbs.

In another embodiment, a flat strip of flexible film or extruded profile is applied over the joints - in particular in the direction of the fall line - on the surface of the waterproof insulation boards and is preferably attached with a self-adhesive. The required vapor permeability, which in the form of a diffusion-equivalent air layer thickness s _d = µ.s. measured with water vapor diffusion resistance factor µ and sample thickness s (DIN 52 615 B11) is achieved by a diffusion-open film sd 1.8 m or by punctiform attachment to elevations in the form of grooves and knobs. The latter does not allow water to penetrate , but allow the steam to escape.

Furthermore, it is possible to equip the flexible strips with a network or water-repellent fibers which, in addition to the vapor permeability, provide the strip with a specific

Provide strength so that tearing does not occur when the insulation boards move due to temperature changes and shrinkage.

• Fig. 1 Draufsicht auf ein Steildach
• Fig. 2 Schnitt durch ein Steildach
• Fig. 3 Prespektivansicht, eines abgewinkelten Streifen
• Fig. 4 Perspektivansicht eines flexiblen Bandes

The example of the invention is shown in the drawings and is described below. Show it:

• Fig. 1 top view of a pitched roof
• Fig. 2 section through a pitched roof
• Fig. 3 perspective view of an angled strip
• Fig. 4 perspective view of a flexible band

In Fig. 1, a pitched roof 1 is shown in plan view in which the transversely arranged insulating panels 2 made of polyurethane foam have 3 joints 4 or joints 5 occupied in the direction of the fall line 3. Above the continuous joints 4 are angled plastic strips Plates 6 arranged. The offset joints 5, on the other hand, are covered by strips in the form of flexible strips 7 which end above and below the plastic plates 6.

In Fig. 2 a section through the pitched roof 1 is drawn by the tongue 10 in the groove 8 of the lower insulation board 9 the upper insulation panels 11. The insulation panels 9, 11 made of polyurethane are each covered with an aluminum foil 12 at the top. The angled plastic plate 6 lies with one leg 13, in particular via curvature 14, on the aluminum foil 12, while the other leg 15, which has a slope that is 25 ° lower than the falling line 3, sits in a slot 16 which extends into an enlarged space 17 ends to receive a projecting part 18 there.

In Fig. 3, an angled plastic plate 6 is shown in perspective. It consists of a first leg 13 which at the end has a slight curvature 14 downwards for better installation and a second leg 15 which forms an angle of 25 ° with the imaginary extension of the first leg and in order to resist pulling out in a projecting part 18 in Form of a right-angled leg ends.

4, a flexible tape 7 is provided in the area of the support with self-adhesive surface 19 in the edge areas of one third of the total width, which are covered with oil paper 20 until it is removed. Furthermore, inclined grooves 21 are provided as elevation 21 in the right edge region for the removal of the steam.

Claims (7)

1. Joint covering of pushed plastic foam insulation panels of a roof, in particular pitched roofs, to prevent the ingress of surface water while at the same time avoiding damaging water accumulation due to water vapor diffusion, characterized in that a surface water impermeable, flat strip (6, 7) is at least on one side of a joint ( 4,5) with insulation panels (2) of the roof (1) and that there are ways to remove the water vapor. 2. Joint cover according to claim 1, characterized in that an angled plastic plate (6) serves as a strip in which one leg (13) rests on the lower - seen in the direction of fall - insulation board 9 and in which the other leg 15 at an angle of 12-40 °, in particular ovn 20-30 °, engages with the surface of the upper insulation board (11) in a correspondingly inclined slot (16) of this insulation board (11). 3. Joint cover according to claim 2, characterized in that the upper leg (15) has projecting parts (18) as a pull-out lock. 4. joint cover according to claim 1, characterized in that the flat strip (7) is equipped on the underside of plastic along one or both edges with a self-adhesive surface 19. 5. Joint cover according to claim 4, characterized in that the flat strip (7) has a diffusion-equivalent air layer thickness sd = µ.s of 0.09-0.25 m, where µ is the water vapor diffusion resistance number and s is the sample thickness. 6. Joint cover according to claim 4, characterized in that the flat strip (7) has elevations 21 on the underside. 7. joint cover according to claims 4-6, characterized in that the flat strip (7) is a flexible band which has additional reinforcements.

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