Insulation element for a flat roof or a flat inclined roof, roofing system for a flat roof or a flat inclined roof and method for producing an insulation element

1. An insulation element for thermal and/or acoustic insulation of a flat roof or a flat inclined roof, comprising:

a first layer made of mineral fibres, especially stone wool fibres,

a second layer made of at least one fabric, especially a fleece being impregnated,

whereby the second layer is fixed to a major surface of the first layer by an adhesive,

wherein

the second layer is impregnated with a filler and

the second layer in combination with the filler has a permeability allowing hot air gases to pass through the second layer and closing the second layer for the penetration of a glue or adhesive in the direction to the first layer.

2. The insulation element according to claim 1 , wherein the fleece is made of glass fleece especially a glass fleece having an area weight between 40 g/m 2 to 80 g/m 2 , preferably between 55 g/m 2 to 65 g/m 2 .

3. The insulation element according to claim 1 , wherein the filler is an inorganic filler, especially lime.

4. The insulation element according to claim 2 , wherein the glass fleece contains a water repellent agent.

5. The insulation element according to claim 1 , wherein the adhesive contains an emulsified hydrophobing agent.

6. The insulation element according to claim 1 , wherein the adhesive is a pure PUF binder, especially with added silane.

7. The insulation element according to claim 1 , wherein the first layer comprises at least two layers of different densities whereby the layer with the higher density is connected to the second layer.

8. A roofing system for a flat roof or a flat inclined roof comprising at least one insulation element according to claim 1 , a substructure carrying the insulation element and a cold gluing roof membrane being fixed to the surface of the insulation element carrying the second layer with the filler.

9. The insulation element according to claim 1 , wherein the second layer in combination with the filler has a permeability between 250 m/h and 750 m/h, preferably between 400 m/h and 600 m/h, even more preferred of 500 m/h according to DIN EN ISO 9237 at dP of 200 Pa and on a test area of 20cm 2 .

10. The insulation element according to claim 1 , wherein a surface of the insulation element is fixed to a cold gluing roof membrane.

11. A method for producing an insulation element for thermal and/or acoustic insulation of a flat roof or a flat inclined roof, comprising;

providing a first layer made of mineral fibres, especially stone wool fibres;

providing a second layer made of at least one fabric, especially a fleece being impregnated; and

fixing the second layer to a major surface of the first layer by an adhesive, wherein the second layer is impregnated with a filler, and the second layer in combination with the filler has a permeability allowing hot air gases to pass through the second layer and closing the second layer for the penetration of a glue or adhesive in the direction of the first layer.

12. The method of claim 11 , wherein a second layer of a fleece is coated with a filler and the second layer with the filler is adhered to the first layer by an adhesive.

13. The method of claim 12 , wherein the insulation element is cured in an oven after the second layer is adhered to the first layer.

14. The method of claim 12 , wherein an emulsified hydrophobing agent is added to the adhesive being applied to the second layer.

15. The method of claim 11 , wherein the second layer in combination with the filler is used having a permeability between 250 m/h and 750 m/h, preferably between 400 m/h and 600 m/h, even more preferred of 500 m/h according to DIN EN ISO 9237 at dP of 200 Pa and on a test area of 20 cm 2 .