| 摘要 |
1. Vapour barrier arranged next to the roof space for use in the heat insulation of buildings, characterized in that at least a portion of the vapour barrier is formed from a material which has a water vapour diffusion resistance dependent on the ambient humidity, with the proviso that the material, with a relative humidity of the atmosphere surrounding the vapour barrier in the region of 30% to 50%, has a water vapour diffusion resistance (Sd-valu) of 2 to 5 times diffusion-equivalent air space width; and, with a relative humidity in the region of 60 % to 80 %, a water vapour diffusion resistance (Sd-valu) which is < 1 times the diffusion-equivalent air space width. 2. Vapour barrier according to Claim 1, characterized in that the material is a film. 3. Vapour barrier according to Claim 2, characterized in that the film is chosen from polyamide 6, olyamide 4 or polyamide 3. 4. Vapour barrier according to Claim 2 or 3, characterized in that the film has a thickness of 10 μm. to 2 mm, preferably of 20 μm to 100 μm. 5. Vapour barrier according to Claim 1, characterized in that the material is a polymer coating applied to a carrier material. 6. Vapour barrier according to Claim 5, characterized in that the polymer for the polymer coating is chosen from polyvinyl alcohol, dispersed synthetic resin, methyl cellulose, linseed oil alkyd resin, bone glue or protein derivatives. 7. Vapour barrier according to one of Claims 1 to 6, characterized in that the material is applied as a coating to a carrier material with a low water vapour diffusion resistance. 8. Vapour barrier according to one of Claims 1 to 7, characterized in that the material is received like a sandwich between two layers of a carrier material with a low water vapour diffusion resistance. 9. Vapour barrier according to at least one of Claims 1 to 8, characterized in that the carrier material is chosen from a fiber reinforced cellulose material. |
