Vapor barrier for use in the thermal insulation of buildings
AssigneeFraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
InventorsHartwig Kunzel, Theo Grosskinsky
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Abstract
The invention relates to a vapor barrier for use in the thermal insulation of buildings which can be used, in particular, for thermal insulation procedures in new buildings or in the renovation of old buildings. The vapor barrier in accordance with the invention is thereby capable of achieving water vapor exchange under different ambient conditions. This is achieved by using a material which has a water vapor diffusion resistance which is dependent on the ambient humidity and which also has adequate tensile strength and tear resistance.
Claims37
A water vapor exchange system for use in building insulation, comprising (i) a fiber insulation batt or fiber insulation slab, and (ii) a film comprising polyamide and having a water vapor diffusion resistance (sd-value) at a relative humidity of an atmosphere surrounding the vapor retarder in the region of 30% to 50% of 2 to 5 meters diffusion-equivalent air layer thickness, and, at a relative humidity in the region of 60% to 80% which is <1 meter diffusion-equivalent air layer thickness, wherein the film has a thickness of about 50 μm to about 100 μm.
An insulation system comprising (i) a fiber board suitable for use as a building insulation, a fiber insulation batt suitable for use as a building insulation or fiber insulation slab suitable for use as a building insulation, and (ii) a film comprising polyamide and having a water vapor diffusion resistance (sd-value) at a relative humidity of an atmosphere surrounding the vapor retarder in the region of 30% to 50% of 2 to 5 meters diffusion-equivalent air layer thickness, and, at a relative humidity in the region of 60% to 80% which is <1 meter diffusion-equivalent air layer thickness, wherein the film has a thickness of about 50 μm to about 100 μm.
An insulation system, comprising (i) fibrous insulation suitable for use in a building, and (ii) a film comprising polyamide and having a water vapor diffusion resistance (sd-value) at a relative humidity of an atmosphere surrounding the vapor retarder in the region of 30% to 50% of 2 to 5 meters diffusion-equivalent air layer thickness, and, at a relative humidity in the region of 60% to 80% which is <1 meter diffusion-equivalent air layer thickness, wherein the film has a thickness of about 50 μm to about 100 μm.
Dependencies are inferred from the claim text.