Vapor barrier for use in the heat insulation of buildings
AssigneeFraunhofer Gesell. Zur Foerd. Der Ang. Fors. 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.
Claims33
A vapor barrier for use in the insulation of buildings, wherein at least a portion of the vapor barrier is formed from a material which has a water vapor diffusion resistance dependent on an ambient humidity, with the proviso that the material, at a relative humidity of an atmosphere surrounding the vapor barrier in the region of 30% to 50%, has a water vapor diffusion resistance (sd-value) of 2 to 5 meters diffusion-equivalent air space width, and, at a relative humidity in the region of 60% to 80%, a water vapor diffusion resistance (sd-value) which is <1 meter diffusion-equivalent air space width.
A vapor barrier for use in the insulation of buildings, at least a portion of the vapor barrier formed of a film including a material selected from the group consisting of polyamide 6, polyamide 4 and polyamide 3.
Dependencies are inferred from the claim text.