INSULATION SYSTEM WITH VARIABLE POSITION VAPOR RETARDER

摘要

A method for positioning a vapor retarder within an insulation system to reduce condensation within the insulation system is provided. The incremental chang e in temperature per R-value of insulation is calculated by determining the temperature differential between the exterior temperature and the interior temperature a nd dividing this temperature differential by the R-value of insulation. Various possible temperatures for the vapor retarder within the insulation may be determined using the incremental change in temperature. The R-values of the insulation layers on either side of the vap or retarder may be determined by a condensation potential analysis. Preferably, the vapor retarder is positioned within the insulation system at a location where its temperature remains above the interior dew point temperature in the summer and above the exterior dew point temperature in the winter. An insulation system including a variably positioned vapor retarder is also provided.