Wednesday, November 24, 2010

Basement Floor Insulation and Vapor Barrier

Once the plumbers set their main drains and the electricians laid a few key lines, the basement was prepped for its forthcoming concrete slab. This involved grading the dirt level, applying a continuous layer of polyethylene sheet, sealed at the curbs and outer walls with acoustical sealant and tuck tape, and finally adding 65mm rigid foam insulation. Below is a cutout view of the system. Look closely to the moisture which has condensed on the underside of the poly.Care taken during these steps will completely block the transfer of water vapor from the soil into the basement slab, leaving a warm and dry basement for good.

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