How to insulate a crawl space with foam board. Measure the width and length of the crawl space itself not the walls. The boards provide protection against the intrusion of water at the same time as protecting against the transfer of hot and cold temperatures. Seal seams between the boards with the pvc tape.
Measure the width and height of each wall in the crawl space. Foam board insulation is attached directly to the exterior structure walls of the crawlspace. Cut rigid foam pieces to size with the saw and attach the pieces to the inside crawl space walls with the latex adhesive.
Aim for as few seams as possible by installing large sheets of foam. This effectively insulates the crawl space itself as opposed to insulating the home from the air in the crawl space.
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