Rigid Insulation Between Floor Joists

Cut rigid foam insulation into strips with a table saw or a circular saw. The insulation should press right up against the floor between joists. When the basement or crawl space has vents installed insulating joist bays.

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Instead of installing the foam insulation between floor joists in the crawl space the foam board is installed against the crawl space foundation walls.

Rigid insulation between floor joists.

This method can be hundreds of dollar less than the cost of using the commercially applied spray foam. Run a bead of acrylic caulk around each section of foam to form an airtight barrier. How to finish a basement. Fill gaps larger than 1 4 in.

Unlike fiberglass rigid foam insulation does not absorb water support mold or allow air to pass through providing that joints between boards are sealed with tape. Joist bays the open spaces between floor joists are prime hosts for insulation under specific circumstances. Seal and insulate using rigid foam board insulation. Gaps between the insulation and the floor can lead to inefficiency and heat loss.

A do it yourself friendly method for sealing and insulating the rim joist or band joist area is to use rigid foam up against the rim joist. The fiberglass will also need to be secured in place using wire mesh twine wood laths or other securing methods which can be an intensive project that adds to the overall cost. Cut the strips to fit between floor joists using a box cutter.

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