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Basements & Crawl Spaces

Basements and crawl spaces are two of the most common areas that allow unwanted air flow and moisture and pests to enter a home. Touch ‘n Foam’s line of expanding foam sealants includes solutions for air sealing crawl space walls and ceilings, sealing gaps where sill plates and concrete foundations meet and insulting rim and band joist areas. Common symptoms and solutions include:


Basement Walls


 Basement walls are ideal places for cool air and moisture penetration.  


Spray a 1" layer of foam around the perimeter of the wall cavity and then apply a back fill layer of foam at 1" to fully enclose and air seal the space.

Crawl Space Spray Foam Image

Crawl Space Walls


Like basement walls, crawl space are ideal places for air and moisture penetration. Cool and warm air can permeate through stone or cinder walls.


Spray foam sealant at a 1" layer on a cross area of crawl space walls, adding additional 1" layers as necessary.

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Rim or Band Joists


Gaps can be found where rim joists cap the end row of joists. Air flow can occur where gaps exist.


Air seal gaps with a 1" layer of 2-component spray foam (1/2" wet spray will expand to 1") in these cavities. Install wool batting and a polyethylene vapor barrier.

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Sill Plate


Openings where sill plates and concrete slab foundations meet let in moisture, air and pests.


Apply 1" layer of spray foam along sill plate or apply foam sealant along gap between plate/foundation and sill. Slowly fill seam as you continue to move can along seam.

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HVAC/Plumbing/Electrical Penetrations


Gaps around air ducts, plumbing, electrical and phone/cable services create air gaps that allow air and pest infiltration.


Place foam sealant straw applicator or gun foam barrel into gaps and fill with foam sealant. Fill opening around penetraions, cables, ducts slowly to help block drafts.


Recommended Products

The 2-component polyurethane spray foam kits provide thermal insulating and sound attenuating benefits and are low pressure, permanent and dry within minutes of application.