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Crawl Space Insulation

Spray Foam Insulation - Cost Effective and Long Lasting

Insulating the 'ceiling' of the crawl space with fiberglass batts has been the unchallenged standard for a number of years. However, due to crawl space moisture and gravity, homeowners often find themselves in the crawl space about every 5-7 years spending more time and money replacing the batts. With the cost of spray foam insulation being drastically reduced over the last decade, insulating the foundation walls rather than the floors joists has become a much more effective option. The foundation wall is much less surface area to cover than insulating the floors.


Standard Rancher: 26ft wide x 52ft long (3 Blocks/2ft tall)

Fiberglass Batts: 26ft x 52ft = 1352 sqft of floored area to insulate

Spray Foam Insulation: 152 linear feet of wall x 2ft tall = 312 sqft of wall area of insulate

Net: 1352 sqft - 312 sqft = 1040 sqft less to insulate


The biggest opposition when it comes to utilizing spray foam insulation, is how to handle the crawl space vents. With the Eastern Shore of Maryland being prone to flooding and tidal surges, most homeowners insurance require louvered flood vents that can open and close as needed during intense storms or flooding. In this case, the crawl space vents are sealing from the inside with foamboard, providing an air tight seal yet in the event of a flood, the water pressure simply pushes away the foamboard and allows the free flow of water under the house to prevent structural damage.

Crawl Space Spray Foam Insulation



Getting to Know Your Crawl Space | Crawl Space Moisture | Dirt Crawl Space | Wet Crawl Space | Crawl Space Drainage | Sump Pumps | Crawl Space Ventilation | Crawl Space Insulation | Crawl Space Air Sealing | Crawl Space Dehumidifer