Spray Foam Insulation Crawl Space Dirt Floor

While spray foam insulation is one of the most effective insulation materials in other rooms of the home it is a bad idea in a wet or damp crawl space. Applying spray foam to the dirt floor of your crawlspace may be one of the easiest and most effective solutions and if so then you would be best not to insulate the joists over your head and just heat that space instead. Retrofoam of michigan has been insulating crawl spaces with foam insulation for more than 15 years.

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If you would like to keep your crawl space vented because you live in a low humidity environment we recommend insulating the crawl space floor with fiberglass or rock wool mixed with spray foam for air sealing.

Spray foam insulation crawl space dirt floor.

When we insulate the walls of the crawl space we lay down plastic over the dirt floor that is a vapor barrier. This will give you the thermal barrier between the crawl space and your living space as well as help keep the air from getting from the crawl space into the living space. When you re using fiberglass batting insulation material run it about 6 inches or so onto the crawl space floor. This is the technique we use when insulating a crawl space with a dirt floor.

You could also use batt insulation but don t. Cut pieces of insulation just large enough to fit along the rim joist the framing material into which all the floor joists are nailed. 7 reasons you should use spray foam insulation in your crawl space spray foam insulation gets into even the smallest cracks which thoroughly blocks air flow from the outside. Because the air flow is completely blocked this eliminates one of the ways pollen gets into your home.

The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. Applying spray foam to the dirt floor of your crawlspace may be one of the easiest and most effective solutions and if so then you would be best not to insulate the joists over your head and just heat that space instead. Moisture gets easily trapped between the foam and the wall and a moist foundation wall generally leads to mold growth and wood rot. To insulate the crawl space i would use a closed cell two pound 907 gram spray foam because it will act as both your vapour barrier and insulation.

This means no more drafts under your home and no more cold floors.

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