How To Insulate A Crawl Space With A Dirt Floor

In this instance we focused on foil faced r 13 insulation on.

How to insulate a crawl space with a dirt floor. In this video home renovation brothers dave and rich demonstrate how to insulate a crawl space. When you re using fiberglass batting insulation material run it about 6 inches or so onto the crawl space floor. 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.

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. Aim for as few seams as possible by installing large sheets of foam. Seal seams between the boards with the pvc tape.

Department of energy recommends r 11 3 insulation under floors in warm climates and an r 25 6 to 8 in cold climates. Fiberglass insulation batts or rolls are the most economical and easiest diy choice for insulating between the floor joist in a crawl space. Unless there are excessive moisture problems in the crawl space use unfaced fiberglass batts to insulate the walls.

Cover the walls with insulation from the sill plate to the plastic covered dirt floor. 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. Insulate the crawl space walls.

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. You could also use batt insulation but don t. 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.