How To Insulate The Floor Of Your Crawl Space

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

How to insulate the floor of your crawl space.

This type of crawl space also allows insulation with an r value of 19 installed in the floor joist if the crawl space and has a permanently installed dehumidifier. It is important to secure insulation and cover it with a vapor barrier in order to prevent moisture and the mold that often follows close behind. This type of insulation allows for conditioned air to be introduced into the crawl space. Fiberglass insulation batts or rolls are the most economical and easiest diy choice for insulating between the floor joist in a crawl space.

The sill plate is the first piece of framing lumber and it runs on top of the crawl space wall. That way plumbing pipes and hvac ducts are protected from freezing temps helping to conserve energy. My house has an x board support in the floor joists for support. Install an air and vapor barrier over the floor and tape it to the insulation.

The idea is to condition the crawl space much in the same way that you might condition other parts of your home. No insulation on the ceiling of the crawl space. Use caulk or foam sealant to seal the joint between the top of the crawl space wall and the sill. In a cold climate the most efficient technique is to insulate the walls of your crawl space and close it off from the elements by sealing all air leaks.

Pairing silverglo with our terrablock padded floor insulation will keep out all outdoor air so your crawl space can stay warm in the winter and cool in the summer. Instead a better method is the multi pronged approach of insulating the inside walls of the crawl space with rigid foam laying down a plastic vapor barrier over the dirt floor then joining the two items with tape. It is my understanding the insulation goes on the walls of the crawl space as well as the floor of crawl space. Seal all vents and openings in your crawl space.

However the insulation needs to be treated with a fire retardant. If the crawl space is ventilated which is ideal because it aids in the elimination of moisture then fiberglass insulation can be easily installed under the subfloor between the floor joists. Department of energy recommends r 11 3 insulation under floors in warm climates and an r 25 6 to 8 in cold climates. John a cervo january 5 2018 at 8 08 am.