How to Stop Cold Air Coming Up From a Crawl Space

Crawlspace Vents

• 1

  Check all of the crawlspace vents. All of the vents should be able to open and close either automatically or manually.

• 2

  Remove and replace damaged or inoperative vents. Remove the screws attaching the vent to the crawlspace wall by turning them counterclockwise with a screwdriver. Pull out the old vent. The vent may also be attached with silicone caulk. Remove the caulk with a razor blade.

• 3

  Apply an even bead of caulk around the back of the vent and push the new vent into place. Secure the new vent to the wall using new screws. Usually, the vents should be open during the summer and closed during the winter.

Insulation

• 4

  Cover the entire floor of the crawlspace with 6-mil plastic, starting at the top corner of the crawlspace. Tape all joints together, and secure the plastic to the top of the crawlspace using screws or a staple gun.

• 5

  Cut insulation to fit the crawlspace wall. The wall should be covered from crawlspace floor to crawlspace ceiling. This will help create a barrier to the cold air on the outside and help keep more warm air inside.

• 6

  Check the crawlspace for additional uninsulated spaces and air leaks.