How To Insulate Floor Joist Pockets

Have a question about insulating my rim joists in basement.

How to insulate floor joist pockets.

If you have an unfinished basement you can properly insulate the rim joists in two or three hours. This may be a bit long so bear with me. Use a box cutter to cut the insulation to length. Sealing and insulating rim joists.

A merry christmas to everyone. Rim joists are above grade so it makes sense to insulate the joists to the same level as above grade walls. Have work shop and family room downstairs it seems to get chilly after. This is an effective method for air sealing this area while still being easy on the pocket book.

If the foam board is properly sealed additional fiberglass. At the rim joist area many building components come together the foundation wall the mudsill the rim joist the subfloor so it s also important to seal all cracks against air leakage. Properly insulating and air sealing rim joists band joists takes patience so most builders simply stuff in some fiberglass and walk away. On one side of my house where the joist runs parallel to the outside wall i insulated and put poly part way only but could not seal it because of a.

We live in michigan and its cold now even without the snow. I filled the pockets with insulation 2 pieces of fibreglass to total 5 5 inches thick then sealed the pockets with a piece of polyethylene. We have a ranch with a full basement and craw space. The pockets between the joists were not insulated.

Quite often basement perimeter foundation walls are framed insulated and covered with 6mil poly to the underside of the floor joists and loosely stapled in place between these pockets.