How To Insulate Floor Joist Pockets

We live in michigan and its cold now even without the snow.

How to insulate floor joist pockets.

Have work shop and family room downstairs it seems to get chilly after. 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. 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. Use a box cutter to cut the insulation to length.

We have a ranch with a full basement and craw space. 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. If the foam board is properly sealed additional fiberglass. A merry christmas to everyone.

This is an effective method for air sealing this area while still being easy on the pocket book. The pockets between the joists were not insulated. In better insulated situations these cavities are partially filled with high density foam or extruded foam pieces. Have a question about insulating my rim joists in basement.

If you have an unfinished basement you can properly insulate the rim joists in two or three hours. Insulating rim joists pockets. Sealing and insulating rim joists. Properly insulating and air sealing rim joists band joists takes patience so most builders simply stuff in some fiberglass and walk away.

In cold humid or mixed climates the foam board thickness needs to be 2 thick to stop the condensation in the rim joist area.