How To Insulate Floor Joist Pockets

Insulating rim joists pockets.

How to insulate floor joist 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. Sealing and insulating rim joists. 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. We live in michigan and its cold now even without the snow. If the foam board is properly sealed additional fiberglass. The pockets between the joists were not insulated.

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. Use a box cutter to cut the insulation to length. This may be a bit long so bear with me. 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. A merry christmas to everyone. If you have an unfinished basement you can properly insulate the rim joists in two or three hours. Have a question about insulating my rim joists in basement.

In better insulated situations these cavities are partially filled with high density foam or extruded foam pieces.