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garyc 03-19-2011 07:14 PM

Insulating Sill Plate
Moved into older home, the sill plate has white foam board right now. Looking to insulate this year. The actual sill plate does not cover the top of the block completely, maybe half of it. We have the cavity of the blocks to contend with. What is the best way to insulate this? Should we liquid nail another board on top of the block then insulate or can we spray foam the cavity of the block as well?

HomeSealed 03-19-2011 08:48 PM

There are cheaper ways, but spray foam is phenomenal in this application.

garyc 03-21-2011 08:52 AM

Are you saying its ok to fill the holes in the top of the concrete blocks with the foam?

If we don't use the foam what would you suggest? There is no vapor barrier here, just 2 x on top of the concrete block?

HomeSealed 03-21-2011 09:02 AM

So the top course of block is open on the top?... If that is the case, you would waste a lot of material by filling every block with foam. Stick a piece of xps board in the hole to fill it, then spray over the entire sill box... To further minimize foam usage, you could cut pieces of xps to fit the whole sill box cavity, then just foam the perimeter of it to seal it.

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