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Attic Insulation

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Posted by: from Pickering
10/30/2011 at 12:29:17 PM

How much blown cellulose attic insulation is required - i.e. depth of insulation?

REPLIES (1)
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Date/Time10/30/2011 at 1:58:14 PM

Hi Chuck, in general there is no such thing as too much insulation. You should get an energy audit done and it will tell you how much insulation needs to be added to qualify for rebates. They want a minimum of R51. If this is a new build, you would probably want about 18" of cellulose to ensure adequate coverage after settling. As you can imagine, when you blow in this much insulation it goes everywhere - including into your soffits. For this reason, you must ensure the baffles are extended up enough to allow the roof to continue to breath. You should also insulate your attic hatch to the same R value as the attic. This can be done by building up the curb around the opening to the height of the cellulose, cutting blue or pink rigid to fit the hatch fairly tightly (could be up to 12" high) and applying a weather stripping on the ledge that the hatch sits on.

You should post your requirements in the projects area so you can get some local contractors out to see your situation.

Good Luck!

Jim Kuzma

Kettleby Handyman Services

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