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Old 12-10-2008, 11:25 AM   #16
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Guidance for Insulating Slanted Ceilings - Cathedral Ceilings

Originally Posted by mdlorenz View Post
I had a thought...

What if I stapled up those baffles the whole run of the roof, from the soffit up to the open attic space, & then foamed it all... That'd get me the most r-value & still maintain the air space....
This was one of the options I read about in my research on knee walls last weekend. The general concensus was that you needed 2" underneath the sheating.

Googled "sheathing knee walls" for some very informative sites. I think you'd be interested in seeing the illustrations in this pdf.


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Old 12-12-2008, 12:30 AM   #17
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Guidance for Insulating Slanted Ceilings - Cathedral Ceilings

Baffles are ok. I have done some.

I like the method of nailing 1x2's to the top of the rafters and then nailing 1/4" whatever to them to make a backstop to spray to. I bet (I havent tried tis yet) polystyrene board would work well for this purpose, too. Then spray to that.

Air space
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Old 09-02-2009, 11:05 AM   #18
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Guidance for Insulating Slanted Ceilings - Cathedral Ceilings

I found I have the same problem. I am considering putting 2x6 or 2x8 on edge perpendicular to the rafters, over the existing drywall, insulating and putting up new drywall. Does this sound reasonable?


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cathedral ceiling , foam , foam board , insulation , slanted ceiling

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