Is this a silly question?

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  #1  
Old 07-12-01, 02:33 PM
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I am doing an attic convertion to an old house that has 2x4 rafters.
Is there some insulation material out there that will fit, or is there something else I can do without having to replace the rafters?
 
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Old 07-12-01, 02:40 PM
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Re: silly

I forgot to add that city code here requires at least R-30.
I've heard of some kind of foam that would fit into a six-inch cavity, but it doesn't leave any room for air circulation. I'm trying to keep a vaulted ceiling.
To get to a six-inch space, I would have to sister 2x2s onto the 2x4s. Is this kosher? And what would I do about space for air exchange?
What else can I do?
 
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Old 07-14-01, 03:25 AM
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Polyurethane boardstock will give you an insulation factor of R6 per inch, requiring 5 inches to give you minimum code requirements. You should build-up the 2x4's to leave at least a 2" air space above the insulation, ensure the soffitts are open & use a ridge cap vent.
 
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