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Old 04-12-2014, 03:20 AM   #1
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Uninsulated vaulted ceiling

I've been doing quite a bit of reading lately, and I cant seem to find any posts with my situation. I have a mid 50's house in western Washington that I am starting to believe was originally a cabin with multiple add-ons. I am curious the correct way to insulate the vaulted ceiling. It is currently T&G 2x6 covered with plywood and shingles. Thats it... Zero insulation. Zero "cavity" to add insulation. How to proceed?


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Old 04-12-2014, 03:21 AM   #2
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Uninsulated vaulted ceiling

Its somewhat hard to explain, but I was thinking of "building down" the ceiling with 2x6's and filling the new cavity with rigid foam insulation. Hot roof design. Is there any issues with this plan?

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Old 04-13-2014, 07:33 AM   #3
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Uninsulated vaulted ceiling

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Old 04-13-2014, 12:52 PM   #4
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Uninsulated vaulted ceiling

How big a square footage?

Easier to do from the top down to be honest and better performance.
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Old 04-15-2014, 10:25 PM   #5
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Uninsulated vaulted ceiling

How far apart are the rafters?

For your location, R-38 is required in a vaulted ceiling; pp 26, Zone 4C; https://www.google.com/url?sa=t&rct=...MaBQkw&cad=rja

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