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Old 01-12-2010, 03:10 PM   #1
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Log Cabin Cathedral Ceiling

I am looking for some ideas on how to insulate a ceiling in a log cabin. There is some insulation on the top side (R15) but I am thinking of adding insulation on the underside. Because the house is over 80 years old, I'd like to keep the appearance and also keep the weight on the ceiling down. I am thinking of having spray foam insulation installed and then installing ceder boards on top of it. I would probably have to install 2X6 ceder boards beside the balsam rafters to get a straight surface to attach the cedar boards to .

Anyone got any other ideas?
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Last edited by DCJH; 01-12-2010 at 03:20 PM.
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Old 01-12-2010, 05:58 PM   #2
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You might be better off adding a 'cold roof' on top of the existing.
That would save your 'heritage' design of this building.

horizontal strapping, then add a new 'rafter system' above the strapping, insulate from the top leaving an air space, sheet, shingles, fascia, ridge vent, done. vent the fascia, of course.


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Old 01-13-2010, 11:48 AM   #3
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external roof

Thanks for the suggestion, but I have already installed a upper roof with special 2" (R15) fibreboard insulation. (Most people are not familiar with this stuff. It's like a hard fibreglass-type of 4X8 sheet..usually used in flat roof construction under tar.) On top of the roof is a Tough-Lok steel roof (50 yr warantee) that costs an arm and a leg but looks like cedar shake.
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