Insulating vaulted or cathedral ceiling in upper story and a half home

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Posted by: from Sudbury
3/8/2017 at 9:25:45 AM

I am renovating a home, currently removed all drywall in the upper story and a half. Cathedrial, True 2x4 construction, 16" centers. They had craft faced insulation directly against the roof sheathing, I have removed all and looking for the best solution to replace and create the necessary ventalation.

I was considering roxul product, which requires 3", leaving me with just under an inch for ventalation. I cannot purchase a baffel that his 1", considering making my own with 1/4 inch SM??

Thoughts or suggestions please.

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Date/Time3/8/2017 at 12:01:08 PM

I would look into 3 lb spray foam professionally sprayed insulation. It will provide the vapor seal and a higher insulation value.

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Jacques from Stellium Renovations in Montreal
Date/Time5/3/2017 at 6:38:57 PM


All roofs must accomplish a number of different objectives. They must look good, protect the interior from the cold outdoors, and trap the heat inside to avoid deteriorating the roof and its coverings.Have you considered adding wood to the edge of the rafters to increase ther depth? That way you could install additional insulation in the cathedral roof and still maintain adequate ventilation. There are a lot of homes in my neghborhood with cathedral ceilings and as a rule their shingle roofs wear out very fast due to heat loss. The investment of increasing the framing height could well be offset by lowered heating/cooling costs and lonegr roofing life.

Hope this helps

Jacques Bouchard

Stellium Renovations

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