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hsmith

07:18PM | 04/09/01
Member Since: 04/08/01
2 lifetime posts
Bvhvac
I have a ranch with open beam cathedral ceilings throughout. The ceiling itself is 2x6 tongue and groove cedar planks. There's only a 3/4in fiber board between the ceiling and the roof. This winter was a killer from a heating point of view due to the increased cost of natural gas. Also my roof is failing so I might be stuck putting on a new one on. Since I'm replacing the roof, does it make sense to frame out an additional 6in stack on my roof to add insulation and venting at the time of reroofing. Apparently there are insulation planks, etc. that are used primarly for siding that advertise an r-value of 14. Could this be used in the described appliaction. I appreciate any help.

lt250ripper

03:24AM | 04/19/01
Member Since: 03/29/01
2 lifetime posts
hsmith:
Your type of cathedral ceiling is tough. The key to stopping heat loss is to seal it up and stop the heat from leaving the living space. When you tear the old roof off you should be able to seal up the sections above the ceilings easily. Keep the heat in the living space and it won't heat up the roof causing other problems; ie. ice dams, heat that stays in the room is money saved. I have seen roofing insulation planks like the ones you mention (like a plywood and foam sandwich) but haven't spoken to anyone to see how well they work. I would concentrate on stopping the air leaks and venting the roof properly (soffet to ridge). You want at least r38 over the ceiling area. Hope this helped feel free to email me if you have any questions. lt250ripper@yahoo.com

hsmith

05:42AM | 04/20/01
Member Since: 04/08/01
2 lifetime posts
Thanks for the advice. When the roof is off I'll have the sheathing sealed.
Currently I have ~R7(2" wood+3/4" insulation plank)in my ceiling/roof. I plan to add another R20 using a planking product by ATLAS that has a 3/4" vented cavity. It's not R38 but it will be 3x more than what I have today.

OFIC

01:03PM | 05/11/01
Member Since: 05/02/01
28 lifetime posts
When the roof is off, why not add either 3inch fiberglass batts with the planks you mentioned or a 6 inch fiberglass batt. Our house had 6 inch batts installed wbetween 2 X 8 rafters when built and it works well. We don't have ice here, just frost buildup but doesn't melt until the sun hits it so I know it is working.
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