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Old 03-13-2012, 06:44 PM   #1
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Trying to learn about my roof


Believe I have a roof that has no exterior sheathing? Exposed beams and cedar ceilings inside, 2"? foam above with shingles on top of foam. Obviously no venting. Occasional small leaks that I believe ate condensation rather than compromised shingles.
Is there a name for this design?
Where can I learn more about it?
Sooner rather than later I (with pro roofer) will be doing a tear off, new ice damming and shingles, I'd like to know the best way to handle and/or improve this roof...
Thanks

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Old 03-13-2012, 07:08 PM   #2
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Trying to learn about my roof


Not likly there's just foam and nothing under it.
Far more likly there's 1-1/2 T & G Cedar with foam over it. Or SIP's then the shingles.
If these are cathedreal ceilings it's commmon to insulatate with foam on the outside instead of the inside.

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Old 03-13-2012, 07:11 PM   #3
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That's correct there is T&G cedar under the foam. That is what makes up my cedar ceiling.
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Old 03-13-2012, 07:12 PM   #4
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I would call it a sloped roof with an exposed structure. Chances are there is something more above the insulation for the shingles to nail onto.

I would look into a 'ventilated nail base' like so http://www.atlasroofing.com/tabbed.php?section_url=51
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Old 03-13-2012, 10:00 PM   #5
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I'm thinking that ice damming wouldn't be an issue on that type of roof. Perhaps some roofers will chime in on that aspect.
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Old 03-14-2012, 08:01 AM   #6
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Quote:
Originally Posted by Missouri Bound View Post
I'm thinking that ice damming wouldn't be an issue on that type of roof. Perhaps some roofers will chime in on that aspect.

More people have issues with condensation in these un-vented designs.

Ice damns are certainly a potential with the right conditions as these roofs are never done properly and have enough insulation in them.

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