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Old 04-28-2007, 03:41 AM   #16
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Sheathing over existing sheathing question

Originally Posted by Ed the Roofer View Post
Check out this link. It is a California building department code, but it seems to be very precise.

I love this line in that document:
Dry tot, broken, or termite damaged roof sheathing and framing members shall be removed and

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Old 04-29-2007, 07:52 PM   #17
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Sheathing over existing sheathing question

I don't understand why he just doesn't remove/replace the few bad sheets. After seeing your climate loaction, I would be concerned about creating a moisture trap between the layers, as the glue in the existing plywood creates a vapor barrier technically. If you have warm air leakage into the attic, and it reaches the cold sheeting, there is going to be the potential for condensation. IMO this does not sound like something I would want.

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