Sagging sheathing over decent shingles

Old 06-18-04, 06:52 PM
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Question Sagging sheathing over decent shingles

I am buying a house in PA (near philadelphia) that was built with 3/8" sheathing on 16" centers. The sheathing is generally sagging a little all over but in one place it is very weak. It is a colonial style home with an upper and lower roof. The shingles are only about 8 years old. There are no current or previous apparent leaks.

1. Can I tear off the shingles and put 1/2" sheathing on top of the existing sheathing? I would obviously do this to the whole roof not just the really bad place.

2. Would OSB be appropriate for this job?

3. Are there any things that I need to think about as a result of having increased the thickness of the roof surface? (flashing, drip edge, etc.)

Thanks in advance for your comments.

Last edited by kelleyphd; 06-18-04 at 08:03 PM.
Old 06-18-04, 08:09 PM
Hellrazor's Avatar
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PA just passed the new statewide building code, i am not sure if adding a second layer of plywood meets code or not.
Old 06-21-04, 11:53 AM
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Like said call and check code for where you are.
If you do add on you could just add on a new fascia board over the old one and come up higher to match the new roof edge. Then the standard metal drip edge should work.


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