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Old 07-02-2013, 09:29 AM   #1
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roof underlayment plywood


I'm replacing a roof and after removing the shingles I discovered the decking is the old formwork for the basement (constructed in 1955), there are many areas of delamination and it is weak and flexible in a Lot of areas. What is the best fix? I'm considering putting a layer of 1/4" plywood over the entire surface or just using a heavier underlayment like an Ice and Snow Shield over the entire thing. Suggestions Please.
Thanks,
Tom

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Old 07-02-2013, 10:21 AM   #2
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If it's that bad it gets removed and replaced not just covered over.
1/4" would do nothing.
A picture would be real nice.

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Old 07-02-2013, 11:57 AM   #3
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I completely agree with JoeC. Remove existing to rafters, correct any problems in rafters and clean them. Replace deck with 19/32 Fir plywood, nailed 6 inches on center on the ends and 12 inches on Center intermediate with 8d resin coated nails. Space sheathing 1/8th inch all around. Installing 1/4 inch is worthless and will actually cause more problems by pumping the nails out through the shingles.
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Old 07-02-2013, 01:27 PM   #4
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Thanks and DANG!
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Old 07-02-2013, 01:55 PM   #5
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Quote:
Originally Posted by Magrudet View Post
Thanks and DANG!
Better Dang now than Damn later.
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