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Roofing plywood

Posted by hrajotte (My Page) on
Mon, Mar 25, 13 at 8:30

I need to re-shingle my shed roof, which will also entail replacing 3 rotting plywood sheets.
Is there a particular type of plywood used for roofing, or can I just use standard 4' x 8' panels? (Haven't measured the thickness yet, but looks like 5/8" or 3/4")
Is it acceptable (or desirable) to screw the plywood to the rafters (2x4's) instead of nailing it?
Should there be some type of underlayment before shingling? Currently, the shingles are mounted directly to the plywood, and they lasted 25 years.


Follow-Up Postings:

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RE: Roofing plywood

CDX or OSB is exterior sheathing normally used. Match the thickness that was used originally (probably 1/2"), then minimum of 15# felt then the roof shingles.


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RE: Roofing plywood

1/8 in gap between sheets.


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RE: Roofing plywood

Yes, good point brick and thanks for picking me up!


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RE: Roofing plywood

Many thanks for your advice!


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RE: Roofing plywood

The thickness of the sheathing depends on the spacing of the rafters and you didn't tell us that so I would recommend at least 5/8" CDX plywood or Oriented Strand Board.

Asphalt saturated felt (building paper) underlayment once weighed 15 lb per 100 s.f. but it is now much lighter and therefore called No. 15. To match the original standard it is necessary to use No. 30 building paper.

The shingles may have lasted 25 years but obviously they did not protect the sheathing so the design was inadequate possibly because of a low slope. If you want the roofing and sheathing to last another 25 years install an underlayment of self-adhering Ice & Water Shield from Grace without substitution.


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RE: Roofing plywood

A little overkill in my mind for a shed, Reno.


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RE: Roofing plywood

Making a building last more than 25 years is not overkill to me.


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RE: Roofing plywood

"Making a building last more than 25 years is not overkill to me."

Depends on how large it s.

Not everything needs to have a long life.


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