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Old 07-27-2007, 09:00 PM   #1
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Which thickness plywood for small roof?


What thickness plywood would you use for a small roof. It's for my portico entry rebuild and the dimensions of the sheathing are 4'x6' on each side including a 12" overhang on the eves and gable end.
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Old 07-28-2007, 06:46 AM   #2
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Which thickness plywood for small roof?


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What thickness plywood would you use for a small roof. It's for my portico entry rebuild and the dimensions of the sheathing are 4'x6' on each side including a 12" overhang on the eves and gable end.
Thanks

1/2" CDX....NOT OSB

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Old 07-28-2007, 10:40 AM   #3
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Which thickness plywood for small roof?


Additionally, depending on the rafter spacing, either 12", 16", or 24", the panel thickness may be determined by your local code department depending on how much live load and dead load performance criteria you must be capable of meeting in your area.

A good site for thatinformation is the, Engineered Wood Products Association, also know as the APA, American Plywood Association, which now-a-days encompasses much more than just plywood.

Ed

Last edited by Ed the Roofer; 07-28-2007 at 01:32 PM.
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Old 07-28-2007, 11:58 AM   #4
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Which thickness plywood for small roof?


Thanks Atlantic and Ed,
Fortuneatly Atlantic is in my area so I can count on him to site codes for Massachusetts.
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Old 07-28-2007, 12:39 PM   #5
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Which thickness plywood for small roof?


Just a reminder to install the rough side UP on the CDX. It gets pretty slippery otherwise.
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Old 07-28-2007, 01:11 PM   #6
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Which thickness plywood for small roof?


Taking time off while waiting out a passing shower. I didn't know there was a rough and smooth side. Thanks for the heads up.
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Old 07-28-2007, 01:39 PM   #7
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Which thickness plywood for small roof?


Here is the main link for the APA. It has some very useful publications, which require a free registration to be able to download the PDF files.

http://www.apawood.org/

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Old 08-01-2007, 09:04 PM   #8
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Which thickness plywood for small roof?


1/2" cdx for 16"on center rafter spacing,3/4" cdx for 24"on center rafter spacing

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