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Old 03-09-2008, 06:45 PM   #1
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double layer decking


i want to redo my roof with architectural shingles. the decking is 3/8 thick. would it be o.k. to install 7/16 o.s.b. over it ?do i use clips?

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Old 03-09-2008, 08:42 PM   #2
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double layer decking


NO!

You will too likely miss the rafters when nailing it in. The wood will pop up and buckle all over within a few short years.

In 24 years, I have run into this only 4 times doing tear-offs and each time the cost of the re-do jumped up dramatically and the decking was loose al over the place.

I doubt that code would approve of it, even though it may not specifically be addressed in the way you stated it.

Do it right to save the expense of having to re-do it again for alot more money.

Ed

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Old 03-09-2008, 08:50 PM   #3
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double layer decking


[quote=Ed the Roofer;105946]NO!

You will too likely miss the rafters when nailing it in. The wood will pop up and buckle all over within a few short years.

In 24 years, I have run into this only 4 times doing tear-offs and each time the cost of the re-do jumped up dramatically and the decking was loose al over the place.

I doubt that code would approve of it, even though it may not specifically be addressed in the way you stated it.

Do it right to save the expense of having to re-do it again for alot more money.
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Old 03-09-2008, 08:51 PM   #4
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double layer decking


o.k. thats not what i wanted to hear. so what do you recommend for decking for 2x4"s on 24" centers?
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Old 03-09-2008, 09:23 PM   #5
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double layer decking


Some of the codes around the towns I work in allow 1/2", but if you go that route, use the 4-ply instead of the 3-ply. For a few buck more, upgrade to 5/8" or 3/4" and the deck won't bounce at all, especially at 24" oc.

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