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Old 02-18-2012, 12:19 PM   #1
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OSB vs plywood


is osb still an unsafe product to use as roof decking.

have a new project and a renovation. metal roofing to cover.

ty.

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Old 02-18-2012, 12:23 PM   #2
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OSB vs plywood


What type metal roofing are you using?

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Old 02-18-2012, 12:59 PM   #3
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OSB vs plywood


You can use OSB But I love plywood.
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Old 02-18-2012, 02:02 PM   #4
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OSB vs plywood


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Originally Posted by zeekdafreek
is osb still an unsafe product to use as roof decking.

have a new project and a renovation. metal roofing to cover.

ty.
OSB was never an un-safe product, was it?

Oh. You were laughing about that. Must be some inside joke or something.
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Old 02-18-2012, 02:09 PM   #5
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OSB vs plywood


With some metal roofing you do use a soild sheathing under it that's why I asked.
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Old 02-18-2012, 02:28 PM   #6
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With some metal roofing you do use a soild sheathing under it that's why I asked.
Yeah, I've put solid sheeting under metal. And concrete and clay tile, which was weird, I thought.
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Old 02-18-2012, 02:32 PM   #7
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OSB vs plywood


Looks like it may be just another of the one hit wonders.
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Old 02-18-2012, 02:55 PM   #8
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OSB vs plywood


using osb when putting down metal is a no no the screws wont hold over time and will back out are become weak over time due to the fact there is no holding power with osb.


if you are going to use a standing seem and need a solid deck then i would use no less than 1/2 plywood.

if you are going to use a ribbed metal then plywood are strapping
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Old 02-23-2012, 07:02 AM   #9
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Originally Posted by r00ferguy View Post
using osb when putting down metal is a no no the screws wont hold over time and will back out are become weak over time due to the fact there is no holding power with osb.


if you are going to use a standing seem and need a solid deck then i would use no less than 1/2 plywood.

if you are going to use a ribbed metal then plywood are strapping

thanks. that makes a lot of sense.
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Old 02-23-2012, 07:04 AM   #10
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and i appreciate it.

Last edited by zeekdafreek; 02-23-2012 at 07:06 AM. Reason: error
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Old 02-23-2012, 07:23 AM   #11
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OSB vs plywood


Real wood planks make a better deck. It's on record as lasting 100's of years. Gaps don't affect it either.
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Old 02-23-2012, 08:42 AM   #12
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Real wood planks make a better deck. It's on record as lasting 100's of years. Gaps don't affect it either.
That's a fact!!!

In regards to gaps however up here in MN we have to deck over planked board with gaps greater than 1/2in. The city requires a solid nailable surface as does the shingle manufacturer. In the past we've gone over roofs without redecking with 1/4in gaps and every now and then you'll end up with a whole row you have to nail high in order to bite into wood.

I feel the best deck material out there is tounge and groove.

We did a tear off last Fall with T&G were the installers didn't push them together. We ended up having to do a deck overlay since the seams were not strong enough to support nails.

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