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OSB Question. Vs Plywood?

 
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Old 05-29-2009, 08:03 AM   #1
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OSB Question. Vs Plywood?


i am siding over some aspestas(spelling) with fiber cement board..i need a rigid surface so i simply cannot rely on insulation board.. someone reommended OSB ,either 1/4 or 7/16 to use over the existing shingles..
my question is how good is OSB for this type of application? how is it better or on par with plywood? i know if OSB is cut,it can be prone to water damage,however i will tyvel over it so cutting it will not be a factor?
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Old 05-29-2009, 08:05 AM   #2
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Re: OSB Question. Vs Plywood?


Quote:
Originally Posted by enforcer View Post
i am siding over some aspestas(spelling) with fiber cement board..i need a rigid surface so i simply cannot rely on insulation board.. someone reommended OSB ,either 1/4 or 7/16 to use over the existing shingles..
my question is how good is OSB for this type of application? how is it better or on par with plywood? i know if OSB is cut,it can be prone to water damage,however i will tyvel over it so cutting it will not be a factor?
OSB is just as strong as plywood but doesn't cost as much.

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Old 05-29-2009, 08:20 AM   #3
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Re: OSB Question. Vs Plywood?


how bout as wall sheathing? water ect...?
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Old 05-29-2009, 04:26 PM   #4
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Re: OSB Question. Vs Plywood?


Quote:
Originally Posted by enforcer View Post
i am siding over some aspestas(spelling) with fiber cement board..i need a rigid surface so i simply cannot rely on insulation board.. someone reommended OSB ,either 1/4 or 7/16 to use over the existing shingles..
my question is how good is OSB for this type of application? how is it better or on par with plywood? i know if OSB is cut,it can be prone to water damage,however i will tyvel over it so cutting it will not be a factor?
I would use either Advantech(OSB) or CDX fir plywood, 1/2" thickness. Advantech is very resistant to moisture and swelling, some OSB products are less resistant. Fir plywood, 4 and 5 ply is equally acceptable for this app.
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Last edited by loneframer; 05-29-2009 at 04:29 PM.
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Old 05-29-2009, 04:33 PM   #5
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Re: OSB Question. Vs Plywood?


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Originally Posted by enforcer View Post
aspestas(spelling)

Ok at some point you've just got to say to yourself, it's worth 30 seconds for me to hit the spell check button so I don't look like a fool.

Thanks for the laugh.
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Old 05-29-2009, 04:38 PM   #6
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Re: OSB Question. Vs Plywood?


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Originally Posted by enforcer View Post
how bout as wall sheathing? water ect...?
Follow manufacturers recommendations for spacing, (1/8" all sides,) regardless of whether you use plywood or OSB. I have used OSB on many homes and prefer OSB overall. Advantech is top dog in OSB in my opinion.
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Old 05-29-2009, 04:42 PM   #7
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Re: OSB Question. Vs Plywood?


Another vote for Advantech.
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Old 05-29-2009, 04:42 PM   #8
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Re: OSB Question. Vs Plywood?


are you using 1/2" OSB over the original siding he's talking about "loneframer"? 1/8' gaps?
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Old 05-29-2009, 04:52 PM   #9
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Re: OSB Question. Vs Plywood?


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are you using 1/2" OSB over the original siding he's talking about "loneframer"? 1/8' gaps?
Manufacturers recommend 1/8" spacing on all edges, I have practiced this for the last 12 years. Regardless of whether you use OSB or plywood, the gaps will close up to some degree with high relative humidity, sometimes to the point of non-existance. If it is not gapped it will bind and either pucker at the edges or "washboard" between studs. Same goes for T&G, always gap the edges.
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Old 05-29-2009, 04:57 PM   #10
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Re: OSB Question. Vs Plywood?


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Originally Posted by OGStilts View Post
Ok at some point you've just got to say to yourself, it's worth 30 seconds for me to hit the spell check button so I don't look like a fool.

Thanks for the laugh.
and the tyvel its cheaper than tyvek
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Old 05-29-2009, 07:56 PM   #11
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Re: OSB Question. Vs Plywood?


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Manufacturers recommend 1/8" spacing on all edges, I have practiced this for the last 12 years.


I have a neighbor who's a good guy, but also a four-eyed geek. He built his own house over a period of several years, researching each step and skill needed in excruciating detail. Somehow he missed that one.

He sheathed the house in plywood cut with micrometer accuracy and fitted so tightly together that you couldn't get a gnat's eyelash through the cracks.

Just about every single sheet wound up bulging like a bullfrog in full song. and he had to cut big X's in them to relieve the pressure.

Quote:
Advantech is top dog in OSB in my opinion.
Ditto, but I generally don't use it for wall sheathing. The cost is justified for floors that might catch a couple of rains before you're dried in, but walls don't usually get soaked during construction, and after you're done, they shouldn't be getting wet at all.
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Old 05-29-2009, 08:08 PM   #12
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Re: OSB Question. Vs Plywood?


my recommendation would be to use the cheap 7/16" osb-at less than $6/sheet, it's much more cost effective as compared to plywood/advantech.

what is the purpose of the wall sheathing-is it to keep the broken asbestos shingles in place after they break from being punctured with nails? If so, 7/16" is fine. If you're looking to make a nice flat surfce, the plywood may have more resilence to flexing (4ply vs 3ply)-if you've got money to burn that is. nail at the bottom of each shingle lap-nailing between the bottom of the lap and the top could introduce bowing in the sheating.
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Old 05-29-2009, 09:16 PM   #13
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Re: OSB Question. Vs Plywood?


Quote:
Originally Posted by OGStilts View Post
Ok at some point you've just got to say to yourself, it's worth 30 seconds for me to hit the spell check button so I don't look like a fool.

Thanks for the laugh.
I ran it through my spell check and my computer started smoking.
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Old 05-29-2009, 09:23 PM   #14
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Re: OSB Question. Vs Plywood?


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Originally Posted by Tinstaafl View Post


Ditto, but I generally don't use it for wall sheathing. The cost is justified for floors that might catch a couple of rains before you're dried in, but walls don't usually get soaked during construction, and after you're done, they shouldn't be getting wet at all.
That is just one of the reasons that I sheath my walls after standing, usually just before starting the roof framing. BTW, I used 7/16 OSB on the walls of my own home, plywood on the floors and roof.
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Old 05-29-2009, 09:25 PM   #15
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Re: OSB Question. Vs Plywood?


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Originally Posted by 72chevy4x4 View Post
my recommendation would be to use the cheap 7/16" osb-at less than $6/sheet, it's much more cost effective as compared to plywood/advantech.

what is the purpose of the wall sheathing-is it to keep the broken asbestos shingles in place after they break from being punctured with nails? If so, 7/16" is fine. If you're looking to make a nice flat surfce, the plywood may have more resilence to flexing (4ply vs 3ply)-if you've got money to burn that is. nail at the bottom of each shingle lap-nailing between the bottom of the lap and the top could introduce bowing in the sheating.
I agree with everything stated in the above post.

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