plywood vs osb


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Old 07-07-02, 11:31 PM
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plywood vs osb

It rains alot up here in seattle. I am going to do the roof myself and I wanted to know if the extra cost of plywood is worth it. I know everyone uses osb because it is cheaper but I am concerned about moisture swelling. opinions anyone?
 
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Old 07-10-02, 02:00 PM
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Cool

Hey pauly,
Down here in coastal North Carolina, where it is also very humid, most of the contractors use OSB in the field of the roof and plywood along the roof edges.
Plywood doesn't swell as badly when it gets wet, as OSB, and OSB will keep that swelling more.
Another thing to check is your local building code. I understand that some places now are not allowing OSB on the roof in case of fire (if it gets wet, fireman can fall through it).
Now, let some of the pros (I'm not one) give you their thoughts.
There have been discussions about OSB vs plywood in here, so you might want to do a search, also.
Good luck!
Mike
 
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Old 07-11-02, 07:13 PM
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Thanks for the info. I have also been told that OSB leeches a fair amount of formaldehyde. Any opinions on this?
 
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Old 07-12-02, 06:09 PM
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Sorry, I don't know about the chemicals in OSB.
All that I know is that it is made of hardwood chips mixed with chemical adhesives, heated and compressed.
Maybe one of the contractors here will know.
Good luck!
Mike
 
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Old 07-12-02, 09:03 PM
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Formaldehydes have been banned from building materials. The glues used in OSB may affect those with hypersensitivity, however the glue in plywood would also affect people with that allergy level.
 
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Old 07-13-02, 06:20 AM
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Lightbulb Old homes

You could use deck boards like the old homes did.

Yeah it would be $$$expensive$$$ but you wopuld NEVER have to worry about wood rot !!
 
 

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