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            DIY Message Boards  Hop To Forum Categories  Home Improvement  Hop To Forums  Remodeling    Exterior sheathing question
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        Exterior sheathing question Sign In/Join 
        posted
        Hi all, I'm planning on hiring out to have new siding put on an extension of my house. I have no idea what I'll find under the existing siding. The original sub roof was particle board. Also, I don't know what condition the sheathing is in or if there is any house wrap on it.
        So, I may have to replace that. I want to make sure proper sheathing is used. Is OSB okay, or should I stick with plywood? Also, I'm thinking minimum thickness should be 3/4"(23/32). If it matters, I live in Chicago. I don't know how different bldg. codes are from city to city.
        Thanks for any replies.
         
        Posts: 30 | Location: Chicago | Registered: Feb 28, 2012Reply With QuoteReport This Post
        posted Hide Post
        OSB is fine for sheathing. Usually it is cheaper than any plywood. Typically it is 7/16" thick. Are you sure the roof was particle board?


        General Disclaimer

        Any advice given here is general in nature and is not necessarily valid for your given area. If in doubt check with your local codes enforcement department for what is required when doing electrical, plumbing or structural work on your house. Permits may or may not be required in your area and home owners may not be able to DIY some tasks. I have no way of knowing if you have the skills needed to complete the tasks you are asking about, when in doubt seek professional assistance.

        My advice may be worth exactly what you pay me for it. :-) For the record I did not stay in a Holiday Inn Express last night.
         
        Posts: 890 | Location: Cary, NC | Registered: Aug 17, 2006Reply With QuoteReport This Post
        posted Hide Post
        Thanks for the reply. Only 7/16"? I would have thought that too thin.
        This part of the roof I'm talking about was on the extension that the original homeowner put on. I had this roof replaced many, many years ago and if I remember correctly, the roofer I hired scoffed at what used for the roof. I remember it as him saying it was particle board.
         
        Posts: 30 | Location: Chicago | Registered: Feb 28, 2012Reply With QuoteReport This Post
        posted Hide Post
        7/16 or 15/32 OSB is pretty common sheathing, just shy of 1/2 inch. It is even used for roofs, but when coupled with roof trusses 24" on center it can develop waves which are really visible with standard 3 tab shingles. Not as bad with architectural shingles or with rafters 16" OC. For wall sheathing I don't see a compelling reason to go with plywood or thicker OSB. You could make the argument on a roof.

        Particle board would be an inappropriate roof sheathing. It is also a lot more expensive than OSB, cheaper than plywood though. But still the wrong thing.


        General Disclaimer

        Any advice given here is general in nature and is not necessarily valid for your given area. If in doubt check with your local codes enforcement department for what is required when doing electrical, plumbing or structural work on your house. Permits may or may not be required in your area and home owners may not be able to DIY some tasks. I have no way of knowing if you have the skills needed to complete the tasks you are asking about, when in doubt seek professional assistance.

        My advice may be worth exactly what you pay me for it. :-) For the record I did not stay in a Holiday Inn Express last night.
         
        Posts: 890 | Location: Cary, NC | Registered: Aug 17, 2006Reply With QuoteReport This Post
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