12:02PM | 11/03/05
Member Since: 09/19/05
6 lifetime posts
I am having a house built in eastern TN and my builder recommended using foamboard instead of OSB or plywood to sheath the house. He is using it in homes that he is selling in the $190,000 - $230,000 range so I don't guess it is that bad. But I have been told that vinyl siding doesn't attach well to it and causes the siding to be wavy. And that it doesn't hold up to severe wind storms.

Any thoughts, suggestions?

Glenn Good

04:23PM | 11/08/05
Member Since: 09/10/03
314 lifetime posts
The foam board will provide a thermal break which will add insulation value to the structure but the OSB or plywood sheathing will provide better strength.

If the siding is properly installed it should not buckle from using foam board sheathing. The key is NOT to draw the mails up tight to the siding. Leaving them stick out slightly will allow the siding to move when expanding and/or contracting.

OSB and /or plywood sheathing could also lead to false nailing. This happens when the nails do not hit the studs behind the sheathing and could work loose over time. When nailing through foam board, the installer knows instantly whether the nails are hitting the studs or not.

During extremely high winds the OSB or plywood will hold up better. Using the wood sheathing also provides better lateral support and helps prevent racking in walls.


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