OSB vs Foam Board

daviddsims1May 17, 2014

Just discovered this forum and all the great info provided. Will be building a home in a few years and see so many new homes in the area built with foam board on the outside and OSB at the corners. I have only seen one company putting all OSB around the complete house. I am assuming builders are using more foam because it is cheaper but I could be wrong. Anyone know the reason for the switch?

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robin0919

The GC's are doing it for ONE reason only.....to put as MUCH profit in their pockets period!!! They are doing as little as possible to meet MIN building code!

    Bookmark   May 17, 2014 at 10:56PM
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renovator8

To be able to say something meaningful about the use of these two building techniques in your area we would need to know the climate, the size of the house in terms of width and height and the wind and earthquake zones.

The building codes are minimum requirement and apply to most situations but it they are quite adequate and in the more extreme situations a structural engineer is required.

    Bookmark   May 17, 2014 at 11:09PM
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daviddsims1

Zone 3 North Louisiana is my area and most of the homes are around 2300 sq ft heated. It sure seems to be the rule and not the exception.

    Bookmark   May 17, 2014 at 11:35PM
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renovator8

I doubt the use of insulating sheathing alone would be code compliant lateral bracing for a 2 story house in your area. I am surprised that full structural sheathing is not required in a tornado zone. Are most of the houses masonry clad?

    Bookmark   May 18, 2014 at 6:50AM
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daviddsims1

All of these homes are brick. So if osb is used for the outside, do you just then rely on interior for insulation?

    Bookmark   May 18, 2014 at 8:22AM
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ZGAnderson

The rigid foam exterior provides a thermal break (eliminates a continuous non-insulated connection from exterior to interior at the studs) and increases overall insulation. The OSB or Plywood corners provide the structural (racking, resistance against falling over) strength.

I would prefer to build our house with foam sheathing like you describe, but it's uncommon where I live and I'm relying on the experience of my subs to get the job done right. I can't teach my framing crew how to do something based on my 'book' knowledge.

    Bookmark   May 18, 2014 at 3:47PM
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robin0919

The foam board is minimally insulation, you would still need insu. in the wall from inside. If you can, the best practice is to use OSB and then install the foam board on top of that.

    Bookmark   May 18, 2014 at 7:34PM
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