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Old 11-18-2011, 01:52 PM   #1
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Foamboard sheathing


I have an external doorframe that I am closing up. I was wondering if I could use foamboard such as DOW SUPER TUFF R as the external sheathing. I do not plan on using osb or plywood in addition to this since the thickness would be more than the current sheathing.

From the studs to the outside: the layers would be stud, dow super tuff, tyvek, and hardboard siding.

from the inside, kraft faced insulation in the cavity and 1/2 inch gypsum.

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Old 11-19-2011, 12:48 AM   #2
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Foamboard sheathing


Sounds good, as there is probably enough shear on each side of the door to pass inspection when initially built. Air seal the drywall: http://www.buildingscience.com/docum...wall-approach/
Tape seal the Tyvek seams, add sill sealer or two rows of caulking under the bottom plate.

Gary

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