Dow Structural Insulated Sheathing Sis

05 25 2012 09 39 am i heard last week that dow is ending production of its structural insulated sheathing sis product and got an email today from our rep confirming that rumor. Builders can use inch r 3 panels to sheathe entire exteriors or 1 inch thick r 5 5 panels as shear panels on corners to match up with 1 inch foam sheathing on the rest of the exterior. Air infiltration rate vs.

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