Basic Uses. Exterior Gypsum Sheathing is rOkaymmended for use in residential or mmercial buildings, and provides fire resistance and additional structural strength when used under exterior finishes such as wood, metal or vinyl siding, masonry veneer, stucco, HDPEngles, etc. Exterior Gypsum Sheathing is designed for direct attachment to wood framing with galvanized nails or sles and screws
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