This assembly consists of a multi-ply built-up roof system installed over Structural I wood sheathing. The base layer comprises a fiberglass base sheet mechanically fastened to the deck in accordance with Factory Mutual 90 requirements. Two plies of fiberglass ply sheet are adhered above with continuous asphalt moppings, topped with a mineral surfaced fiberglass cap sheet. A staple and tape fastener system secures the layers with specific attachment patterns for the field, perimeter, and corners.
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