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Is it necessary to tape the joints in the base layers of fire-resistance rated multi-layer gypsum board to maintain he fire resistance rating?

April 26, 2017base gypsum joints layers multi-layer necessary rated tape

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Is it necessary to tape the joints in the base layers of fire-resistance rated multi-layer gypsum board to maintain he fire resistance rating?

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No. In multi-layer systems, the joints and fasteners in the base layers are covered and protected by the overlying layers of gypsum board.