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312.9 Steel Nail Plates
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Plastic and copper or copper alloy piping penetrating framing members to within 1 inch (25.4 mm) of the exposed framing shall be protected by steel nail plates not less than No. 18 gauge (0.0478 inches) (1.2 mm) in thickness. The steel nail plate shall extend along the framing member not less than 11/2 inches (38 mm) beyond the outside diameter of the pipe or tubing.
Exception: See Section 1210.3.3.