What is code 5/8 drywall 5 plex?
CGC 5/8 inch SHEETROCK Firecode Core (Type X) Drywall Gypsum Panel, 4 ft. x 8 ft.
A typical 2 storey townhouse requires a 1 hour fire resistance rating to separate it from adjacent suites.
Typically a single sheet of 5/8" drywall for wood framed walls; nothing required in the basement if there is a typical 8" concrete wall. In the attic the 5/8" drywall should protect the trusses (including the truss extension into the soffits) with all joints taped.
Drawings should indicate ratings and locations of fire separations.
You can always check with your municipality to verify.
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