A 1/12 roof pitch—meaning the roof rises one inch for every twelve inches of horizontal run—is extremely low and generally considered acceptable only if strict waterproofing protocols and specialized roofing materials are utilized. Standard asphalt shingles cannot be installed on a 1/12 pitch because water will back up under the shingles and cause severe leaks. Instead, low-slope roofing systems such as single-ply membranes, modified bitumen, or standing seam metal must be used to ensure proper watertight performance and prevent standing water accumulation on the building structure.
1 votes
Marked as accepted