A roof sump assembly incorporates a primary roof drain and an adjacent overflow drain within a 4-foot by 6-foot area. Drain elevation sits 1 inch below the sump perimeter, with the roof surface sloped at 1 inch per foot toward the drains. Waterproofing consists of 30-inch by 54-inch 4-pound lead flashing and stripping plies. Sump layout dimensions include 6-inch radii for drain and overflow openings, with specified spacing for flashing and plies.
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