Abstract: An inexpensive drain assembly for draining water from flat roofs, balconies, decks and other flat or low sloping surfaces that are covered with a water-tight single layer synthetic roofing and waterproofing membrane. The drain assembly includes a grate having a strainer and a connecting collar, a flanged boot that is contoured to fit snugly around the collar of the grate and is sealed via the flange to the synthetic membrane, and a pipe connector that connects the grate and contoured boot to a standard drain pipe. The flanged boot is made from elastomer that is identical to or compatible with and sealably attachable to the synthetic membrane. The elastomer and the synthetic membrane are made of materials selected from a group consisting of synthetic rubber, rubber-like materials, plastic, and plastic-like materials.