Roof drain

A roof drain apparatus comprising:

• a grated,dome-shaped cover, said cover including an outward annular flange having throughbores;
• a roofing material clamp having an upstanding radial flange, an upper surface, a lower surface and a central aperture, said roofing material clamp including throughbores in registration with the throughbores of said cover;
• a generally funnel-shaped tubular drain body having an upper portion and a lower portion, said upper portion having an outward annular flange with threaded bores in registration with the throughbores of said roofing clamp, said lower portion having exterior threads;
• threaded fasteners for demountably fixing said cover and said roofing material clamp to said drain body;
• a generally funnel-shaped tubular sleeve for receiving said drain body, said sleeve having an upper portion and a lower portion, said upper portion having an outward annular flange;
• and
• a nut interengaging said threads of said drain body, said nut abutting said lower portion of said drain body;
• whereby
• upon installation of the roof drain apparatus and tightening said nut, said sleeve is urged against said drain body to exert a clamping force on a roof substrate therebetween, and thereby prevent the formation of bulges and depression in the roof substrate.