Floors must pitch to drains. Check proper drain to use with water-proofed floors. Make certain by specification that membranes are securely attached to drain body by a bolted flashing ring and not lapped to edge of flange, which would nullify security of the membrane. Where there is danger of backwater, drains must be protected. Check heavy traffic areas to avoid future grate failures.
Architectural considerations enter into the selection of floor drains.
Ductile iron tops without Nickel Bronze veneer in finished floors of tile or terrazzo detract from the architectural design. Single drains are not practical where the flow of water across a wide area must be intercepted and diverted. Trench drains should be considered. Trenches should be designed at minimum width to preserve loading capabilities of grates. Integral trench drains consist of an outlet section with one or more extensions bolted to it, and are available with waterproofing flanges.