Smith 1310 Underdeck Clamp
An underdeck clamp for the Smith 1310 Roof Drain should be specified on all but pour-in-place roof drain installations.
Roof drains must be firmly secured to the roof with an underdeck clamp. If not, snow and rain loads, and regular roof expansion and contraction will cause the roofing membranes to flex and fail. Brittle tar will crack and leaks may also occur.