A poor installation occurs when a circular hole has been cut in the roof that ends up off center of the leader pipe. The result is usually a crooked or off-set leader. The Smith square sump receiver allows the hole to be cut oversize and square permitting the drain to be shifted and centered over the pipe. The illustration shows the probable result of not using a sump receiver. The drain body is improperly seated on the deck, causing roofing felts and other roofing materials to create a dam-like effect around the drain, resulting in a puddle in the vicinity of the drain. This problem can always be eliminated with a sump receiver.
SUFFIX -R SUMP RECEIVER should be specified on all but poured-in-place roof drain installations. The sump receiver is a square metal plate with recessed center opening to accept the drain body flange. This eliminates the puddle of water surrounding many roof drain installations due to the flange resting on top of a circular hole cut in the roof.
SUFFIX -C UNDERDECK CLAMP should be specified on all but poured-in-place installations. Roof drains must be firmly secured to the roof with an underdeck clamp, otherwise, due to snow loads, rain loads and regular expansion and contraction, the drain will work in and out of the roofing, causing roofing membranes to flex and fail. Brittle tar will crack and leaks will occur.
An "L" shaped underdeck clamp Suffix -CL is available for use when the regular underdeck clamp is not acceptable. Specify the "L" shaped underdeck clamp when the deck thickness is less than the minimum dimension shown for the regular underdeck clamp. This is particularly applicable for roof drain installations in metal roof decks.
EXTENSION HEIGHT SHOULD BE SPECIFIED 1/2"
LESS THAN INSULATION THICKNESS
SUFFIX -E FIXED EXTENSION is specified when insulation is used, it is available in any height from 3/4" (minimum). During construction, prior to installation of insulation, the extension can be removed to eliminate water build-up. The extension is sealed by gasketing. Adjustable type extensions are available. (See Fig. 1015).
SUFFIX -C2 SECONDARY FLASHING CLAMP is specified when an extension is required with a flashing clamp at the bottom of the extension to clamp the flashing at that location in lieu of the upper flashing clamp or it may be used to clamp a secondary flashing.
OUTLET TYPE L SPEEDI-SET connection consists of a push on outlet with a factory inserted neoprene gasket. This connection can be used with all piping materials, including service weight, extra heavy, "NO-HUB", steel and plastic. NOTE: Piping material must be specified.
EXPANSION JOINTS
FIG. 1710 SEPARATE EXPANSION JOINT
with internal seal not exposed to the flow drainage passing; however, provisions must be made in installation for access to the outside packing gland adjustment nuts. These units should only be used in a vertical position and with a roof drain.
NOTE: Do not use with speedi-seal and plastic leaders.
DX DRAIN IN WOOD DECK INSTALLATION
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