Overflow Drain - Water Dam Type with Adjustable Extension
Overflow Drain - Water Dam Type with Adjustable ExtensionOverflow Drain - Water Dam Type with Adjustable Extension

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Overflow Drain - Water Dam Type with Adjustable Extension

Figure Number:  1045
Product Function:
Used in flat roofs of any construction where a constant height of water is desired on the roof. It may also be used as an emergency overflow for conventional roofs, draining down rain water when the depth of the water on the roof reaches the water dam height.

Regularly Furnished:
Duco Cast Iron Body with Adjustable Extension Sleeve, Reversible Collar, Combined Flashing Clamp and Water Dam and Polyethylene Dome.
Product Details
  • Product Type:  Roof Drain
Related Figure Numbers
  • 1045-E - With Specified Height Extension
  • 1045-WF - With Wide Flange Body
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NameDescriptionFile Size
Specifications US Govt ComplianceItems complying with U.S. government specifications34 KBDownload
CSI Specifications for Roof DrainsCSI Specifications for Roof Drains230 KB
NameDescriptionFile Size
Parts Order Guide for Roof DrainsParts Order Guide for Roof Drains632 KBView

Optional Materials

  • Aluminum Dome -AD
  • Cast Iron Dome -CID
  • Galvanized Cast Iron -G - Body & Collar
  • Galvanized Cast Iron Dome -CIDG
  • Rough Bronze Dome -RBD


  • 2 1/2(64), 3(75), 4"(100) Water Dams Available -WD
  • Expansion Joint (Specify Fig. 1710)
  • L-Shaped Underdeck Clamp -CL
  • L Speedi-Set® Service Weight - 02(50), 03(75), 04"(100) Sizes Only
  • LXH Speedi-Set® Extra Heavy.
  • Removable Water Dam
  • Secondary Flashing Clamp -C2
  • Sump Receiver -R
  • Underdeck Clamp -C
  • T Threaded Outlet