Flat Roof Drain,Dn 70,Incl. Leaf Guard,With Bitumen Flange ... from sc02.alicdn.com I never realized that shrinkage could be such a problem. Most flat roofs are not actually flat: Flat roof drains, scuppers, gutters and drainage systems on flat roofs.
For now, the roof drains properly and has no problems.
To help prevent this you should allow for more than one outlet to drain an area and provide leaf guards to all outlets. This happens because of small debris collecting around the leaf filter. Watts roof drains provide flexible solutions for specifiers and installers in any commercial roof application. Say goodbye to gutter cleaning forever.
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