Because the retrofit roof drain will sit directly inside the pipe roofers.
Retrofit roof drain installation.
If the drain was messed up by other roofers then the second best thing to do is to install a retrofit.
Application tri built aluminum retrofit roof drains are designed to replace existing drains in re roofing applications.
It is crucial to have a proper drain for a flat roof.
Installing your retrofit roof drain remove the broken drain from the drain pipe.
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Pvc new installation roof drains installation step 1.
Insert the retrofit.
Omg supplies roofing fasteners for the roofing industry as well as pipe supports insulation adhesives retrofit roof drains and construction accessories.
Installed from the roof surface these drains are engineered to be installed without removing the existing plumbing or fixture while providing a watertight connection to the roof system and the existing plumbing.
Flashing attachment install single ply membrane soft copper lead or bur felt flashing between clamping ring and drain flange.
The unit is based on a flat underside flange for flush roofing material installation.