the permanent roof
Home. Up. Trade Info. Fascias. Flashings. Gutter Systems. Thermal. Eco roof. Railing Pads. Joinery. Balconyprep. Rooflights. Mansard. Permadeck DL. Edge trims. Compare. Zero Carbon.

Don’t get lost! These are tech pages only, go to HOME for main page list

Have you watched the Permadeck videos?


Permadeck with  soft single ply systems

E&OE      The text and graphics of this website are Copyright © 1996-2015 all rights reserved by Seamless Roofing Ltd.  Permadeck, Thermadeck & Flexiroof are registered trade marks.  The contents of this website are subject to review and are a guide only and do not represent a binding offer. The BBA logo is Copyright © British Board of Agrément.  

If you found this page informative please tell others by clicking the +1

Rainwater Outlets
In the 70s, in particular, it was the fashion to hide the fact that there was a slope on the roof.  Architects designed little parapets to do this but then couldn't have a gutter!  So internal gutters (troughs) were born with internal rainwater outlets going through the roof.  Not a good idea.  Especially when used with roofing felt because the felt is so thick it reduces the bore considerably.  Wherever possible Seamless Roofing install hopper heads and cut a small notch in the parapet to let the water off the roof.  This means that if leaves or dirt clog the outlet it's the hopper that chokes and floods and NOT the roof.  The hopper can be readily cleaned out.  Easy peasy with Permadeck.
Before: Roof with internal outlet causing flooding, worry & constant maintenance.
After: Roof can NEVER flood again.  Only the hopper needs occasionally checked for leaves.