NBS Source
List your products

Preformed shape for use with downpipes drainage holes on flat roofs. Manufactured with smooth flange. Flexible, tough EPDM shape is inserted into drainage hole and bonded and / or mechanically fixed to the waterproofing membrane in a sandwich application.

Outlet shape is placed onto the rubber waterproofing and bonded using adhesive and / or mechanical fixings. A patch of waterproofing is installed above the outlet flange and fully bonded completely over the top to ensure area is watertight.

Drainage outlet is protected by having additional layer and fully sealed. A round leaf guard should be inserted into top of hole once installed. Always prime both the outlet shape and the waterproofing membrane before installation.

General information



Waterproof seal


Ethylene propylene diene monomer rubber


240 x 235 x 26 x 24 x 31 mm

Uniclass 2015
Gravity rainwater outlets (Pr_65_50_35_37)Primary
Digital objects
PlatformCompatibleVersionCertified to
Revit 2017 1 2.1
- 1 2.1
Download now from NBS National BIM Library
Similar products from Wallbarn Ltd