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Professional Building Supplies£74.56Visit shop Cromar Grp Roofing Rainwater Outlet For Internal Drain - 110Mm
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The GRP Roofing Rainwater Outlet (110mm) is a precision-engineered drainage solution designed for professional flat roofing contractors and installers seeking a reliable, leak-proof water management system. It provides a seamless transition for internal drainage, ensuring long-term structural integrity by effectively diverting water away from the roof surface. While it offers superior durability when paired with the ProGRP system, users should note that successful installation requires specific attention to detail when integrating the GRP membrane to maintain a watertight seal.
| Model Part Number | GA7116 |
|---|---|
| Brand | Cromar |
No, this outlet is specifically engineered for GRP roofing systems and will not bond properly to EPDM.
It refers to the nominal pipe size compatible with standard 110mm internal drainage pipes.
This product is designed for flat roofing systems to manage water runoff; it is not typically required for steep-slope roofs.
Use a soft brush and water to clear debris from the grate area during regular roof maintenance checks.
Yes, use the standard ProGRP laminating resin and chopped strand matting provided in the ProGRP installation kit.
Ensure the roof deck has a slight fall towards the outlet and that the GRP membrane has been feathered correctly during installation to avoid a raised lip.
Inspect the bond between the GRP laminate and the outlet flange; re-apply resin and additional fiberglass reinforcement if delamination is detected.
Setup: Installation involves preparing the substrate, cutting the aperture to fit the outlet diameter, and applying the ProGRP resin and fiberglass matting over the outlet flange. Ensure the outlet is level with the deck to promote consistent drainage flow.
Compatibility: This product is strictly designed for use with the ProGRP system. Do not attempt to use it with bitumen-based or EPDM systems as the chemical compatibility and bonding procedures differ significantly.
Care: Periodically inspect the drainage area for debris such as leaves or silt. Flush the internal pipework annually to ensure the 110mm opening remains clear of blockages that could cause backup on the roof deck.
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