Roof Trims

Flat Roof Edge Trims for GRP, Felt & Liquid Systems – Drip, Kerb & Perimeter Profiles

Roof trims play a crucial role in flat roof installations, not only improving appearance but also protecting vulnerable roof edges from wind uplift, rain penetration, and damage over time. These help secure membranes or coatings at terminations, reinforce perimeter stability, and provide a tidy finish around corners, upstands, and drip edges. Whether you're installing a GRP, felt, or liquid-applied system, choosing the correct trim profile is key to achieving a watertight, professional result. Compatible with a range of building supplies and accessories.

We stock a wide range of roof trim profiles to compliment our complete roofing kits including edge trims for horizontal terminations, raised kerb trims for upstands, internal and external corners, and drip trims for directing rainwater into gutters. Most profiles are available in various lengths and colours to match your chosen roofing system. The lightweight construction makes them easy to transport and handle on site, and many can be cut to size using basic tools.

Many of our roof trims are supplied with fixings or compatible jointing clips, and most feature pre-formed angles to reduce the need for mitring. They are compatible with common substrates such as OSB, plywood, and concrete, and can be installed using adhesives, mechanical fixings, or a combination of both depending on the roof system and trim material. We also offer internal trims for wall interfaces and gutter outlets for drainage integration.

Whether you're detailing a new flat roof or replacing weathered trims during refurbishment, our roof trims help create a secure, watertight edge while maintaining a clean, finished look. With options for all types of membranes and detailing situations, you’ll find everything you need to complete your flat roofing project with confidence.

Roof Trims FAQs

What type of roof trim do I need for a flat roof edge?

For horizontal roof edges, use a standard edge trim or perimeter trim that secures the membrane and gives a neat finish. If you're directing water into a gutter, choose a drip trim that includes a built-in downward lip to guide water runoff effectively. Raised kerb trims are used at wall interfaces or to create an upstand at the roof edge.

Are roof trims compatible with all waterproofing systems?

Most roof trims are designed to be compatible with specific waterproofing systems like GRP, felt, or liquid membranes. It’s important to select trims recommended for your chosen system to ensure proper adhesion, sealing, and mechanical compatibility. Always check compatibility in the product information before purchasing.

Do I need to seal between trim joints or corners?

Yes, it’s good practice to seal joints using a compatible sealant or adhesive to prevent water ingress at connections. Some trims come with joining clips or pre-formed corners to simplify alignment and create a weathertight seal. Always refer to the system guidance or installation instructions for best results.

Can roof trims be cut to fit on site?

Yes, most trims can be cut to size using standard tools such as a fine-tooth saw, hacksaw, or grinder (depending on the material). Always wear appropriate safety gear and deburr edges where necessary to avoid sharp finishes. Take care to maintain square cuts for a neat and effective join.

Do I need special fixings for installing roof trims?

Not necessarily. Many trims can be installed using standard fixings such as nails or screws, though some systems may include specialist fasteners or adhesives for additional hold. Fixing guidance depends on the roof deck type, the membrane being used, and the trim material, so it’s always best to follow manufacturer instructions.