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GRP Roof Trims, Resins & Accessories

OSB Roof DeckShop category
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Shop 18mm tongue-and-grooved OSB3 structural deck boards for GRP flat roof installations. Available as 2400mm x 600mm boards, sold by the pallet.…

GRP Roof TrimsShop category
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Shop grp roof trims for finishing GRP roof edges, corners, wall details, drainage points or perimeter details. This page helps you choose…

Roofroll Lead AlternativeShop category
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Shop roofroll lead alternative for forming flexible lead alternative flashing and weathering details without using traditional lead. This page helps you choose…

Flat Roofing ToolsShop category
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Shop flat roofing tools for GRP and liquid roofing work including resin rollers, topcoat fluffy rollers, bubble-buster paddle rollers, laminating brushes in…

GRP TrimsShop category
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Shop GRP roof edge trims including A170, A200 and A250 drip edge trims, B240, B260 and B300 raised edge trims, F300 flat…

Acetone solventsShop category
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Shop acetone solvent for cleaning GRP roofing tools, rollers and brushes during and after resin and topcoat work, and for degreasing suitable…

Fibreglass MattingShop category
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Shop fibreglass chopped strand mat in 300g, 450g and 600g weights for GRP flat roof lamination, plus woven fibreglass reinforcement tape for…

G4 sealerShop category
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Shop damp seal paint in 1kg, 5kg and 20kg quantities for sealing damp or moisture-affected concrete, masonry and other substrates before further…

GRP Roofing OutletsShop category
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Shop GRP flat roof outlets including the 80mm water soil pipe outlet, 70mm rainwater vertical drain outlet, GRP through-wall parapet outlet trim,…

Roofing Resins & TopcoatsShop category
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Shop GRP roofing resin, fibreglass roof topcoat and catalyst hardener separately for top-ups, repairs, custom material lists and component replacements. Resin wets…

Showing 1–16 of 104 resultsSorted by price: low to high

About GRP Roof Trims, Resins & Accessories & buying advice

Shop GRP roofing accessories for flat roof installations, repairs and finishing — edge trims, resins, topcoat, fibreglass matting, outlets, tools, primers, vapour barriers and OSB deck boards. Everything needed alongside a GRP kit, sold separately so you only order what the job needs.

Buying guide

Choose GRP Roof Trims, Resins & Accessories for preparing, installing, finishing or maintaining a GRP fibreglass flat roof system.

Good choice when

  • Use this category for preparing, installing, finishing or maintaining a GRP fibreglass flat roof system.
  • Use it when the surface is GRP roofing systems and prepared flat roof details.
  • Use it when the measurements, preparation work and related accessories have been checked.

Consider another route when

  • Do not use this category when you need the main waterproofing system or a complete GRP kit rather than an accessory or component.
  • Do not use it when the roof is unsafe or unsuitable without preparation.
  • Do not use it as a shortcut if another CRS system is a better fit.

Next step: Match the accessory to the roof detail, kit type and installation stage before ordering.

What A GRP Kit Does Not Include

GRP roofing kits are built around the laminate system — resin, fibreglass matting, catalyst and topcoat. They do not include edge trims, roofing outlets, application tools, acetone, primer or deck boards. On a new build roof you also need OSB3 T&G deck boards before the GRP goes down, and on an insulated build a vapour control layer below the deck. These are all separate purchases matched to the specific roof layout and edge detail.

Choosing Trims Before You Laminate

GRP trims are fitted and bonded to the deck before laminating, then glassed over as the laminate is applied. This means choosing the correct trim profile is a pre-lamination decision — if the wrong trim is ordered or it arrives late, the lamination cannot proceed correctly. Order trims at the same time as the kit, not after.

Frequently asked questions

What accessories are needed for a GRP flat roof that are not in the kit?

Most GRP kits do not include edge trims, roofing outlets, application tools, acetone, primer or deck boards. Each of these needs to be selected separately based on the roof layout, edge type and drainage design.

Do I need to order trims before I start laminating?

Yes. GRP trims are fitted and bonded to the deck before the laminate is applied. If trims are not on site before lamination starts, the job cannot proceed correctly at the edges.

Can I buy just resin or just matting without a full kit?

Yes. Roofing resin, topcoat, catalyst, chopped strand mat and fibreglass matting tape are all sold separately here for top-ups, repairs and custom material lists.

What outlet does a flat roof need?

It depends on how the roof drains. A roof draining into a downpipe through a parapet needs a through-wall outlet. A roof draining to a vertical drop needs a rainwater drain outlet or soil pipe outlet depending on pipe diameter. A flat roof draining to a gutter at the eaves edge usually does not need a GRP outlet.

Is OSB3 the right decking for GRP roofing?

GRP roofing systems require a structural tongue-and-grooved OSB3 board — specifically 18mm T&G OSB3. Standard flooring-grade OSB is not the same and is not suitable. The T&G joint prevents the laminate cracking at board joints from differential movement.

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