Flat Roof Vapour Barrier
Used for vapour control layers and self-adhesive vapour barrier build-ups under flat roofs.
Trims, Resins, Tools & Roof Supplies For GRP Flat Roofs
GRP Roof Trims, Resins & Accessories
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…
What does your kit not include?
Kits cover the laminate. Order trims, outlets, primer, tools and deck boards separately for a complete roof.
OSB Roof Deck
Used as the deck base before installing suitable GRP roofing systems.
Roofroll Lead Alternative
Used for GRP roof accessories, preparation items, tools or finishing details in this section.
Prymax GRP Primers/Sealers
Used for primers and sealers before compatible roof coatings, repairs or GRP preparation.
Flat Roofing Tools
Used for rollers, brushes, buckets, applicators and tools needed for GRP and liquid roofing work.
GRP Trims
Used for GRP roof edges, corners, drips, upstands and perimeter finishing details.
Acetone solvents
Used for GRP tool cleaning, resin preparation and solvent clean-up where suitable.
Fibreglass Matting
Used for chopped strand mat, woven tape and reinforcement layers in GRP roofing systems.
G4 sealer
Used where a compatible G4 sealer is required.
GRP Roofing Outlets
Used for rainwater outlets, drain outlets and pipe details on flat roof systems.
Roofing Resins & Topcoats
Used for GRP resin, topcoat, catalyst and fibreglass roofing liquids.
Showing 1–16 of 104 resultsSorted by price: low to high
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Bucket 3 Litre
£1.66 ex VAT£1.99 inc VAT£0.55 / LAdd to cart -
Bucket 5.6 litre
£1.66 ex VAT£1.99 inc VAT£0.30 / LAdd to cart -
Clear Graduated Mixing Cup
£1.66 ex VAT£1.99 inc VAT£5.53 / 100 mlAdd to cart -
Push Fit Roller Arm
£1.66 ex VAT£1.99 inc VAT£0.28 / mAdd to cart -
Economy Fluffy Frame 75mm
£1.66 ex VAT£1.99 inc VATAdd to cart -
Roller Economy Fluffy Refill 75mm
£1.66 ex VAT£1.99 inc VATAdd to cart -
Laminating Brush 50mm
£1.66 ex VAT£1.99 inc VATAdd to cart -
Sale!
Catalyst 100g
Original price was: £2.49.£2.48Current price is: £2.48. ex VAT£2.98 inc VAT£2.48 / kgAdd to cart -
Roller Fluffy Refill 150mm
£2.49 ex VAT£2.99 inc VATAdd to cart -
Roller Topcoat Refill 150mm
£2.49 ex VAT£2.99 inc VATAdd to cart -
Laminating Brush 75mm
£2.49 ex VAT£2.99 inc VATAdd to cart -
Buckets 11 litre
£3.33 ex VAT£3.99 inc VAT£0.30 / LAdd to cart -
Laminating Brush 100mm
£3.33 ex VAT£3.99 inc VATAdd to cart -
Sale!
300g Chopped Strand Mat Roll for GRP Roofing
Price range: £4.15 through £100.83Select options This product has multiple variants. The options may be chosen on the product page -
Sale!
Chopped strand – 300g 1kg
Price range: £4.15 through £100.83Select options This product has multiple variants. The options may be chosen on the product page -
Telescopic Extension Handle
£4.16 ex VAT£4.99 inc VATAdd to cart
Quick category guideQuick guide to GRP Roof Trims, Resins & Accessories
This category is for preparing, installing, finishing or maintaining a GRP fibreglass flat roof system. Use it to check the product type, surface compatibility, preparation work and related CRS options before ordering.
Choosing guide
Need help choosing?
Use these quick checks to make sure this category suits the job before ordering.
What is this category for?
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.
Not the right choice if
- 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.
Also useful for
- GRP Roof Trims, Resins & Accessories
- GRP roofing accessories
- GRP installation accessories
- GRP roof trims
- fibreglass roof supplies
- roofing tools
Related pages
11 catsAccessories
A–B–FTrim series
4.6★1,300+ reviews
UKStock
What does your kit not include?
Kits cover the laminate. Order trims, outlets, primer, tools and deck boards separately for a complete roof.
What Do I Need Beyond The GRP Kit?
A GRP roofing kit covers the laminate — resin, fibreglass matting, catalyst and topcoat. Most installations also need edge trims to form the drip or raised edge, a drain outlet or through-wall outlet, application tools, acetone for clean-up, and primer where the deck or surface needs preparation. New build roofs also need OSB3 deck boards and may need a vapour barrier below the deck. Accessories are sold separately here so you can add exactly what the project needs without paying for duplicates.
GRP Edge Trims
A-series drip edge trims, B-series raised edge trims, corner trims, flat under-tile trims and trim adhesive.
Resins & Topcoats
Roofing resin, topcoat, catalyst and hardener — bought separately for top-ups, repairs and custom builds.
Fibreglass Matting
300g, 450g and 600g chopped strand mat rolls and woven reinforcement tape for joints and perimeters.
Flat Roofing Tools
Rollers, bubble buster rollers, brushes, buckets, mixing cups and tool packs for resin and topcoat application.
Roofing Outlets
Soil pipe outlets, rainwater vertical drain outlets, through-wall parapet outlet trims and flat roof drain outlets.
OSB Deck & Vapour Barrier
OSB3 T&G deck boards and Elotene DSN self-adhesive vapour control layers for new flat roof build-ups.
Why CRS
A170, A200, A250 drip trims and B240, B260, B300 raised edge trims stocked
GRP corner trims, F300 under-tile flat trims and Soudal trim adhesive
300g, 450g, 600g chopped strand mat rolls — buy by roll or cut length
4 outlet types: soil pipe, rainwater, through-wall parapet and flat drain
Prymax GRP Primer in 1kg and 5kg
Elotene DSN self-adhesive vapour barrier in 10m, 20m, 30m and 40m rolls
Not right if
Existing roof needing repair or overlay — not a new deck
Rotten or structurally failed deck — replace deck first
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.
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.