Fibreglass GRP Roof Trims
This section hopefully contains all the essential information for you to plan the layout and appearance of any upstands, drips and kerb edge trims needed. Always visualise the finished job in your mind first.
For any sort of cutting and sanding consider a decent pair of Gilbow tin snips, a good sander and a multi tool to make life easy, and you can find these on the dedicated Roofing tools page. All fibreglassing materials including trims, resins and specialty GRP tools and can be found in our fibreglass roofing supplies link at the bottom of the page.
GRP Roofing Trims
Essential for a professional neat finish to any roof, although the trims are nearly identical from supplier to supplier, quality does vary a little even for exactly the same trim. You may find this factor alone sway’s you toward buying from a particular fibreglass supplier. It does me.
When giving sizes or dimensions of GRP trims below, the top mating surface of a trim that’s either nailed or glued with PU adhesive to the decking, will be referred to as the flange.
Fibreglass GRP Drip trims
Used to direct water from the flat roof at the lowest point into guttering or an outlet, also used around bay window roofs as a drip in some circumstances.
Drip trims – Three common sizes of dedicated drip trims with a attractive roll on the bottom edge. The trim batten is used to support the face of the trim and P.U. can be added for additional strength or to stop trim rattle in windy locations.
Fibreglass GRP Raised Edge Trims
The raised edges are used to keep water on the roof and direct it towards the lowest point, normally an outlet or drip.
Raised edge trims – Three common sizes of dedicated upstand or curb trims with a attractive roll on the bottom edge. The trim batten is used to support the face of the trim and P.U. can be added for additional strength or to stop trim rattle in windy locations, especially with the larger trims.
GRP Wall Fillets and Up Stands
Wall fillets or upstands are a way of creating a waterproof return to an abutting wall, walls or fascia. The D260 is a dedicated example of this and is normally used to hide the recommended 25mm gap left between the roof deck and brickwork.
AT195 INT – The AT195 internal trim is also very good at creating an upstand against walls for very small roofs with little expansion, as it has a very slight obtuse angle and can easily hide an 10mm gap.
Internal and External GRP Roof Trims
The AT195 Internal and External fibreglass trims can be very useful for many roofing jobs like, drip trims, upstands, lining internal box gutters, providing small expansion gaps and returns for abutting walls. The AT195 Int and Ext can vary in quality from different suppliers.
GRP Flat flashings
Many uses such as slipping underneath slates or tiles where stripping may not be easy, sliding underneath air conditioning units without removal, gutter lining or continuous flashings under the junction between pitched roof and flat roof etc.
F600 flat flashing – Size : Width 600mm sold by the metre up to 20m
GRP fibreglass Soffit Trims Edge Trim
Used for capping or encapsulating situations like the edge of a flat concrete roof for example.
GRP Corners and Trims
Used to provide a sturdy backbone to roofing trims at corners and returns.
Upstand Height 120/140mm
GRP Simulated Lead Flashings
Fibreglass flashings are a fast and cheap alternative to lead, bonded into place with PU adhesive with 150mm (6″) overlaps.
GRP flashings – Cheaper than lead but will not form or bend around non square brickwork, which can be problematic. If this could be a potential problem for you, consider installing traditional lead flashing instead.
GRP Gutter Trim and Expansion Joint
Used to form a gutter or trough, sometimes in a roof or used as an expansion joint in a roof that is in excess of 50m2. The E280 raised ridge roll can also be used for expansion if needed.
GRP fibreglass Mopstick Roll and Raised Edge Roll
The E280 and raised ridge roll and E35/40 simulated roll are used to give the appearance of a lead mop stick and to provide expansion points. 3 meter lengths.
GRP fibreglass Rolled Rib Closures
The C5 and C6 rolled rib roof closures, used to close the ends of the E280 and E35/40 trims and give the dressed lead appearance of a mopstick.
- How to Fibreglass a Roof – The starting point for fibreglassing a flat roof
- How to Mix Resin and Topcoat – Catalysts, resins and top coat
- How to Lay the Fibreglass Laminate – Laying techniques small and large
- Fibreglass Roofing Supplies – Buy GRP roof supplies Trade or DIY
- Fibreglass Problems and FAQ’s – Questions and answers
- How to Fibreglass a Bay Roof – A nice starter project
- Roofing tools – Some of the tools I use day to day