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.
A170 drip trim – The smallest size of the dedicated drip trims, the dimensions are : Length 3m – Drop 65mm – Flange > 80mm – Roll 10mm
A200 drip trim – The mid size of the drip trims, the sizes are : Length 3m – Drop 90mm – Flange > 80mm – Roll 10mm
A250 drip trim – the largest of the drip trims, the dimensions are : Length 3m – Drop 140mm – Flange > 80mm – Roll 10mm
AT195 EX – Although not technically a drip trim it lends itself to situations like that of simulating lead bay drips, size as follows : Length 3m – Drop 70mm – Flange > 100mm
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.
B230 raised edge trim – The smallest of the dedicated raised edge trims, the dimensions are : Length 3m – Visible face 105mm – Flange > 100mm – Roll 10mm
B260 raised edge trim – The mid size raised edge trim, the sizes are : Length 3m – Visible face 125mm – Flange > 100mm – Roll 10mm
B300 raised edge trim – The largest of the raised edge trims, the dimensions are : Length 3m – Visible face 175mm – Flange > 100mm – Roll 15mm
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.
Wall trim – Essential to allow expansion and contraction where a roof abuts a wall, can be twinned with dedicated internal and external corners seen below.
D260 Wall fillet – The dimensions are : Length 3m – Height 150mm – Width 120mm. Can also be paired with the C3 corners below, as well as the C2 fillet trim listed further down the page
C3 External and C3 Internal Pre formed corners – These provide greater strength when going around corners and avoid the need to create mitre joints. Made for the D260 wall fillet.
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.
Internal & external angle trim – Very useful when a situation requires them, one slightly acute, the other obtuse.
AT195 INT angle trim – Slight Obtuse angle – Size 70mm by > 100mm
AT195 EX angle trim – Slight Acute angle – Size 70mm by > 100mm
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.
Flat flashings – Again very useful, but be warned these will have been rolled up and may be little curly in length.
F300 flat flashing – Sizes are : Width 300mm and sold by the metre up to 20m Long
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.
Soffit trim – Prone to rattle in exposed areas, may need bottom trim batten as pictured and PU.
S500 Soffit trim – The dimensions are : Length 3m – Visible face 200mm – Flange 90mm – Bottom return 80mm
GRP Corners and Trims
Used to provide a sturdy backbone to roofing trims at corners and returns.
C2 Fillet trim – Available left and right handed and compatible with A200 B260 and D260
Upstand Height 120/140mm
C1 and C4 moulding – Available in both Internal and External profiles for A200 and B260 trims
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.
C100 and C150 simulated lead flashing – Length 3m and Depth 100 and 150mm – Wall ( chase ) penetration 35mm
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 gutter – Ideal for expansion breaks.
G180 Gutter trim / Expansion joint – The dimensions are : Length 3m – Flanges 30mm – Trough depth 15mm – Gutter width 80mm – Overall width 160mm
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.
