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Material: | GRP |
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The Easy To Use Edge Trim
Typical Cold Roof
1. B260 edge trim. | 2. D260 edge trim |
3. C100 edge trim | 4. A200 edge trim |
5. C1 universal external corner | 6. 18mm OSB3 decking |
7. 450g/m2 Chopped Strand Mat | 8. GRP laminate( roofing resin reinforced by CSM) |
9. Topcoat |
Warm Roof Application
A GRP roof can be easily configured in either a warm or cold roof specification. For a warm roof, a sub-deck is first fixed to the joists at 300mm centres. A vapour check and insulation sheet is then laid over the top. Insulation sheets can also be purchased with a vapour check adhered to one side. The decking should then be fixed on top as it normally would be, screws should be used to fix the boards to the joists and these should penetrate through the insulation and into the joists to the same depth as standard fixings. It is imperative that all layers of the roof are pressed firmly together and that there are no gaps between any of the layers. The GRP should then be laminated over the top of the roof as normal. These roofs will usually require larger edge trim sizes such as A250 and B300.
Cross-Section of Warm Roof onto Decking
A170/A200/A250- Drip Trim
The A type trim is a drip trim, fitted to the lowest edge of the roof usually where the rainwater flows into the gutter. Two support battens should be fixed to the perimeter of the roof to provide space for the gutter to fit behind the trim, with the outer batten attached 10mm lower than the inner batten to allow the trim to sit flush with the roof. Apply PU adhesive to the batten in 30mm beads at 300mm centres, rub the trim into place and nail to the decking. Do not nail through the front of the trim. If the pitch of the roof is only minimal, rainwater is likely to hold behind the trim. A planning machine can be used to take 2mm off the deck to allow the trim to lay flush with the board.
TRIM DETAILS: A170: This is designed for applications where it is not possible to use the larger A200. A200: This is the standard size drip trim. A250: This drip trim is ideally suited for use on warm roofs.
Q&A for GRP Roof Trim Installation: Learn More about GRP Roof trims
Q1: How do I fit GRP trims during a fibreglass roofing installation?
A: Fitting fibreglass trims is a crucial step in completing a roofing project. Start by cutting the trims to size and use a suitable polyurethane adhesive (PU) for a strong bond. Carefully glue and secure the trims to prevent leaks and gaps.
Q2: What's the quick guide for fitting GRP trims?
A: Apply PU adhesive to the perimeter batten, ensuring a 30mm bead at 300mm intervals. Secure trims with nails or staples, maintaining a consistent 30mm PU bead. Join trims by nailing or stapling, starting at each end and progressing at 200mm intervals.
Q3: How do I install A170/A200/A250 Drip Trims?
A: Apply PU adhesive to the batten, allowing space for the gutter. Nail the trim to the decking without nailing through the front. A planning machine can be used to ensure a flush fit on minimal-pitch roofs.
Q4: What's the process for B230/B260/B300 Raised Edge Trims?
A: Fix a single batten level with the deck, apply 30mm PU beads every 300mm, and secure the trim with nails. Reinforce the trim for ladder use, either by doubling up or adding an extra layer of GRP laminate.
Q5: How to fit C100 Simulated Lead Flashing?
A: Fit into a bed joint or a deep chase cut, apply PU adhesive every 300mm, press the trim firmly back to overlap with D trim, and seal with clear silicone. C100 features a 100mm vertical face and 35mm wall penetration.