GRP Roofing Large Roof Ridge Closure - Cromar - GA/C5

Name: GRP Roofing Large Roof Ridge Closure - Cromar - GA/C5
Brand: Cromar
SKU: izkdx4oife
Availability: InStock

The Cromar GRP Roofing Large Roof Ridge Closure is designed to be used in conjunction with other P...

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Product Information

Full details

The Cromar GRP Roofing Large Roof Ridge Closure is an essential component for professional roofing contractors and skilled DIYers installing a GRP (Glass Reinforced Plastic) flat roofing system. It provides a clean, weather-tight finish at the roof's ridge, effectively sealing the junction where two roof slopes meet or where the roof meets a wall abutment. While it ensures a high-quality, long-lasting seal for ProGRP systems, it requires precise measurement and correct adhesive application to maintain full structural integrity.

All features

Model Part Number	GA/C5
Brand	Cromar

Extended Product Information

FAQs

Is this ridge closure compatible with non-Cromar systems?

It is specifically designed for the ProGRP system. While it may physically fit other systems, compatibility with different resin types is not guaranteed.

What tools do I need to install it?

You will need a hacksaw or grinder for cutting, a drill for mechanical fixing, and a roller for applying the GRP resin over the trim flange.

Do I need to sand the trim before applying resin?

Yes, lightly sand the surface of the GRP trim where the resin will overlap to ensure a strong mechanical bond.

Can this be painted after installation?

The product is designed to be finished with the standard GRP topcoat resin used for the rest of your roofing project.

How do I ensure a watertight seal?

Use a combination of high-quality proprietary sealant underneath and a glass-fiber reinforced resin bandage over the top joint.

Troubleshooting

Trim is not bonding securely to the roof surface

Ensure the surface is completely dry and free from dust or grease; re-clean with acetone if necessary before reapplying sealant.

Visible gaps between trim sections

Apply a high-quality GRP filler or additional resin and glass fiber bandage to bridge the gap and create a seamless transition.

Pros and Cons

Pros

Ensures a watertight finish at high-stress points
Matches perfectly with ProGRP trim components
Highly resistant to weathering and UV degradation
Lightweight yet structurally rigid construction

Cons

Requires professional-grade adhesive for proper bonding
Specific to Cromar ProGRP systems and may not fit generic trims
Requires careful cutting and fitting for aesthetic precision

Setup, Compatibility & Care

Before installation, ensure that the roof edge is clean, dry, and free of debris. Measure the ridge length and cut the closure using a fine-toothed hacksaw or angle grinder if necessary. Apply a generous bead of GRP-compatible sealant along the mounting surface. Place the closure into position and mechanically fix it using the recommended stainless steel fasteners spaced at 300mm intervals. Once fixed, apply the GRP resin and glass reinforcement over the trim flange to seal it into the roofing membrane. For care, perform an annual visual inspection to ensure no mechanical fasteners have backed out and that there are no hairline cracks in the resin coating covering the joint.