GRP Roofing Internal Fillet Corner - Cromar - GA/C3INT

Name: GRP Roofing Internal Fillet Corner - Cromar - GA/C3INT
Brand: Cromar
SKU: jljutgvknc
Availability: InStock

The Cromar GRP Internal Fillet Corner is a professional-grade roofing component designed for use w...

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Product Information

Full details

The Cromar GRP Internal Fillet Corner is designed for professional roofers and DIY enthusiasts working with ProGRP flat roofing systems, providing a robust solution for sealing and reinforcing internal corner junctions. Its primary benefit is the creation of a seamless, watertight transition that maintains the structural integrity of the roof line, though users should note it is specifically engineered for compatibility with the ProGRP range and may require precise cutting for non-standard roof geometries.

All features

Model Part Number	GA/C3INT
Brand	Cromar

Extended Product Information

FAQs

Is this corner compatible with non-Cromar roofing systems?

The GA/C3INT is designed specifically for the ProGRP system. Use with other systems may result in poor fitment and compromised waterproofing.

Can I paint this component?

GRP is typically finished with a topcoat. If you need to color-match, ensure you use a GRP-compatible topcoat paint.

What is the material made of?

It is made from high-strength Glass Reinforced Plastic (GRP), also known as fiberglass.

Does it come in different sizes?

The GA/C3INT is a standard component designed for typical internal roof angles in the ProGRP range.

How do I ensure a watertight seal at the edges?

Use a high-quality flashing tape and the designated ProGRP resin system to overlap and seal the edges of the corner to the roof deck.

Troubleshooting

Corner piece does not sit flush against the upstand.

Check the corner angle of the timber frame; if it is not a true 90 degrees, minor trimming of the GRP component may be required.

Gaps appearing between the corner and the deck.

Ensure that the substrate is level and use additional adhesive to fill voids before securing the component firmly in place.

Pros and Cons

Pros

High-grade, durable GRP material
Seamless integration with ProGRP systems
Ensures watertight integrity at vulnerable corners
Professional-grade aesthetics
Easy to install with standard roofing adhesives

Cons

Limited to use with ProGRP product lines
Requires precise measurement for accurate fit
Not intended for non-GRP roofing substrates

Setup, Compatibility & Care

Before installation, ensure the roof deck is dry, clean, and free of dust or debris. The internal corner should be dry-fitted to confirm the angle aligns perfectly with the corner junction. Once aligned, use an approved structural adhesive to fix the fillet corner to the deck and upstand. Always overlap the adjacent trims according to the ProGRP installation manual to maintain a watertight seal. For long-term care, periodic inspection of the roof membrane is recommended to ensure the seal remains intact. Clean the area with mild detergent and water if grime accumulates, avoiding harsh solvents that may affect the GRP surface finish.