ProGRP External Corner - 3mtr

The ProGRP external corner is an external angle trim, pre-formed and designed for multiple uses su...

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Professional Building SuppliesCromar External Corner - 3Mtr
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PVC Cladding UKCromar External Corner - 3Mtr
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Product Information

Full details

The ProGRP External Corner (3mtr) is designed for professional roofing contractors and DIY enthusiasts who require a high-quality, pre-formed finishing solution for flat roofing projects. Its primary benefit is the ability to provide a seamless, weather-tight finish on external angles, copings, and upstands, significantly reducing installation time compared to site-fabricated alternatives. A key caveat to consider is that the material is rigid and requires careful measurement and cutting to ensure a precise, clean fit during the roof edge detailing phase.

All features

SeriesProGRP
Model Part NumberEXT/195
BrandCromar

Extended Product Information

FAQs

Can I paint the ProGRP External Corner?

Yes, it can be painted with high-quality exterior-grade masonry or specialized GRP coatings, but it is typically supplied in a finished state.

What is the best way to cut this material?

Use a fine-tooth hacksaw for manual cutting or an angle grinder with a cutting disc for faster, cleaner cuts.

Do I need special resin to join these pieces?

Yes, you should use standard polyester roofing resin along with glass fiber reinforcement tape (bandage) to ensure a chemically bonded, waterproof seam.

Is this trim suitable for commercial buildings?

Yes, the ProGRP system is robust enough for both residential and commercial flat roofing applications.

How do I handle the 3-meter length safely?

Due to the length and rigidity, it is recommended to have two people carry the trim to avoid bowing and potential snapping.

Troubleshooting

Trim feels loose or vibrates in high winds

Check that fixings are spaced no more than 300mm apart and that the trim is properly bedded into the adhesive layer.

Cracking at the corner joint

Ensure that the GRP bandage has been fully saturated with resin and that there were no air bubbles trapped during the lamination process.

Difficulty achieving a flush fit

Check the timber substrate for levelness; if the substrate is uneven, use a plane or packing shims to create a flat surface for the trim to sit on.

Pros and Cons

Pros

  • Reduces labor time through pre-formed shaping
  • High resistance to weathering and corrosion
  • Provides a clean, uniform professional appearance
  • Compatible with standard GRP roofing resin and bandage systems

Cons

  • Material is rigid and requires precise cutting
  • Requires professional-grade adhesive and sealants for best results
  • Long 3-meter sections require careful handling to prevent cracking during transport

Setup, Compatibility & Care

To install, ensure the timber decking substrate is clean, dry, and free of debris. Measure your roof perimeter accurately and cut the GRP trim using a fine-tooth hacksaw or angle grinder with a diamond blade for a smooth edge. Fix the trims using stainless steel nails or screws spaced at 300mm intervals. Always ensure the trim overlaps the roof deck by the recommended distance to maintain a proper drip line. For care, inspect the roof perimeter annually for signs of damage; if the surface coating becomes worn or chipped, lightly sand the area and apply a fresh topcoat of GRP resin to maintain weatherproofing.

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