Flat Roof Repair with Cromar Hydrosil

In this project, the client came to us after their existing GRP (Glass Reinforced Plastic) flat roof developed multiple “stipple” holes — small perforations where water ingress was occurring. The damage threatened the integrity of the roof surface. Our mission was to restore the waterproofing, reinforce durability, and extend the life of the roof without a full replacement.

Challenges & Objectives

• The GRP roof surface had developed stipple holes, weakening the membrane and allowing potential leaks.
• The client wanted a cost‑effective repair rather than a full roof replacement, if viable.
• We needed to prepare the surface properly so the repair treatment would adhere and perform long term.
• The repair had to seamlessly blend into the existing roof and maintain a watertight seal under all weather conditions.

Our Approach & Execution

1. Surface Preparation
   We began by sanding back the existing GRP surface to remove any loose, failing, or deteriorated material. An acetone cleaning followed to remove dust, dirt, oils, or residues, ensuring a clean and receptive substrate.
2. Application of Cromar Hydrosil
   After achieving a clean, solid base, we applied a fresh, healthy coat of Cromar Hydrosil over the prepared surface. This high‑performance treatment is designed to restore waterproofing and provide a durable, sealing layer for flat roofs.
3. Seamless Integration & Detailing
   Careful attention was given to overlapping, edges, and transitions. We made sure the Hydrosil coat extended correctly over vulnerable zones and joined back into existing membranes cleanly. All weak points were reinforced, so the new layer acts as a continuous barrier.
4. Inspection & Quality Assurance
   At project completion, we inspected the roof thoroughly to check for full coverage, uniformity, and adhesion. We tested for potential leaks, paying close attention to patched or previously damaged zones to confirm performance.

Outcomes & Benefits

• The repair restored the roof’s integrity without the need for full replacement, saving the client time and cost.
• The Cromar Hydrosil coating forged a renewed waterproof seal, guarding against further ingress and protecting the substrate beneath.
• Because we sensitively prepared and detailed the surface, the repair blends in and offers long-term reliability.
• The client regained confidence in their roof’s performance with a durable, effective solution.

Contact Master Roofing UK:

If you’re considering a roof replacement or repair project for your property in Epsom or the surrounding areas, don’t hesitate to contact Master Roofing UK. Our team of experienced professionals is ready to assist you with all your roofing needs, providing reliable solutions and unparalleled customer service. Reach out to us today to schedule a consultation and take the first step toward a safer, more beautiful home.