Commercial Roof Coating FAQ

Expert Answers About Commercial Roof Coatings, Systems & Roof Refurbishment

This page answers the most common questions about commercial roof coating systems, corrosion treatment, waterproofing solutions and roof refurbishment.
All answers are concise, technical, and structured to maximise the chance of winning Google featured snippets.

What is a commercial roof coating?

A commercial roof coating is a liquid-applied system designed to waterproof, protect and extend the life of industrial roofs. It seals joints, laps and fixings, prevents corrosion, stops leaks and adds 10–20+ years of service life without removing the existing roof.

What is cut edge corrosion?

Cut edge corrosion is the deterioration that occurs at the cut edges and laps of metal roof sheets where the factory coating breaks down. Moisture enters exposed steel, causing rust, lifting coatings and eventual leaks. Specialist treatments seal edges, stop corrosion and restore roof integrity.

What is asbestos roof encapsulation?

Asbestos roof encapsulation is the process of sealing asbestos-cement sheets with a specialist coating to prevent fibre release, water ingress and surface deterioration. It stabilises the substrate, improves weather resistance and extends roof life without disturbing or removing the asbestos material.

How long do commercial roof coatings last?

Commercial roof coatings typically last 10–25 years depending on the system, roof condition and exposure levels. High-quality coatings such as silicone, polyurethane and hybrid polymer systems offer long-term protection and can significantly delay or avoid the need for full roof replacement.

What is cut edge corrosion treatment?

Cut edge corrosion treatment repairs and seals the exposed edges and laps of metal roof sheets where corrosion has begun. The specialist coating stabilises rust, prevents moisture ingress and restores weatherproofing, stopping further deterioration and extending the lifespan of the roof.

What is Giromax Roofcoat?

Giromax Roofcoat is a BBA-approved metal roof coating system that restores weathered roof sheets, stops corrosion and provides long-term waterproofing. It forms a flexible, UV-resistant membrane that protects steel roofing for 15–25 years without requiring roof replacement.

What is Seamsil?

Seamsil is a silicone-based coating system developed to treat cut edge corrosion on metal roof sheets. It seals laps and exposed steel, prevents further rusting, improves waterproofing and acts as the first stage in full metal roof refurbishment.

What is Liquasil Metalseal?

Metalseal is a silicone roof coating designed for refurbishing metal roofs. It provides long-term corrosion protection, waterproofing and UV resistance by forming an elastic, fully bonded membrane over ageing steel roof sheets.

What is Rooflock PU?

Rooflock PU is a seamless liquid polyurethane waterproofing system for flat and metal roofs. It resists standing water, seals details and forms a durable, flexible membrane that prevents leaks and provides 12–25 years of protection.

What is Cladcoat?

Cladcoat is a high-performance coating system used to restore and protect metal roofs and cladding. It improves appearance, prevents corrosion and provides UV-stable, long-lasting surface protection for commercial and industrial buildings.

Why do metal roofs rust?

Metal roofs rust when the protective factory coating deteriorates, exposing bare steel at edges, laps and fixings. Moisture penetrates these points, causing oxidation and coating delamination. Without treatment, corrosion spreads across the sheet and leads to leaks and structural deterioration.

Why do commercial roofs leak?

Most commercial roof leaks are caused by failed joints, degraded coatings, corroded fixings, damaged laps or poor drainage. Over time, weathering and movement create small gaps that allow water to enter. Liquid-applied coatings seal these weak points and restore waterproof performance.

What do commercial roof coating contractors do?

Commercial roof coating contractors inspect industrial roofs, identify defects, specify the correct coating system and apply it to waterproof, seal and protect the building. They extend roof life, stop leaks and prevent corrosion without requiring costly roof replacement.

Need Advice or a Roof Survey?

We provide expert guidance and nationwide surveys for all commercial roof coating systems including Giromax, Delcote, Seamsil, Liquasil, Rooflock and Alltimes products.

Contact us today to arrange your roof coating survey or to ask a technical question.