Choosing the right flat roofing system is an important decision for any property owner. GRP fibreglass and rubber (EPDM/SARNA) are two of the most popular flat roofing options in the UK, each offering different strengths depending on your needs. In this post, we’ll break down both systems to help you decide what’s best for your home.

GRP (Glass Reinforced Plastic), also known as fibreglass roofing, is a highly durable, seamless flat roofing system. It’s applied using layers of resin and matting to create a waterproof, low-maintenance surface that can last for decades when installed properly. GRP is especially well-suited for domestic extensions, garages, and dormers.

Rubber roofing, including EPDM and SARNA systems, is a flexible, weather-resistant option made from synthetic rubber membranes. These are known for their longevity, UV resistance, and fast installation. EPDM systems are popular for both residential and commercial flat roofs, while SARNAfil membranes are often used in more technical or large-scale applications.

GRP roofing offers a clean, modern finish and excellent durability, but it requires a dry, controlled installation environment. Rubber systems are more forgiving during installation and work well for large, uncomplicated roofs. Both offer long lifespans and minimal maintenance, but your choice depends on the specific needs of your roof.

For example, GRP is ideal for smaller, detailed areas like dormers or extensions, while rubber membranes are often more cost-effective for larger flat roofs. Both systems are fully waterproof, compliant with UK building regulations, and provide excellent long-term performance when installed by a professional.

At Stag Roofing, we’re experienced in both GRP fibreglass and rubber flat roofing systems. We’ll help you choose the right solution for your home based on your budget, roof structure, and long-term goals. With over 15 years of roofing experience and 5-star reviews on Bark and MyBuilder, you can trust us to get the job done properly.

If you're unsure which flat roofing system is best for your property, we’re here to help. Contact Stag Roofing today for expert advice and a no-obligation quote tailored to your project.