EPDM vs GRP Fibreglass – Which Is Best?

At Collier Roofing, we know how important it is to choose high-quality roofing for your property. Two of the types we’d highly recommend for your flat roof are EPDM rubber roofing and GRP fibreglass. However, the right choice can depend on which features are most important to you. Here are some of the differences and ways to identify the best roof for your home.

Flat roofing system guides - EPDM vs GRP Fibreglass roof materialsQuality

Both EPDM and GRP fibreglass are some of the best flat roofing systems on the market, so quality won’t be an issue with either solution. The quality of the material and how well it’s installed is going to come down to the roofing company you choose for the job. Both solutions require someone trained and competent to fit them, so ensure your roofer has credentials you can check. Ask for details of their accreditations and always read reviews on Checkatrade.


Both types of roofing are incredibly durable, and you’ll receive impressive guarantees, which are usually for a longer period than traditional felt flat roofs. However, GRP fibreglass roofing is one of the most robust flat roof systems available thanks to the layer of fibreglass resin matting and top layer coating. This forms a laminate over the area which isn’t easily damaged. For this reason, it’s often chosen if the flat roof doubles as an area which will be accessed or experiencing footfall, including spaces with outdoor seating, such as balconies.

Weather Resistance

EPDM is highly waterproof, helping to protect your home from the elements, and it’s even resistant to algae growth. It can also be used for other parts of your roofline, such as guttering. GRP fibreglass roofs are also highly weatherproof, with a fully bonded structure and seamless fabrication, meaning no moisture can penetrate the material. Both are resistant to issues such as cracking, blistering and rot, so you should find your repair bills decreasing if upgrading to either of these roof systems.

Ease of Installation

EPDM is often faster to install because the rubber membrane is applied cold, with an adhesive used to fix it to the property rather than heat or flames. The same goes for GRP fibreglass, so it’s often quicker to install than traditional flat roofs. However, it may take a longer to finish than EPDM roofing because of the different layers which need to be applied, so the process can be more complex.


If you have a tight budget but need a flat roof which is still of high quality, EPDM is the most cost-effective option. GRP fibreglass is often the more premium product, but this needs to be balanced with the fact it can be the stronger and longer-lasting of the two.

Whether you’re looking for affordable roofing solutions or the highest quality flat roof material on the market, Collier Roofing is here to assist. We operate across Surrey, London and nearby locations, including Kenley, Chipstead and Coulsdon. Get in touch for a free quote.