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Fibreglass Flat Roof - Everything you need to know

The fibreglass flat roof market in the UK and Ireland is one that has delivered year on year growth over the past 20 years.

Its success is built on a solid foundation of reliability, ease of use and readily available materials.

To delve a little more into each of these success factors we can examine each component a little more closely.


Boat building and repairs was one of the primary usages for fibreglass. Its durability was tested on the harsh conditions of the sea. Its reputation in boat building has also been transferred to the fibreglass roofing industry.

One all materials have been applied to the recommended guidelines, a fibreglass flat roof will last in excess of 20 years. Its seamless finish is paramount to its success as a watertight, robust method of flat roofing.

FibreGlassDirect have a recommended guide of installation tips and tricks, it can be downloaded from our site.

Ease of use

Fibreglass roofing is a process consisting of 3 core steps – Application of roof trims, Lamination and Topcoat application.

The application of roofing trims is the first stage to attend to once all OSB3 Boarding has been screwed down. Once the correct trims have been selected, silicone is applied and the trims are nailed down using galvanised nails as these will not rust.

Secondly, the lamination phase takes place. The lamination phase consists of a catalysed resin and a fibreglass material. In the case of a fibreglass flat roof build, chopped strand matting (csm) is most suitable. Generally 450g matting is sufficient for a standard fibreglass roof build. In some cases however, it will be necessary to use 600g or 900g (or layers of 900g) if the roof is to be used as a walkway or balcony.

Once cured, a fibreglass roof will be completely tack free. Its smooth flat appearance will ensure the roof remains easy to clean and maintain. If needed the roof can be easily washed down with a hose and cleaned with a brush.

Readily available materials

As the fibreglass roofing industry has grown, so has the amount of fibreglass flat roof suppliers. FibreGlassDirect is proud to be one of the largest and most experienced suppliers in the fibreglass industry. Our roofing materials have been tried and tested over 30 years all over the UK and Ireland.

All materials needed to complete fibreglass flat roofing project are available to buy from our comprehensive online shop. With fast delivery times, we can ensure your order is with you within hours of order placement.

FibreGlassDirect is also on hand to offer any advice to our customers regarding their fibreglass flat roofing projects. Don't hesitate to contact any member of our technical team who would be happy to assist you with your inquiries.