If you’re considering GRP fibreglass roofing, it’s an excellent choice for replacement flat roofs. As one of the most state-of-the-art roofing solutions on the market, it comes with a multitude of benefits, including guarantees of up to 25 years and a sealed watertight system.

But how is a fibreglass roof installed? Read on for an insight into the best techniques.

Ideal roofing guides - how is GRP fibreglass roofing installed?How Is a GRP Fibreglass Roof Applied?

Applied as a cold liquid, GRP fibreglass is ideal for flat roofing, and it can be moulded into any shape, making it a highly flexible option. The ‘GRP’ part of its name stands for ‘glass reinforced plastic’, meaning it contains small glass fibres to make it as strong as possible.

Fibreglass often replaces traditional felt roofing systems because the seamless finish once it’s dry produces a leak-free roof that doesn’t rip, crack or tear over time. If you do need roof repairs, they’re easily completed at the exact site of the damage. However, this is rarely required if the roofing is installed correctly.

Best Weather Conditions

Due to the liquid application, GRP fibreglass should only be installed when weather conditions are dry. Your roofer will let you know if it’s too hot or cold outside to complete the job to the required quality standards, ensuring it cures properly.

The Installation Process

How the GRP fibreglass roofing is installed may vary between contractors and the brand used, but there are some general steps taken. Luckily, it’s one of the safest, simplest and quickest types of flat roof to install.

  1. First, a base must is laid for the liquid to be applied on. The material of choice is often OSB wood (oriented strand boards) or a tongue and groove roof deck to ensure the laminate will stay in place between the joints. The rough texture of the surface allows the resin to stick firmly on the board. Many flat roofs already have these present at the right pitch. If so, the next stage can begin, which involves applying the layer of resin.
  2. Once all edges and borders are secured with trims and the first layer of catalysed resin is laid, the fibreglass matting is positioned to create a completely even surface before applying more resin on top.
  3. Once cured, a top coat is required to achieve a final seal, smooth finish and an attractive appearance. Your roofer may adjust the technique and mix according to the use of the fibreglass. For example, a non-slip finish is required if the surface is going to be regularly walked on, especially in wet weather.

Need a new roof?

South Thames Roofing provides an array of high-quality solutions, including GRP fibreglass roof installations. We offer roofing services in South London and Surrey, covering areas of Morden, West Molesey and Belgravia. If you’d like to arrange a no-obligation chat about your requirements and receive a free estimate, call now on 0208 397 2900.