Benefits of Fibreglass Flat Roofs


Whether you want to improve your existing roof or repair it, you will look at the different roofing options for your home. If you have a flat roof, one of the prevalent options you will be looking at is the fibreglass flat roof.

Fibreglass flat roofs are usually installed on sheds, school buildings and outbuildings. It is suitable for both commercial and non-commercial use.

So, how much does a fibreglass roof cost?

The average cost of installing a fibreglass roof in the UK starts from around £210 per square. Whilst this is considered expensive, fibreglass is a valuable investment.

Here is why?    

Low maintenance

One of the most valuable things about installing a flat fibreglass roof is that it needs minimal maintenance. However, it needs to be cleaned regularly. But the good news is this does not require a lot of money because you can clean it yourself. All you need is a mop, a bucket, and a broom. As long as you can access the roof, you can clean debris, leaves, dirt and all the things that the wind might bring to the roof.

Below are some of the things you can do to maintain your fibreglass flat roof:

  • Use a garden hose to clean the area, gently removing the dirt and grime that might have settled there over time.
  • Clean regularly – as often as you clean your home.
  • Add an extra paint coat layer. The paint provides an extra layer of protection from moisture and keeps the roof insulated.


Fibreglass is strong and sturdy, and it has a long lifespan. It can handle a lot of foot traffic if needed. Do you have workmen working on your roof on regular bases? Not to worry; a fibreglass roof can take it.

Once the fibreglass is installed, it can last for over twenty-five years. Some even last over thirty years, but this is when it is looked after and maintained well. This beats the usual decade-long-lasting life spans of other roofing options.

It also means you won’t need to spend a fortune fixing it often. However, as usual, you need to ensure that maintenance work is done every year to ensure that the roof is still in working order.

As long as the roof has been installed correctly by accredited professionals – the fibreglass roof should be able to last as long as possible.

Find out more about fibreglass roof costs here.


Although fibreglass is strong, it is also flexible. So, for example, if you use GRP fibreglass or GP flex fibreglass, which offers 100% flexibility and increased elasticity – you’ll be able to coat almost all roof surfaces. With this being said, once the job is complete, anyone can walk on the fibreglass roof from thirty to sixty minutes afterwards.

In addition, whether you are applying the fibreglass roof over concrete, felt, asphalt, metal, or any other roof type, there will be no need to strip the roof beforehand.

Lastly, fibreglass can go over any material. You can choose from various trims to match the roof build. It can easily be tailored to fit the shape of the existing roof. This makes it an efficient and speedy task.


Even without adding a resin matting base coat layer to a fibreglass roof finish – it still has waterproofing qualities. Although adding the extra base coat layer is essential after the job is complete, the fibreglass roof is already waterproof beforehand. Sometimes, the building roofer may come back another day to add the finishing coat to the fibreglass roof to give it extra protection from water damage.

So, what other reasons should you use a fully waterproof material for your flat roof?

There are quite a few instances where you would want to ensure the things inside your building are protected from water damage. Having a waterproof fibreglass roof can come in handy, especially in the following instances:

  • When you are building a roof over your balcony and want to protect it from getting battered by the rain, depending on the material used on the balcony railing, rain can cause rust over the long term.
  • When building a fibreglass roof for your shed – where you keep valuables inside.
  • When building a fibreglass roof over an outbuilding – with electricals and PC equipment inside.

So, why should you choose fibreglass for your flat roofing material? 

There are many reasons you will consider using fibreglass. First, it will last a long time, well over thirty years, if maintained well. You can look after it with basic cleaning materials, and it can protect your building from water damage. Lastly, it is essential to ensure that although the fibreglass is long-lasting – annual checks should still be carried out to ensure that the fibreglass is still in a suitable condition. When you do all this, you will be ensuring that the fibreglass lasts as long as possible.