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Is GRP the Same as Fibreglass?

Home GRP Is GRP the Same as Fibreglass?
grp roof

When you’re looking to get some kind of fibreglass installed, you’ll typically see the terms “fibreglass” and “GRP” used interchangeably. It doesn’t matter if it’s a flat roof installation to replace felt or a swimming pool renovation, the terms will still appear and you may even get confused at the terms being used.

Fortunately, you don’t need to be confused anymore.

GRP and Fibreglass Are the Same Thing

GRP stands for Glass Reinforced Plastic and is just another name for fibreglass. In fact, you might even hear the term “glass fibre” being used by some contractors. Rest assured that these terms are just interchangeable.

Some people confuse the terms, and it generally depends on the company using them. Regardless of where it’s being used or what country you’re in, the term GRP and fibreglass are both the same.

You might also see the term “FRP” being used in some applications. This stands for fibre reinforced plastic or fibre reinforced polymer. As you might expect, this is completely different to glass reinforced plastic because the material is different. Fibre reinforced plastics are generally used in high-performance applications such as aerospace engineering, and not something you would stick on your flat roof or in your swimming pool. As a result, you’ll want to stay away from FRP if you’re in need of something for the home.

GRP is the lower-end material which is typically used as part of showers, swimming pools and flat roofs, and shouldn’t be confused with FRP. It is, however, the same thing as fibreglass, so if you see these terms being used in the future, you’ll know that they mean the same thing. However, if you see FRP, then you’re probably looking at the wrong website unless you plan to build a car or a rocket to go into space.


Although they have different uses, GRP and FRP are both “composites”, an engineering material that means they’re materials that consist of two or more dissimilar components. The two components are often described as a matrix and a reinforcement. In the case of GRP, the matrix is plastic (or polymer) and the reinforcement is glass fibre.

The purpose of combining two materials to create a composite is to get the advantages of both. In the case of GRP, it takes on the lightweight qualities of resin but the sturdiness of glass fibres. It can also be melded into various different shapes, much like plastics in general and will remain sturdy thanks to the reinforcement from the glass fibres.

Composites are commonly used when meeting specific engineering challenges. Although some materials are typically only seen in high-end applications, more affordable versions (such as GRP vs FRP) can easily be used in residential or even commercial applications.

If you’re in the Essex area and want to get in touch with a fibreglass specialist, then contact us online or over the phone. You can fill in our form and we’ll arrange a call back within just 30 minutes. If you prefer, you can visit us in-store, call us on 07899 856 291, or email us at sales@gee-grpfibreglassing.co.uk.

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