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300g Fibreglass Matting

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About Fibreglass matting 300g & buying advice

Shop 300g fibreglass matting for installing a 300g light-duty GRP fibreglass roof over a suitable OSB3 or timber deck. This page helps you choose the right option, check compatibility and move to the best CRS product route before ordering.

Buying guide

Choose 300g Fibreglass Matting for installing a 300g light-duty GRP fibreglass roof over a suitable OSB3 or timber deck.

Good choice when

  • Use this category for installing a 300g light-duty GRP fibreglass roof over a suitable OSB3 or timber deck.
  • Use it when the surface is new OSB3 or suitable timber roof deck.
  • Use it when the measurements, preparation work and related accessories have been checked.

Consider another route when

  • Do not use this category when the existing roof only needs a quick repair, coating or overlay rather than a new GRP system.
  • Do not use it when the roof is unsafe or unsuitable without preparation.
  • Do not use it as a shortcut if another CRS system is a better fit.

Next step: Choose the kit weight, check the roof size, then add the correct trims and tools before ordering.

Frequently asked questions

Which GRP kit weight should I choose?

Use 300g for small light-duty roofs, 450g for standard domestic roofs and 600g where a heavier-duty build is needed.

Do GRP kits go over old felt?

Traditional GRP kits are normally for new OSB3 or suitable timber decks, not for coating directly over tired felt.

Do I need trims with a GRP roof kit?

Most GRP roofs need the correct edge, wall, corner or drainage trims to finish the roof properly.

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