Specification of GRC

It is essential that your chosen supplier is a Full Member of the GRCA, and that they manufacture GRC in accordance with the current GRCA specification.

Pennine Stone are Full Members of the GRCA as well as achieving ISO 9001:2015 and ISO 14001:2015 accreditations.

The PDF file gives full details of the GRCA Specification.

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Testing of GRC

Ensure that your chosen supplier is regularly testing in accordance with the GRCA Specification and Methods of Testing guidelines.

Ask your supplier for details of Test Results

Pennine Stone uses an independent accredited testing house to ensure products achieve the required strength and verified results are available on request.

The PDF file gives full details of the GRCA approved Methods of Testing.

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Specifiers Guide

Pennine Stone has been manufacturing since 2002 – ensure your GRC supplier has the necessary infrastructure and expertise for your project.

The PDF file gives some important guidelines which specifiers should consider when using GRC.

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Cleaning of GRC – Premix & Spray

The composition of the material provides good retention of the supplied appearance. However, if the components do require cleaning the following is a suggested order of appropriate procedures:

  • Wet the unit and scrub the area with a stiff brush, rinse off with clean water
  • Use a jet wash to remove marks
  • Use a mild acid wash - scrub the whole of the unit not just the localised area

Should you have any further questions or concerns please ring our GRC Technical Department on 01302 720553.

Glassfibre reinforced concrete


PreMix Glass Reinforced Concrete is usually poured into wooden or GRP moulds. The resulting product may be very detailed and intricate. Suitable for most applications.


Grade 18 Sprayed Glassfibre Reinforced Concrete has outstanding strength properties and is used for larger panels and high wind loadings.