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IGN 4-34-02 Issue 1 Specification for Glassfibre Reinforced Plastics (GRP) Sewer Linings

This is one of a number of specifications which have been prepared by WRc in consultation with manufacturers and the Water Industry in order to assist engineers responsible for renovation of sewers. It specifies Glassfibre Reinforced Plastics (GRP) sewer linings suitable for Type I and Type II designs as defined in the Sewerage Rehabilitation Manual published by the Water Research Centre.

Type I design requires a bond between the lining and the grout, Type II design does not. Linings manufactured to this specification may be used for Type II applications, in which case a rough backing is not required.


One or more ‘Common Editorial Caveats’ apply – see ‘WIS & IGN Library / Navigation & Caveats’ for details.

Based on the Standards Board’s enquiries (FWA, UKSTT, PIG & SRCG representatives – Autumn 2021) it understands that GRP sewer lining is a very popular technique. However the IGN does need to be reviewed in relation to subsequent BS & EN publications (particularly BS EN ISO 11297-Part 5.

The review might also cross-reference the relevant ISO standard(s) mentioned in the current draft IGN being submitted for public comment by the SCRG.

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