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A waterproofing admixture that is diluted with water. Can be added as a gauging solution to sand:cement or sand:lime repointing mixtures.

Product appears as a white/ milky liquid. Should be applied to the raked-out joint using a suitable pointing iron or repointing gun.


  • Significantly reduces the liquid water absorption of masonry.
  • Easy to mix into the repointing mortar mixture.
  • Functions with both cement- and lime-based mortars.
  • The modified mortar is breathable.

Standard product features


One 500 ml bottle will provide sufficient mortar to repoint an area of approximately 5 m² of masonry.


  • Before repointing mortar is applied, raked-out mortar joints should be wetted, e.g. by flicking water using a wet brush.
  • To be diluted with clean tap water in the ratio of one part Stormdry Repointing Additive No.1 to nine parts water by volume.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
10-70-65/155 Mortar repointing system

NBS Specification

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This product is associated with the following NBS clauses:

Product specification

An important note about specifying



Safeguard Europe Ltd


+44 (0)1403 210204

Product reference

Stormdry Repointing Additive No.1

Manufacturer details

Redkiln Close,
Redkiln Way,
West Sussex, RH13 5QL
Tel +44 (0)1403 210204
Fax +44 (0)1403 217529
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