NBS Source
Stormdry Repointing Additive No.1


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.

General information

Uniclass 2015

Ss_15_30_50_55 Mortar repointing systemsPrimary


F10/665 Pointing

Z21/180 Admixtures for site made cement gauged mortars

Specification data - Mortar repointing systems

Product Reference

Stormdry Repointing Additive No.1

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.

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