NBS Source
Stormdry Repointing Additive No.2


A flexible waterproofing admixture that is diluted with water. Can be added as a gauging solution to sand:cement repointing mixtures. Suitable for use where flood protection is required or where there is a high incidence of driving rain.

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

Test work demonstrates that repointing with Stormdry Repointing Additive No.2 and applying Stormdry Masonry Protection Cream to a wall can greatly reduce the flow rate of water through it. At a flood water height of 0.6 m, the flow rate through a single skin Fletton brick wall is reduced from approximately 12.5 L/m² /min to less than 0.2 L/m² /min.


  • Improves flood resistance.
  • Significantly reduces the liquid water absorption of masonry.
  • Easy to mix into the repointing mortar mixture.
  • Functions with both cement- and lime-based mortars.

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.2

Standard product features


One 500 ml bottle will provide sufficient mortar to repoint an area of approximately 2.5 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.2 to four parts water by volume.

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