BBA Approved


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Masonry Protection Cream Surface preperation for Stormdry

  • Waterproofs masonry
  • One coat application
  • Limits biological growth
  • Verified by the Energy Saving Trust
  • Can be used on a variety of substrates
  • BBA Approved (25-year durability)

What is Stormdry Masonry Protection Cream?

Stormdry is a deeply penetrating water repellent cream for brick, stone, and concrete. Due to its cream-based formulation it is able to penetrate more deeply into masonry than standard liquid-applied water seal products.

Stormdry is based on proven silane/siloxane technology and works by lining the pores of the masonry rather than blocking them - allowing the wall to continue to breathe. This is in contrast to many standard brick sealer and stone sealer products which coat the masonry with a thin film.

Stormdry is easy to apply using a brush or roller and only a single coat application is required - many competing water repellent products require two coats.

25-Year Durability

Stormdry is the only colourless masonry water repellent treatment that carries BBA approval (cert. number 15/5198). After extensive testing to determine continued water-repellency after aggressive freeze-thaw and UV exposure, the BBA issued a certificate with the followiung durability statement:

the product will remain effective as a masonry water repellent for 25 years.

Dry walls are warm walls

Stormdry ensures that the masonry remains dry throughout the year – maximising its thermal resistance or "R" value. Stormdry is verified by the Energy Saving Trust. Dry walls are better insulators than wet walls.

Flood Protection

Used in conjunction with Stormdry Repointing Additive No.2, Stormdry is able to increase the flood resistance of masonry without altering its appearance.

Stormdry - Preparation & Application

Stormdry should only be applied to dry, porous surfaces. It should not be applied over sealed or painted surfaces and is intended for aboveground use only. Only apply when rain is not forecast for the next 24 hours. For the treatment to be successful it is essential to check all joint and roof connections. Hairline cracks up to 0.3mm can be ‘bridged’ by Stormdry, however, it may be necessary to fill cracks in brick/ stonework and repoint using a suitable sand/lime or sand/cement mortar incorporating Stormdry Repointing Additive. Dirty surfaces should be cleaned before the application of Stormdry Masonry Protection Cream to the recommendations given in BS8221-1:2000, “Code of practice for cleaning and surface repair of buildings. Cleaning of natural stones, brick, terracotta and concrete.” DO NOT USE DETERGENTS. Application to structures containing high levels of salt should be avoided.

Test Area

Stormdry has been formulated to be colourless once cured. However, very slight darkening may occur when it is applied to some substrates. Although this will usually fade over time, a small, representative and inconspicuous test area should always be treated before full treatment begins.


  • Carry out surface preparation

  • Use a brush to apply around details such as windows

  • Larger areas can be covered more quickly using roller application

  • 15-20 minutes after application, Stormdry starts to penetrate into the masonry

  • After 24-48 hours the wall will have returned to its original appearance

  • The masonry will be resistant to light rain after two hours.