Stormdry is a colourless1, breathable, water-repellent treatment for brick, concrete and stone2 walls. It is supplied in the form of a deeply penetrating cream that is applied to the wall surface using a roller or brush. Once Stormdry has been applied to the wall surface, it will permeate deeply before curing to form a water-repellent barrier. Typical applications for Stormdry include:
Improving the thermal resistance of masonry by keeping it dry (energy saving)
Improving the performance of cavity wall insulation by protecting it from moisture
Improving flood resistance of masonry
Stormdry Video
Breathable and Long Lasting
Stormdry is based on carefully selected silanes and siloxanes which line the pores of the masonry to form a water-repellent silicone matrix. Because it works by lining the pores rather than blocking them the masonry is allowed to breathe and does not suffer from increased frost damage (spalling). Due to its novel formulation and deep penetration, Stormdry is resistant to UV light and other forms of degradation, resulting in a life expectancy of 20-30 years.
Deeply Penetrating
Stormdry is able to penetrate more deeply into masonry than traditional liquid-applied masonry water repellents. As well as increasing life expectancy this also improves Stormdry's crack-bridging ability. As the diagram below shows, Stormdry is able to provide water-repellency beyond the depth of small cracks:
It should be noted that larger cracks will still need to be filled as part of the Stormdry treatment. Mortar lines may need to be repointed with a sand/cement or sand/lime mix incorporating Stormdry Repointing Additive.
The time lapse video below shows how Stormdry penetrates in to brick:
Effective
Stormdry has been tested to EN ISO 15148:2002 (E), demonstrating its effectiveness on concrete, mortar, brick, and sandstone. The graph below shows that the water uptake for Stormdry treated samples was considerably lower than for untreated samples:
As Stormdry is formulated to penetrate deeply into masonry it can take up to two months after application for a noticeable "beading effect" to appear when rainfall strikes the wall. However, Stormdry is resistant to rain after just 12 hours. This can be confirmed by using a Stormdry Gauge (pictured below).
Stormdry gauge
Beading after 2 months
In common with most other masonry water repellents, Stormdry's beading effect will become less pronounced after two or three years. However Stormdry will continue working for 20-30 years. Once again this can be confirmed by using a Stormdry Gauge.
Improving the thermal resistance of walls through the use of conventional insulation is not always practical - particularly where older buildings are concerned. Many homes and commercial properties in the UK are built using single-skin walls, making them unsuitable for cavity wall insulation. The installation of internal insulation can be disruptive and takes up valuable living space whilst externally applied insulation is often unattractive.
Fortunately, Stormdry offers a solution. It is a well-known fact that porous masonry materials such as brick, stone, concrete, and mortar are worse insulators when they are wet. By preventing the absorption of water, Stormdry ensures that the insulation properties of the masonry are maximised throughout the year. Tests carried out using Stormdry at the University of Portsmouth and subsequent SAP analysis showed that energy savings of up to 29% are possible when Stormdry is used on single-skin walls.
Improving the Flood Resistance of Masonry
Stormdry can be used to increase the flood resistance of masonry as part of a flood resistance or resilience system. It is particularly effective when used in conjunction with repointing up to design flood height using a mortar incorporating Stormdry Repointing Additive No.2.
When used as part of a cavity drain flood protection system (e.g. Oldroyd Xv), Stormdry will increase the primary resistance of the masonry - reducing the risk of ingressing flood water overwhelming the pumping system. Contact our technical department for details.
Stormdry Website
Further information about Stormdry Masonry Protection Cream and related products can be found on the Stormdry website, www.stormdry.com. Alternatively click the links below to be taken to specific pages:
1) Application of Stormdry Masonry protection Cream may cause some slight darkening to certain substrates. Although this will usually fade over time, a small, representative and inconspicuous test area should always be treated before full treatment begins.
2) Stormdry Masonry Protection Cream is not suitable for use on pure limestone (e.g. Portland Stone). Please contact our technical department for information on water-repellent treatments for limestone.
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Stormdry is a colourless1, breathable, water-repellent treatment for brick, concrete and stone2 walls. It is supplied in the form of a deeply penetrating cream that is applied to the wall surface using a roller or brush. Once Stormdry has been applied to the wall surface, it will permeate deeply before curing to form a water-repellent barrier. Typical applications for Stormdry include:
Stormdry is based on carefully selected silanes and siloxanes which line the pores of the masonry to form a water-repellent silicone matrix. Because it works by lining the pores rather than blocking them the masonry is allowed to breathe and does not suffer from increased frost damage (spalling). Due to its novel formulation and deep penetration, Stormdry is resistant to UV light and other forms of degradation, resulting in a life expectancy of 20-30 years. 
NBS Clauses
Stormdry
