Stormdry Masonry Protection Cream
  • Waterproofs masonry
  • Deeply penetrating formula
  • 25 years protection

For more information call 01403 210204

Stormdry® Masonry Protection Cream

Standards & Accreditations
CERTIFICATE 15/5198
Certificate 15/5198

Stormdry is a colourless [1], breathable, water-repellent treatment for brick, concrete and stone [2] 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:

  • Protecting against penetrating damp (rain penetration)
  • 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

Breathable and Long Lasting

Experiment showing air permeating through treated brick slip

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

Penetration depth of Stormdry into brick

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 to the right 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.

Effective

Stormdry has been tested to BS 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.

Improving the Thermal Performance of Masonry

Thermographic image showing heat loss through walls

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 27% are possible when Stormdry is used on single-skin walls due to reductions in thermal conductivity. This has been verified in an independent report carried out by environmental consultants, Giraffe Innovation. When the effects of reduction in evaporative cooling are taken into account, total energy savings of up to 29% are possible.

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. Please contact our technical department on 01403 210204 or submit an enquiry for details.

Stormdry Application

  1. Stormdry cream surface preparation
    Remove any loose mortar, dust etc... using a masonry brush. When biological growth such as moss, algae or lichen needs to be removed, apply SoluGuard Multi-Surface Biocide in accordance with instructions.
  2. Stormdry cream brush application
    Stormdry can be applied by brush around details such as windows. Care should be taken to ensure that Stormdry does not splash onto glass, paintwork, plants, etc. Any splashes should be cleaned away with warm soapy water.
  3. Stormdry cream roller application
    Larger areas can be covered more quickly using roller application. Stormdry can also be applied by electric roller or airless spray – contact our technical department for details.
  4. Stormdry cream treating missed areas
    Check for any “missed” areas that have not been treated (e.g. voids in brickwork, deep mortar beds) and apply Stormdry to these areas using a brush.
  5. Stormdry cream white appearance
    Stormdry appears white immediately after treatment – making it easy to tell which areas have been treated.
  6. Stormdry cream opacity change
    15 - 20 minutes after application, Stormdry starts to penetrate into the masonry and the whiteness will fade.
  7. Stormdry cream maintains walls original appearance
    After 24 - 48 hours the wall will have returned to its original appearance.
  8. Stormdry cream beading effect
    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. The masonry will be resistant to light rain after two to four hours.
  9. Stormdry cream absorption test
    A Stormdry Gauge can be used to demonstrate the effectiveness of the treatment. The test should be carried out at least 28 days after applying Stormdry which allows the water absorption of the wall before and after treatment to be compared.

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 on 01403 210204 or submit an enquiry for information on water-repellent treatments for limestone.

[1] The coverage rate will vary depending upon the roughness and absorbency of the surface, use as a guide only.

Appearance Thick, white cream
Density 0.86 g/cm3
Size(s) & Packaging 3 litre, 5 litre and 20 litre plastic buckets
Coverage 5 m2 per 1 litre [1] (Single coat application)
Penetration 12 mm on Fletton brick
Service Life 25 year BBA accreditation
Storage Store in a cool, well ventilated area. Keep container tightly closed. Protect from frost
Shelf Life 18 months

Suggested NBS specification clause: M60-170

Visit our NBS page for further information on specifying Safeguard products using NBS.

Do I need to stir Stormdry Masonry Protection Cream before use?
It is not essential to stir the product before application, however if a film is present on top of the product upon opening the tub, one can stir the product in order to maintain consistency.
How do I wash my paint brush / roller?
Washing of brushes and rollers can be done using a solution of washing up liquid (detergent) and water.
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For more information call 01403 210204