Checkout: £0.00
Click to zoom
Stormseal, the breathable & Invisible brick & masonry water-seal you CAN apply in damp conditions. Unlike conventional surface damp treatments, Stormseal doesn’t rely on dry weather for successful application. Effectively seal damp external walls, even in winter.Read More
Due to ADR regs on transport of flammables we can only send 25L drums of solvent product via premium rate special carrier, hence minimum FREE carriage order is 4 x 25L or ring for a quote. Alternatively, you can still collect single 25L drums at our Ulverston or Glasgow trade counters.
phone01229 869100
We would only use this to contact you to discuss your experience with our products.
When we talk about damp in a property, our thoughts almost automatically turn to “rising damp” whereas in reality “penetrating damp” is by far the more common problem. In winter some walls simply never dry out, as even on dry days they may remain shaded and cold, especially on north-facing elevations. This can be frustrating, as the “Achilles’ heel” of most liquid water seals, is that you have to wait for the wall to dry out before applying them. Paradoxically when you need them most, you just can’t use them!
Stormseal is different, it positively thrives on application to damp surfaces. In point of fact, it doesn’t work properly unless the wall is damp! This single innovation makes Stormseal the most versatile water-seal available and facilitates all year-round control of lateral penetrating damp.
This latest version of Stormseal has many outstanding features, including:
Lateral penetrating damp describes what occurs when an external wall becomes saturated and subsequently transmits that moisture to the inside of a building, usually exhibiting as damp patches on the plaster and other decorative finishes. The problem arises for two basic reasons:
a) Building materials deteriorate over time or were weak to begin with
b) Water is a relentlessly persistent invader
The deterioration is often gradual over many years. Mortar joints crack with repeated freeze/thaw expansion and contraction, which provides a path for rainwater to enter the structure. Or perhaps the stonemasonry has some “soft” stones which absorb moisture, especially during periods of prolonged stormy weather. It could even be that a poorly installed window cill or stone lintel is causing a small reservoir of water to accumulate or “pond”. Brick walls also deteriorate over time and may become porous, especially if they are solid as opposed to cavity construction.
There are innumerable variations on the above theme, but the resulting moisture penetration results in all the same outcomes: damp plaster, black mould, degraded air quality and timber decay.
Of course, one product alone will not solve all penetrating damp issues, but Stormseal provides builders, homeowners & damp proofing professionals with a significant defence against the problem and crucially, without having to wait for dry weather. It limits the absorption of water, which is the starting point for most decay.
It achieves this by embedding an invisible hydrophobic shield, developed from solvent-free polysiloxanes, which are susceptible to hydrolysis. Hydrolysis occurs only after application to the substrate. This then reduces the capillary absorption of the wall which it has penetrated but does not block pores or capillary channels. There is therefore little or no impairment to the wall’s ability to breathe.
Stormseal can be used in many penetrating damp situations including:
Indirectly it may also reduce condensation. A weakened solid brick or stone wall may absorb moisture to an extent that is hidden deep in the masonry, without actually pushing all through to the plaster. This can be described as partial porosity and it nevertheless exerts a significant cooling effect on the wall, especially in winter because when the moisture evaporates off, it carries heat away with it.
Stormseal restricts the ability of absorbent building materials (old bricks, soft mortar joints etc.) to soak up that moisture in the first place, with two effects:
a) Evaporative heat loss (described above) is greatly reduced
b) Condensation “cold spots” are eliminated from internal walls
Other vulnerable areas of masonry include parapet walls and chimneys, both of which benefit from maintenance applications of Stormseal.Chimneys have a very specific range of problems, especially in older properties (e.g. Georgian and Victorian) because decades of burning coal will have left deposits of sulphates, nitrates and carbon within the chimney.When these come into contact with moisture and the chlorides naturally present in bricks, sand and stonework, the resulting cocktail can be impressively corrosive.Apply Stormseal to prevent rainwater from providing that destructive catalyst, even in tough winter conditions that would frustrate conventional water repellents.
Brick walls, stonemasonry and rendered finishes should be thoroughly cleansed of all dirt, carbon deposits, green mould, moss and other organic growth. Where the mortar joints are in good condition and there are no “blown” brick faces, careful pressure washing with a fan nozzle (do not use “rotary jet” or “turbo” nozzles) will provide rapid removal of most contaminants. Where the substrate is considered fragile, use Kingfisher Eco Brick Cleaner to remove carbon and salt staining. Agitate with a scrubbing brush and repeat cleanse/rinse cycle two to three times if necessary. Moss accumulations may be removed by scraper and/or wire brushing.
Often when organic matter is cleansed from an external wall it is prone to grow back again with a vengeance. This seems counter-intuitive until you understand that cleaning may remove the moss growth for example, but it also spreads the invisible spores around too, which quickly re-establish, often to a wider area. An application of Kingfisher Bio-Wash kills these spores and micro-root systems, so is considered an essential surface preparation before applying Stormseal.
Cracked, softened or even dislodged mortar joints are a common source of moisture ingress and no breathable water repellent alone, will remediate such issues. Loose cement or lime mortar should be mechanically raked out to a depth of at least 20mm and new mortar pointed in to create a water-proof joint. We recommend Kingfisher Pointing Mortar & Pointing Solution for best results.
a) Stormseal is a ready-to-use formula and should be applied directly to the porous brick, stone or render. Do not apply to engineering brick, dense stone (granite), polished stone or marble.
b) If the substrate is dry, spray mist with clean water using a manual pump sprayer. The objective is for the surface to appear damp but not glistening wet so that the moisture draws in the active formula without dilution.
c) 2 coats “wet on wet” should be applied or perhaps more accurately; “wet on damp”. As for the water misting, you are aiming for the first coat to have soaked in just enough that the surface is not glistening, before applying the second coat. Apply to refusal by brush or low-pressure sprayer.
d) We suggest starting at the top of the work area and working downwards, allowing runs and drips to be captured and spread by brush (even if the main method of application is spray). Work in the horizontal plane and avoid spraying overhead.
The coverage rate is 4 to 5 sq m per litre, so a 25-litre drum of Stormseal should treat at least 50 sq m with the recommended two coats.
a) Do not apply to engineering brick, dense stone (granite), polished stone or marble
b) Do not apply during precipitation
c) Cover up if rain expected within 4 hours of application
d) Not for use indoors unless well ventilated during application and curing
As always, we recommend that you read the Technical Data Sheet & Safety Data Sheet thoroughly before commencing any work. If in doubt please call us for advice, we are here to help.
Two primary delivery options for smaller U.K MAINLAND orders (Typically under 100 Kg):
Standard 3-day service: £6.25 plus VAT (Note: Highlands Postcodes may be up to 5 working days)
Next Working Day*: £13.95 plus VAT (Not available to Highlands Postcodes)*Excludes weekends and public holidays
Cut-off time for “Next Working Day” orders to be processed is 12:00 noon. Once your goods have been despatched, you will normally receive a confirmatory e-mail with tracking details so that you can check the progress of your order. Details
Yes - Stormseal is specifically designed to work on damp walls and actually requires moisture to activate correctly. The polysiloxane formula undergoes hydrolysis (a chemical reaction with water) that creates the waterproof barrier. If your wall is dry, simply mist it with water before application. This makes Stormseal ideal for winter damp emergencies when traditional sealants are useless.
No - Stormseal is 100% breathable and micro-porous. It reduces capillary absorption (water soaking through) while maintaining vapour permeability (moisture can still escape). This is crucial for solid brick walls and heritage properties where trapped moisture causes more damage than penetrating damp itself.
Most water repellents are solvent-based or spirit-based and require completely dry walls before application. Stormseal uses solvent-free polysiloxanes that need damp conditions to work. This means year-round application without waiting for dry weather - the key advantage when north-facing walls never fully dry out in winter.
Yes - Stormseal is ideal for heritage buildings because it\'s breathable and works with lime mortar. It won\'t trap moisture or cause the damage that modern barrier coatings inflict on old walls. Particularly effective on chimneys where sulphate deposits from decades of coal burning become corrosive when wet.
Yes, if joints are cracked or loose. Stormseal isn\'t a substitute for proper repairs - it works alongside sound pointing to prevent water ingress. Rake out damaged mortar to 20mm depth and repoint before sealing. Stormseal then protects both the brickwork and fresh mortar joints from future moisture penetration.
We find this does an excellent job. Have used it on various surfaces.
Reviewed by Terry Letheby
This product is amazing and the service was fantastic would highly recommend the product and staff.
Reviewed by Sarah Walkup
With the extreme weather we had in the early part of this year and December of last, I had a high number of customers who were suffering from water ingress. A few of these were down to penetrating damp along. As the walls were saturated we couldnt use solvent based repellents. With Storm Seals wet on wet application we were able to apply the treatment with quick results. On two properties we revisited within 48 hours, Water was beading on the surface. Wish Id found this product earlier! With regards to deliveries, My last order was extremely quick, same day.
Reviewed by Steve Lyden
Due to the terrible weather we have had in cumbria, some houses were subjected to flooding and for those on higher ground like myself, it was driving penetrating damp that was the issue. After two coats of stormseal on my gable wall, applied during rain spells, the water began to bead on the surface and after a couple days, dampness stopped coming through the wall. Incredible product, does exactly what it says it would do.
Reviewed by Tim O'Neil
All fields marked with an * are required. If you are sending a photo, please allow time for the contact form to upload the photo. Please do not click refresh after clicking send until the form is submitted.
Bio-Wash Green Algae Remover is a powerful, concentrated biocidal solution specifically formulated to eliminate damaging green algae, mould, and organic growth from external mineral surfaces. This deep-penetrating treatment targets the root cause of surface deterioration, making it an essential tool for property maintenance and surface preparation.
Kingfisher Extreme Climate is the ultimate high-performance brick sealer and masonry water seal for harsh environments. This professional-grade brickwork sealer is applied in just ONE COAT and provides 100% breathable surface protection for damp brick walls, sandstone, limestone, granite and more. As the UK's leading wall sealer, it uses the latest hydrophobic technology to offer unparalleled performance and versatility even in the most exposed locations.
A heavy duty 20 Litre capacity backpack sprayer ideal for applying Biocidal wash to paving / roof tiles. Use sprayer with water based products only.
