Water Seal for Brickwork, Sandstone and Slate
- Stop penetrating damp with our 100% breathable brick and stone sealer
- Lasts up to 10 years
- Reduce thermal loss by up to 30%
- Reduces condensation and black mould
- Rated 5 Star's
Extreme Climate ONE COAT Water Seal stops penetrating damp using the latest fluorocarbon technology. This helps to create simply the best performing (100% breathable) brick and stone sealer available today. With a lifespan of up to 10 years and no surface darkening, this water seal for brickwork halts rainwater absorption offering truly exceptional hydrophobic or bead up water repellency. Kingfisher Approved contractors can offer a 10-year re-pointing guarantee, incorporating Extreme Climate, Kingfisher pointing mortar and pointing solution.
This water seal for brickwork prevents damaging moisture ingress which causes masonry to spall in the freeze/thaw cycle. It inhibits moss growth by robbing it of water and nutrients drawn from the damp mortar. Using this brick sealer to dry out a damp wall can also reduce thermal loss by up to 30%. This is because a wet wall is a cold wall and "bleeds" heat to the atmosphere at an accelerated rate.
Brick Water Repellent
Drying out with Extreme Climate has even more benefits. It reduces the problem of condensation and black mould which develop on the indoor side of exterior walls when rain saturation cools the wall temperature such that warm moist indoor air condenses on the cold surface. On a related issue, if you have problems with efflorescence or salting, the unsightly, white staining we see on so many new build walls. Then Extreme Climate Water Seal can help by limiting the moisture absorption/evaporation cycle which leaves mineral salts deposited on the surface. Please call us for detailed advice on treating efflorescence.
Extreme Climate Water Seal also helps to keep buildings clean by forming an effective barrier against airborne dirt and other contaminants, which would otherwise be dissolved by rainwater and leach into the substrate where they inevitably stain the surface.
Finally, if you have previously applied cheaper masonry sealant products which may have worked for a year or less. Then this product is for you. Save hundreds or even thousands of pounds on remedial re-pointing, re-plastering and re-decoration by treating your external walls, facades and gables with Extreme Climate. The ultimate water seal for your masonry in extreme weather. Extreme Climate Water Seal can help by limiting the moisture absorption/evaporation cycle which leaves mineral salts deposited on the surface.
Our wealth of experience supplying masonry sealant products ensures we supply only the highest quality. For more information regarding how our brick sealer can help you, don’t hesitate to contact us.
In general it is very important that the surface to be treated is dry and masonry joints are sound, free from cracks and that all organic growth and accumulated contaminants are removed before application. As with all surface treatments you should apply to a small test area to check for compatibility before proceeding to full application. It is the user’s responsibility to establish suitability for the task in hand. Note: “Extreme Climate” can also be used in some instances to protect interior stone finishes but is best applied during construction/ re-fit phase when residual odour is less of an issue than in occupied premises.
Remove all loose moss, mould and dirt by wire brushing the affected areas. If there is any old cement residue on the brick faces you may also wish to clean these with Kingfisher brick acid “Descaler” which should then be rinsed thoroughly with cold water. Where the wall is contaminated with white efflorescence (salts) you should clean these with Kingfisher “Eco Brick Cleaner”.
Sanitise with Kingfisher "Biocidal Wash"
Having cleaned the wall down and removed all visible traces of organic growth you should spray the entire surface with Kingfisher “Biocidal Wash”. This effective fungicidal wall solution is designed specifically to neutralise moss and mould root systems/ spores so that they do not re-grow.
Your cleaned and biocide treated wall is now ready for re-pointing and any other necessary repairs. The re-pointing is extremely important as rain water ingress through defective pointing is one of the most common causes of penetrating dampness. Rake out all loose mortar so that you work back to a sound substrate bed and re-point using Kingfisher "Pointing Solution" in your mortar mix to massively improve adhesion, strength and water resistance. Where an entire wall needs to be repointed we recommend using Kingfisher "Pointing Mortar" to help achieve uniform colour continuity.
Masking off and temporary precautions
"Extreme Climate" is a fluorocarbon dispersion in white spirit (flammable) and has an odour similar to white spirit. You should therefore take sensible precautions prior to application to exclude it form the indoor space including: close all windows, shut trickle vents, check mastic joints are in good condition and temporarily cover air brick vents and any other vents, cracks or apertures which might permit the passage of “Extreme Climate” into the building. You must exclude all sources of ignition e.g. Make sure that all warm external flues (e.g. for central heating boiler) are cool during application.
You should also mask off windows/doors to avoid contamination of glazed surfaces.
Apply "Extreme Climate"
"Extreme Climate" is supplied ready to use and can be applied to the substrate by low pressure spray* or brush. Only one coat is required unless the surface is exceptionally porous in which case allow at least 48 hours between coats. Note: “Extreme Climate” does not stick to itself, so do not be tempted to apply a second coat unless the primary coat is clearly not repelling moisture. You should take sensible precautions to guard against overspray or drips onto glass or proximate vehicle finishes. If applying by spray use a "solvent resistant"* pump sprayer or professional applicators can use a DPC pump with spray lance attachment. The wall should be completely dry for at least 24 hours prior to application and no rain should be expected for 24 hours post application. You should expect some residual odour for 24 to 48 hours post application but this is normally minimal if you follow the directions in section 4 above.
* See Kingfisher website for current solvent resistant sprayer range.
Flush your solvent resistant sprayer with clean "white spirit" and clean any brushes used with same. If "Extreme Climate" cures on glazed surfaces you will have to “skim” over the glass with a "window scraper" (from most DIY stores) but the key is to spray the glass liberally with glass cleaner first to lubricate the blade. You then polish it up with a soft cotton cloth. Note: this is standard technique as used by decorators to remove cured paint from windows.
How long does Extreme Climate Last?
It depends on the condition of your stonework or brickwork and prevailing wind direction but typically 5 to 10 years.
Will "Extreme Climate" leave a sheen finish or darken my stonework?
No, it is completely invisible when dried in. If in doubt, apply to a small discreet test area before proceeding to full application.
I have damp patches appearing on the internal plaster of an exposed outside wall, always following prolonged periods of heavy rain, what do you recommend to stop this?
Having eliminated the above you can reasonably conclude that the wall is absorbing water and therefore the bricks, mortar or even stonework must be porous in places. An application of one of our specialist water repellents such as "Extreme Climate" will stop this process by forcing the water to "bead up" on the surface and run off without penetrating.
What causes masonry to become porous?
Penetrating damp is normally (but not always) a gradual process which occurs when external walls have been exposed to the weather for many years. This typically leads to a "breaking down" of the masonry caused by moisture absorption. This is exacerbated by the winter freeze/thaw cycle which causes cracks, which then provide further pathways for water ingress, which also freeze causing......well I'm sure you get the picture! It can happen in bricks or various stone types including sand stone and most commonly in the mortar joints.
You seem to recommend the solvent based "Extreme CIimate" and "Superseal" products ahead of the water based "Storm seaI". Why is that?
Solvent-borne water repellents achieve deeper and more permanent substrate penetration and typically last 4 to 5 times longer than water based. Their only drawback is that they cannot be applied to a damp surface or if rain is expected within 3 hours of application.
My outside wall is suffering from penetrating damp but your "Extreme Climate" has to be applied to a dry surface in dry conditions which we are not getting in the current wet weather, what do you suggest?
In winter when some brick and stonework never seems to dry out "Storm Seal" can be used as a short term "fix". "Storm Seal" has to be applied to a damp surface to work effectively and it will quickly form an effective moisture barrier which should resolve the problem for at least 12 to 18 months.
I applied "Storm SeaI" last winter and now I want to put something on the wall which will last longer, is it alright to apply "Superseal" or "Extreme Climate" over the top of it?
Yes, "Superseal" and "Extreme Climate" are fully compatible with "Storm Seal" so you can apply them any time conditions permit.
My home is faced with limestone and suffers in places from penetrating damp. I have been told that water repellents can darken limestone, is this correct?
Yes, "Superseal" which is based on Polyoxo saluminium stearate chemistry would darken limestone so we always recommend our silicone (siloxane) water repellent as it does not affect the colour of limestone at all.
What is the difference between "Superseal" and "Extreme Climate"?
"Superseal" which is based on Polyoxo saluminium stearate chemistry was the industry standard for premium grade water seal for over a decade until "Extreme Climate" me out "Extreme Climate" uses the latest fluorocarbon chemistry which works at a molecular level to form an invisible film which uses water to "bead up" very tightly on most porous substrates. Superseal requires 2 x coats whereas EC needs only one coat so you use half as much and obviously save the labour cost of applying a second coat.
At our Village Hall we have a wall one metre high by 60m long it has slate slabs on top. At every slate joint moisture runs down the wall and a black mould or fungus grows. We plan to power wash it but seek a spray-able product to stop the discolouration or give longer time between cleaning treatments. Can you help?
We are always cautious about saying we can definitely offer a solution but I suspect the problem is that a particular mould or fungal growth has embedded itself in the surface substrate and merely washing it will not eradicate the problem. This is simply because microscopic spores and tiny portions of algal! fungal growth remain on the surface after the washing process and simply re-grow.
I used extreme climate on a property built of granite. We suffered damp patches internally I have to say the results are amazing and plan to use it again on other parts of the building.
Reviewed by Malcolm L. on
I purchased a sample of the Extreme Climate to test on my 1907 sandstone built house. The sandstone is prous and I'm getting water penetration around the chimney where the cavity is rubble-filled. On a lower part of the house, the solution seems to work well and so I'm intending to buy sufficient to treat both chimney stacks. I can't vouch for the longevity, of course, as yet. Ask me in 10 years time.
Reviewed by Mike J on