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Cleaning and maintaining brick, stone and block walls

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Cleaning and maintaining brick, stone and block walls


The method for the removal of moss, algae or lichen from walls very much depends upon the the type of brick or stone, age and general condition of the wall/property

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With all types of construction, the removal of moss, algae, lichen or just greening is most important, not just for the appearance of the wall but to maintain its structural strength and lifespan. Brick, stone and block walls are porous and uneven surfaces provide the perfect surface for the moss, algae, lichen to happily grow. feeding off the good old uk weather.

However and Unfortunately, this growth will, over a period of time, cause damage to the wall by loosening mortar and brickwork, all of which will eventually result in costly repairs. stone work as well will suffer at rotting mortar.

A vast majority of this damage can be avoided by following some simple steps and undertaking a small amount of general maintenance:

 

Preparation

we like to teach that The surface should be brushed firmly or wired brushed depending on the surface. this will remove any loose growth, dirt and dust including loose masonry. The surface should then be inspected for damaged areas such as loose mortar, damaged bricks or loose stones and any remedial works that must undertaken. this means don't rush it! this process is about doing it correct and looking out for any future potential issues.


So, for example If your wall or house is covered by trees, shrubs or plants, it may help to cut these back slightly to allow more light onto the surface, as this will allow the area to dry more quickly; dampness will always encourage fresh growth of moss in a situation like this example. so preparation is important.

 

Treatment

Once the surface has been brushed. you can use a proper stone or brick surface cleaner to help you remove dirt and staining as well as atmospheric staining from industry or traffic. These are generally sprayed on to the surface, then left to act/go to work before being rinsed. This rinsing can be with water and a brush, a hosepipe or with a pressure washer.


we use hot power washers reaching 150 Degrees pushing out 103 bar, which is about 1500 ps. we also use a high powered cold wash which is around a strong out put of 250 bar 3600 ps. both have great advantages when adding pressure. it will depend on the clients requests. normally we tend to clean the surface with the 250 bar machine anyway.


if you are thinking what's the difference of results of hot and cold!? imagine washing your dishes. the tougher the grime you have on your plates or pots, the more hot water into your basin letting it sit for a 10 15 minutes. hot water will slightly soften the surface if possible cut through the grime/scale.


Now, Once the treated area is dry, we advise the application of a neutral surface cleaner..(Brick acid on sandstone or softer stone. Don't use)

Following the instructions on your Neutral surface stone or brick cleaner and if a ratio of part water part chemical is needed, follow what you need to do. and don't for get remember your PPE, for safety reasons.


The solution can be applied using a brush for smaller flatter areas or a spray bottle. solutions can be added into your power wash if you are doing a DIY. again always make sure you read the instructions and follow then. seek professional help when using any solutions that is strong.


as a helping point! it is wrong and bad practice to add or apply a water sealant without following the above prepping. especially if your surface is needing remedial works.

it normally takes 10 to 15 minutes is a rough time to leave the solution on the surface, before washing it off.


we like to apply a breatheable water sealant onto the surface, after carrying our cleaning works . This will help provide a long term protection to the area for up to 10 years, as well as protecting against water ingress (which will reduce the effect of frost on both the bricks and mortar) and against dirt and general weathering.



BEFORE
BEFORE

AFTER
AFTER


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