Applying weatherproofing masonry brick sealer to your walls

DryFix Water Repellent Masonry Cream

Applying weatherproofing masonry brick sealer to your walls is a job to start thinking about and doing from Spring through to Autumn.

The value to carrying out this process is to protect mortar, brick-face, stone and render against wind driven rain, especially to south westerly facing elevations which overtime, if left exposed and unprotected, breakdown allowing for rain water ingress.

Rain water ingress leads to ongoing frost damage which further breaks down the face of the walls as well as potentially creating an internal damp issue to plaster and decorated finishes.

The application of a sealer to walls, roof tiles, paving, etc should only be carried out when the surfaces to be treated have been cleaned and prepared thoroughly and are free of dirt, moss, algae, lichen, grease and oil. Externally painted surfaces cannot be treated with a sealer as simply it will not penetrate through the paint.

Where algae is present we recommend using a good algae chemical remover as can be found in our surface treatment product category: 

Any holes in the brick or poor condition mortar should be made good. Re-pointing to be carried out if necessary and the mortar allowed to cure before any treatment is applied.

An algae remover takes 3 – 5 days to do its work and strips away the algae growth so a sealer should not be applied until this has been done.

The weather conditions play a part in applying a masonry sealer. Ideally it should be dry and not too windy if you propose to spray the sealer. Rain should not be forecasted  for at least 48 hours preferably longer. Walls can be damp but not wet.

The choice of weatherproofing masonry brick sealer is driven by the job at hand in so much as solid walls to properties in exposed locations would benefit from cream based products such as our DryFix brand:

Cream based masonry sealer’s penetrate further into the surface making the application more durable, longer lasting and improve thermal efficiency.

Surfaces that are not so exposed and to properties in sheltered areas would be fine with our good quality N-virol Waterseal:

Coverage rates are a guide only. Especially porous brick and mortar will soak up any chemical that much quicker requiring possibly a second application. For cream versions we recommend applying with a brush to maximise the coverage rate.

For any advice and to place orders call 01329 235252


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