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Learn more about Water Repellents

Penetrating Damp Treatment and Water Repellents

Penetrating damp is where water penetrates the building material (brick, stone, render, concrete etc) from the external side and is then absorbed into the building material. It then continues to travel through to the internal surfaces of the building where it can cause damage.

Damage Caused by Penetrating Damp

Penetrating damp often carries salts and other pollutants from the atmosphere into the facade of the building. This can cause:

  • Damage to timber elements, corrosion of wall ties and metal frame work
  • Efflorescence, bursting crystals of salt, cracks, spalling in masonry work
  • Loss of strength, sanding and detachment of renders
  • Growth of algae and lichen on your walls

Inadequate attention is also often paid to the fact that many building materials react to an increase in moisture content by losing strength. The damage associated with water and moisture are far more extensive and varied than the few major ones described here.

The physical properties of the building material – particularly thermal conductivity – also change, rising dramatically and reducing insulation, as the moisture content increases.

Because water has such good heat conductivity, a reduction in the moisture content of a material always increases the thermal insulation properties of the building substrate, improves the indoor environment and also saves valuable energy.

Treating Penetrating Damp

To protect your property from penetrating damp and reduce the risk of the associated problems caused we highly recommend penetrating damp treatment with one or a combination of our water repellents to all exposed external masonry surfaces. Penetrating damp treatment should only be applied to surfaces that are not coated with paints or other coatings that could affect the penetration of the penetrating damp treatment.

Penetrating damp treatments can be applied to most masonry substrates including brick, concrete, render, natural and reconstituted stone.

By applying an external water repellent not only will you stop penetrating damp, reduce the build up of dirt, algae and lichen, you will also reduce the heat lost through your walls. A dry brick conducts just 30% of the heat lost through a damp one. That’s why we would suggest penetrating damp treatment as a precaution to any property before the tell tale destructive symptoms become apparent.

Our water repellents do not affect the substrate appearance, and leave a waterproof surface but still allow the substrate to "breathe".

For help in selecting the right external water repellent for your penetrating damp treatment please feel free to contact us on 0117 982 3282, we’re here to help.

Find out more about waterproofing brick and masonry substrates in our guide.

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