geïmpregneerde baksteen

Coated bricks for preventive protection

If you're going to build or renovate with bricks, then choose bricks by Vandersanden. These are the only bricks on the market that are protected against white spots and residue with a 25-year warranty against lime staining.

25-year guarantee against gypsum efflorescence

Gypsum efflorescence often starts as a light film which develops into a white-grey fog and can mar entire facades. We offer a 25-year guarantee against gypsum efflorescence, with the guarantee specifically applying to the white-grey haze that can appear on brickwork caused by gypsum efflorescence. This guarantee also applies to all our brick slips and facing bricks*. So, you can rest assured – your facade will remain beautiful for many years to come.

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*Non-impregnated facing bricks and brick slips with a production date before 01/01/2024 are not covered by this guarantee. Do you have any further questions? Please contact us.

25-year guarantee against gypsum efflorescence

How do we stop gypsum efflorescence?

Our wire-cut bricks are naturally resistant to gypsum efflorescence due to the closed structure of their surfaces. To protect our waterstruck and handmade bricks from these processes, we use special clays. The other types of bricks that are prone to efflorescence are coated. This makes the four visible sides of the facing brick or brick slip water repellent, so they retain their beautiful colour and appearance for a long time.

How does this gypsum efflorescence form?

When it rains a brick absorbs water into its pores. A brick also absorbs moisture from wet mortar. Minerals and small gypsum particles dissolve in the water and are transported through the brick pores. When the brick dries, water evaporates through the face of the brick with minerals and gypsum particles deposited on the surface.

The solution? Coated bricks

At Vandersanden, we have developed a process in which we treat facing bricks after the firing process with an environmentally friendly liquid. This makes the four visible sides of the bricks water repellent to a depth of about 5-15 mm. We do not coat the bedding surfaces (top and bottom) of the brick. This allows us to use the bricks in the traditional manner, using the existing mortars. Important note: The facing bricks remain vapour permeable.

Advantages of coated facing bricks

With coated bricks and other bricks that are protected against gypsum efflorescence, you can be sure that efflorescence will not occur and that your facade will also be better protected against efflorescence and other types of contamination. These bricks offer five key benefits:

  1. Your facade stays beautiful longer, and you have a 25-year guarantee* against gypsum efflorescence.
  2. A coated brick retains its original appearance in terms of colour, shape and structure.
  3. The pores of the bricks remain open, and frost-resistance is guaranteed. Moisture in the core of the brick can escape via the bedding surfaces and through evaporation along the coated visible sides.
  4. The coated visible sides absorbs considerably less water, reducing dirt build-up.
  5. You avoid the expense of having your facade cleaned. Removing the gypsum efflorescence that forms is a job for experts. After mechanical cleaning, your facade bricks can be re-coloured, which can lead to uncertainty about the result.

At Vandersanden, we have been coating all our facing bricks that are susceptible to gypsum efflorescence since 2020. Our other facing bricks have a more closed surface structure. That is why we offer a 25-year guarantee against efflorescence on our entire range.

*Non-impregnated facing bricks and brick slips with a production date before 01/01/2024 are not covered by this guarantee. Do you have any further questions? Please contact us.

Building with confidence

When you design or build a project (or have one built), you want it to look as beautiful in the long term as it does on the day it was completed. With Vandersanden's facing bricks, you prevent the gypsum efflorescence caused by efflorescence. Guaranteed for 25 years.

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Building with confidence

Get in touch with an expert

Vandersanden

Riemsterweg 300
BE-3740 Bilzen-Hoeselt (Spouwen)

+32 (0)89 51 01 40
[email protected]

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