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How is a reactive protective system for brickwork made?

Indoor brickwork is not normally subject to harsh climatic or mechanical agents. When making a protective coating therefore, the main factors to be taken into account are aesthetic effect and adhesion, plus ease of production and integration with technology and equipment are also essential considerations.
There are a number of phases to the treatment
  • preparing the surface
  • intermediate adhesion treatment
  • fire-protection treatment
  • finishing treatment
Preparing the surface and intermediate adhesion treatment. 
The wall surfaces to be prepared can be of different types and in different states of preservation, with each situation requiring different preparation.
The first operation is to make a careful inspection of the structure and the area to be protected from fire. It is necessary to verify the general state of the structure, its solidity, the presence of any contaminants, the emission of water vapour, chemical attack, etc. and above all to check the degree of moisture within the structure which must be within the prescribed parameters for the type of wall. The way the surface is prepared will vary according to the type of surface to be treated.
  • A new surface must be checked for the presence of any contaminating agents and for the solidity of the plasterwork. Any impurities should be carefully cleaned off and if the new surface is dusty a product that promotes adhesion must be used. Amonn offers Amotherm Brick Primer WB, a single-component acrylic fixative and we still recommend its use if the surface appears to be in excellent condition.
  • If the surface is old, account must be taken of any previous paint residues, any alterations to and contaminating agents on the surface. It is necessary to remove any layers that are not perfectly anchored and to check their compatibility with the reactive system. For a better result, we recommend always trying to remove old layers of paint and to use a suitable fixative. Amonn offers Amotherm Brick Primer WB.
  • When applying the coating to a wall that has not been plastered, the surface should be checked for contaminating agents. Any impurities must be carefully cleaned off, after which a fixative should be applied. Amonn offers Amotherm Brick Primer WB, a single-component acrylic fixative.
Fire-protection treatment.
Once the surface has been completely prepared, the fire-proofing treatment can be applied using a spray, paintbrush or roller. It is essential that reactive/intumescent systems must only be applied to a properly prepared, compatible surface. We advise against applying the protective coating in unfavourable environmental conditions and to read the technical information provided by the manufacturer very carefully. The thickness of paint to be applied in order to achieve the required protection is obtained by applying multiple coats, ensuring the correct amount of time has elapsed between coats. The thickness achieved during application can be checked using a wet film micrometer or, once it has dried, using a digital ultrasonic micrometer. Be particularly careful when measuring the thickness because the instrument is unable to distinguish between old and new paint and therefore the reading may be incorrect. If this is the case, take a digital measurement before and after the treatment and subtract the thickness of the pre-existing layers away from the new measurement.

Finishing treatment.

If the treatment is applied in unfavourable environmental conditions, in internal environments where there is damp and the occasional presence of water or in semi-exposed areas such as sheds, a specific protective finishing treatment should be used. This can also be used merely for aesthetic effect if a coloured finish is wanted. Amonn recommends Amotherm Brick Top WB, a protective water-based topcoat that protects the intumescent treatment from harsh environmental agents and makes the film resistant to condensation, damp and water.
We would remind you that intumescent paints for brickwork cannot be used outdoors or where there is a likelihood of prolonged contact with water or where there may be rising damp, as in for example, insufficiently damp-proofed basement walls
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