• Moisture at the bottom of walls with MORTEX® coating ?

    1. Identify the cause
    Water insidiously infiltrates through a micro-crack, a hole or any other opening in the MORTEX® coating. This water infiltrates more or less slowly.

    It is drawn up by capillary action into the support, making it swell (e.g. plaster) and can create certain other disorders such as salts. The result is the detachment of the MORTEX® coating with its primer.

    In a wet room, the junction between the floor and the walls with the MORTEX® coating is very important.

    How can an impermeable connection be achieved with the MORTEX® product in the corners and recesses?

    Always execute the corners in the same operation, using the staircase method or a chamfer.

    If necessary, use a flexible MS polymer sealant. See FAQ “What type of flexible expansion seal can be used between MORTEX® coatings or between the MORTEX® coating and another material?”

    Never join fresh plaster to dry plaster to avoid the risk of creating micro-gaps that do not ensure the impermeability of the system and cause the above-mentioned problems.

    2. How to repair ?

    Remove all parts that are not adherent or deformed by humidity as well as all parts that do not allow for a technically waterproof and aesthetic repair.

    Allow to dry thoroughly.

    If necessary, repair the substrate.

    Let it dry for the necessary time depending on the repair products used.

    From a technical point of view, it is always advisable to repair the entire wall with MORTEX® plaster, even if partial repairs have already been successfully carried out.

    It is difficult to carry out very local repairs unless you are an expert or have a very elaborate MORTEX® coating, both in colour and structure.


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