The rising water in the walls by capillarity are one of the scourges of the constructions of the last fifty years. The most commonly used economic base material, the breeze block, has proven to be a real sponge and facilitates this phenomenon by its porosity. But noble materials such as calcareous stones, can also be at the origin of the phenomenon if, at the time of their rise, no cut of capillarity has been realized as the rules of the art and the various DTU pertaining to the use of these materials.
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1. The realization of an insulating wall of a wall is obtained by incorporating in the mortar employed a concentrated adjuvant to be diluted in the mixing water to obtain a waterproof and water-repellent sole.
2. After having dosed the water-repellent product according to the manufacturer's recommendations (it exists in a dose for a bag of cement) and mixing it with the mixing water, proceed according to the rules of the art.
3. You can mechanically mix larger quantities of mortar. All you need to do is to dose the product according to the amount of materials and water required for the capacity of the concrete mixer used.
4. Although it is advisable to make this sealing sole 15 cm above the finished floor, it can be done at level or even under a floor of ground floor. This sole must have a minimum thickness of 2 cm to guarantee its function of cutting capillary rises
5. The external side protection of the foundations is also part of the systems to be used to prevent humidity from rising in the walls. It involves applying a bituminous waterproofing coating whose essential function will be to isolate by a double layer, the wall of the masonry that will be in contact with the backfill materials.
6. On the support intended to be buried and of which the overhanging or friable parts have been eliminated and the traces of oil, mud or dust cleaned, pass a first layer of this bituminous product with, either a strong brush, a trowel or trowel. Wait for the first application to dry completely (2 hours at 20°) to pass the second in a crossed layer.
(photos / visuals: © Parexlanko, except special mention)
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