HIDROCLAY - hidrofugante, impermeabilizante fachadas

Hidroclay Monestir is a water-based water-repellent treatment developed to protect facades and absorbent mineral cladding from water penetration. It is particularly suitable for exposed brick, single-layer cladding, natural stone, and concrete, both indoors and outdoors.

Its purpose is to reduce the substrate’s water absorption while maintaining breathability. It penetrates the material without forming a conventional surface film, thereby preserving the facade’s original appearance and causing no noticeable change in its color or sheen.

Water repellency helps prevent moisture stains and the appearance of efflorescence caused by the movement and crystallization of salts within porous materials. It also inhibits the conditions that promote mold growth and the gradual darkening of facades exposed to moisture and air pollution.

Monestir also attributes a consolidating function to the treatment, which helps reduce premature aging and wear of the substrate. By reducing water penetration, it also helps limit degradation processes associated with freezing and spalling that can occur in certain porous mineral materials.

The substrate must be thoroughly clean and completely dry before beginning. Dirt, dust, moss, efflorescence, and residues from incompatible treatments must be removed. The effectiveness of a penetrating water repellent depends directly on the product’s ability to be absorbed by the material’s pores.

It can be applied with a wide brush, roller, or spray bottle. On facades, Monestir recommends applying a generous, even coat and working from the bottom up—a technique that helps control drips and ensures uniform penetration.

It is important not to oversaturate the surface. According to the manufacturer’s current instructions, Hidroclay does not allow for a second coat, so the first application must be evenly distributed.

The approximate coverage is 8 to 12 m² per liter, depending on the porosity of the brick, stone, concrete, or cladding. Highly absorbent surfaces will consume more product than compact surfaces.

The recommended application temperature ranges from 5 to 35 °C. The product dries to the touch very quickly, although Monestir indicates that it reaches full effectiveness in approximately 24 hours. Brushes, rollers, and tools should be cleaned with water immediately after use.

It is formulated as a complex emulsion of water-diluted resins. It does not form a film that can flake off and allows the substrate to remain breathable. It is colorless, not designed to provide shine or a wet look, and is specifically intended to preserve a natural visual finish.