This is a breathable rendering mortar, formulated with natural hydraulic lime, mixed with carefully selected aggregates, used as a finish coating in the renovation and rehabilitation of exteriors on old masonry.
This Natural Hydraulic Lime based NHL Finishing Mortar is a dry mortar, formulated with natural hydraulic lime, for the finish coating in a fine breathable layer, in the renovation and rehabilitation in exteriors on old masonry.
Its tixotropy, adhesion and permeability properties are particularly adapted for the use over old rendered substrates.
- Technical Documents
- Application Advice
Preparing the substrates
The subtrates must be clean of dust, sand, release agents, disaggregated or unstable
materials or paints. It is recommended, on old subtrates, to wash surfaces with pressurized water or brushing with a wire brush.
Preparing the mortar
The NHL Finishing Mortar must be mixed with the appopriate amount of water, in small quantities and using an electrical drill, in order to obtain a uniform paste without lumps.
After mixing the NHL Finishing Mortar, a smooth layer must be applied over the substrate. One or two layers of this mortar are enough to give the surface a smooth texture with a natural colour.
In the application process, the necessary cautions must be ensured, using the adequate techniques, in order to guarantee a continuous and uniform appearance, eliminating creases or other imperfections.
The total tickness of the coating should not be above 4 mm.
The NHL Finishing Mortar must not be applied at temperatures below 5 ºC and above 30 ºC. In dry weather or under exposure to strong winds, proceed with the watering of the executed surfaces for a week, in order to keep the mortar permanently moistened.