Salt contaminated substrates - restoration with THERMOPAL

Key Facts

1 Salt contaminated surface

Salts located within masonry work function hygroscopically and migrate to the surface, as this evaporation zone has a low moisture content and good conditions for crystallisation exists. This leads to the destruction of the plaster/render surface.

2 Application of the salt converter

Brush apply ESCO-FLUAT once or twice to the exposed masonry work to saturation (dependent on the salt contamination and porosity of the substrate). The damaging salts are converted to sparingly soluble salts and cannot be carried forward into the new,
freshly applied plaster.

3 Throwing the splatterdash coat

Apply THERMOPAL-SP, up to a maximum thickness of 5 mm, to cover half the surface (approx. 50% surface coverage) in preparation for the render coat in accordance with the rules governing rendering techniques. Lightly pre-wet the substrate as necessary in order to guarantee a good bond.

4 Application of the backing coat plaster

Apply THERMOPAL-GP11 in thicknesses from 10–30 mm (with thicker coats in more layers). Strike off each previous coat with a plasterer’s darby. Immediately the plaster stiffens roughen up horizontally and allow to dry.

5 Application of the restoration plaster

Apply a single layer of THERMOPAL-ULTRA up to a max. of 3 cm. After allowing to stand for an adequate amount of time, the surface can be grid floated or rubbed down. Rubbing too early encourages the binder to concentrate at the surface which can cause shrinkage cracks and impede the vapour permeability of the plaster layer.

6 Application of the fine plaster finish

Apply the fine grain mineral-based compound THERMOPAL-FS33 by trowel to the required thickness up to a max. of 3 mm. Once the surface has dried rub down with a foam rubber board, felt board or sponge board.