Renovation of brick or concrete facades and walls with RD-Elastoflex: A high-performance, waterproofing, and breathable coating.

Environmental conditions (general requirements):

• Minimum air and substrate temperatures: 10°C / 50°F for 24 hours.

• Maximum surface temperature: 55°C / 130°F.

• Maximum relative humidity: 80%.

• Surface temperature must be at least 3°C / 5°F above dew point.

• No threat of rain for 3 hours.

/!\ Notes

• There must be no condensation on the surface during application and drying. Caution when working at the beginning or end of the season!

• Overnight drying between coats is generally recommended. However, drying rates for water-based coatings depend on temperature, humidity and wind.

• From 15°C / 59°F, working conditions are comfortable and enable higher productivity. 

• If the project is located in a very hot area with very intense sunshine during the day, avoid applying the system when the sun is most intense on the surface, and prefer to work early in the morning, late in the afternoon or in the shade.

Direct environment

Check for the possible presence of chimneys or ventilation outlets that may expel contaminants onto the surface to be treated. Neutralize their effects during the work.

Surface preparation

The surface must always be clean, dry, degreased, and free from any contaminants. Old paint layers with poor adhesion must be removed.

1. Biocide / anti-moss treatment

This should be considered in case of the presence of moss, lichens, and other biological growths. Remove thoroughly down to the roots with a certified biocide product available on the market.

It is also possible to use diluted bleach. This provides a curative but not preventive action. Be careful with stains!

2. Removal of efflorescence

Efflorescence is a white deposit that appears on the surface of construction materials, such as concrete or brick. Efflorescence is mainly an aesthetic issue, but it can also indicate excessive moisture presence, which could damage the material in the long term.

2.1. Dry brushing: Use a stiff-bristle brush to dry brush off the salt deposits. This removes most of the efflorescence without using water, which is important because water can dissolve the salts and cause them to re-enter the material.

2.2. Water cleaning: If dry brushing is not sufficient, you can use water and a brush to clean the surface. However, avoid using too much water.

2.3. Use of an acid cleaner: If the efflorescence is stubborn, a mild acid cleaner, such as diluted muriatic acid or a specific product for efflorescence, can be used. Apply carefully, following the manufacturer's instructions, and rinse thoroughly with water. Be cautious, as acid can damage certain materials and should be handled with care.

3. New masonry

New masonry should be brushed beforehand with a wire brush to remove any remaining mortar. The laitance must be removed.

4. Existing paint and blisters

Check the adhesion of the existing paint. Remove any paint that no longer adheres properly using a scraper.

Pierce and cut the blisters and remove any loose paint.

Never paint over a poorly adhering coating!

5. High-pressure cleaning at a maximum of 120 bar / 1700 psi

6. Repair cracks and repoint where necessary.

Cracks > 3 mm can be filled with RD-Cement Filler.

Cracks > 0.3 mm and < 3 mm can be filled with RD-Acryl W acrylic sealant or MS Polymer.