RonaBond Crack Bridging Anti-Carbonation Coating WB is a façade coating formulated on a water based acryl-siloxane. It is used as a waterproof decorative coating and can be applied to most traditional building surfaces after suitable preparation. The addition of siloxane improves shedding of pollutants from the surface and resistance to migration residues from the substrate. The addition of glass micro-spheres improves application properties and vapour transmission.

RonaBond Crack Bridging Anti-Carbonation Coating WB is a high build elastomeric, waterproof and carbonation resistant coating. It protects facades against water ingress while allowing improved diffusion of normal levels of moisture vapour from the background provided by inclusion of glass micro- spheres in the formulation. The micro-spheres also provide improved application characteristics. When applied to reinforced concrete it provides excellent protection against corrosion of reinforcement.

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• Features & Benefits
• Case Studies
• Systems
• Colours
• Limitations
• Preparation
• Surface Levelling and Repair Prior To Application
• Priming
• Cracks
• Application

Features & Benefits

• High build anti-carbonation coating; excellent CO2 resistance
• Excellent self-cleaning properties
• Matt finish
• Elastomeric & waterproof façade coating
• Available in white - colours available on request
• Dynamic crack accommodation up to 2mm
• Water based
• Excellent application properties
• Prime normal porosity backgrounds with diluted coating, less wastage

Case Studies

Sussex Heights

Built in 1965, this housing project was originally clad in mosaic tiles which, come 1990, were removed due to deterioration of the surface. RonaBond Crack Bridging Anti-Carbonation Coating WB was chosen to protect the reinforced concrete structure against attack by airborne salts and acidic CO2 gases and provide a rainproof envelope.

In 2001 the coating was renewed, enabling continual cover and a 10-year extension to its warranty period.

Loughborough Estate

Billed as Europe’s Largest Concrete Repair Project in 1993, home to 239 families in the London Borough of Lambeth. 31,000 litres of RonaBond Crack Bridging Anti-Carbonation Coating WB was used to mask and protect concrete repairs and soffits, providing a 10 year Insurance Backed Guarantee.

Systems

Colours

Some RAL and BS colours can also be produced, consult Rawlins technical on 0113 2455450 (option 2) or send a message to [email protected] for further information.

A light reflectance value of 35 or greater should be chosen for façade coatings.

Limitations

Do not apply below 5℃ or above 35℃.

Do not apply on soffitts or below DPC level or to structures containing high levels of moisture; in these locations use RonaBond Anti Carbonation Coating WB. RonaBond Crack Bridging Anti- Carbonation Coating WB can be applied on to previously painted surfaces provided the paint is sound, well bonded and the correct primer has been chosen.

Site trials are advised including cross hatch and sponge testing.

It is important to note that coverage rates are based on flat, non-porous surfaces, make no allowance for wastage and are the minimum that should be allowed for.

Additional material will be required on surfaces which are either uneven or porous.

Drying times are based on 20°C and 65% RH. Drying will vary at different temperatures and RH. It is important to note that coverage rates are based on flat, non-porous surfaces, make no allowance for wastage and are the minimum that should be allowed for. Additional material will be required on surfaces which are either uneven or porous.

Preparation

Prepare the substrate by suitable means (e.g. blasting, high pressure water/grit, scraping, chemical removal) to provide a sound and stable and clean surface; surfaces may be damp but not wet with running water or condensation. Treat surfaces contaminated with moss, algae, fungal growth, etc with RonaBond Fungicidal Treatment.

Surface Levelling and Repair Prior To Application

The application of RonaBond Crack Bridging Anti-Carbonation Coating WB (and other paints/coatings) will highlight and exaggerate surface imperfections and undulations. Uneven surfaces may be levelled with RonaBond Easy Skim FC.

Priming

Prime surface with RonaBond Crack Bridging Anti-Carbonation Coating WB diluted with 10% clean water at a rate of 6-7m² per litre. For high suction backgrounds contact  Rawlins technical on 0113 2455450 (option 2) or send a message to [email protected].

Cracks

Fill fine cracks with RonaBond Stop Crack using a pallette knife as appropriate, application should be repeated until the dry crack filler has fully filled the crack.

Application

Apply one or more coats of RonaBond Crack Bridging Anti-Carbonation Coating WB (system dependent) to achieve the specified film thickness and/or dynamic crack accommodation requirement. Apply by RonaBond long-haired roller or airless spray.

A mottled surface texture is a good indicator of adequate spread rate but regular use of a wet film gauge is recommended to ensure the correct coverage.

When applying RonaBond Crack Bridging Anti-Carbonation Coating WB 20, RonaBond Crack-bridging Fabric should be pasted into the fresh second layer of RonaBond RonaBond Crack Bridging Anti-Carbonation Coating WB, care should be taken to eliminate bubbles and folds in the fabric.

RonaBond Crack Bridging Anti-Carbonation Coating WB can be applied using airless spray. The nozzle size shall be 625-629. Included within the spray should be a 60 mesh filter. Dilution of the coating can be made with water between 2-10%.

RonaBond Crack Bridging Anti-Carbonation Coating WB can be used on woodwork and steel when the appropriate primers are used. Refer to Rawlins Technical Department.