RonaBond Anti-Carbonation Coating WB is a smooth creamy water based acrylic coating.

It is used as a protective and decorative coating for new, maintenance and refurbishment work and can be applied to most traditional building surfaces including concrete, repair mortar, render and masonry after preparation.

It provides a weather resistant surface which resists the ingress of CO2 and allows the substrate to “breathe”, When applying RonaBond Crack Bridging Anti-Carbonation Coating WB to facades, RonaBond Anti-Carbonation Coating WB should be used for soffits and below DPC level, to reduce the risk of blistering associated with elastomeric coatings applied to substrates containing high levels of moisture. The semi-thick nature of RonaBond Anti-Carbonation Coating WB provides high opacity.

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• Features & Benefits
• Case Studies
• Test Data
• Limitations
• Surface Levelling Prior To Application
• Application

Features & Benefits

• Excellent CO2 resistance
• High resistance to UV degradation
• Excellent vapour permeability
• Permanent flexibility
• Water based—environmentally friendly
• Smooth finish—low dirt retention
• Suitable for facades and soffits
• Large standard colour range

Case Studies

Addenbrooke’s Hospital

Concrete repairs to the nurses' accomodation high-rise block at Grantchester House, restoring facades.

Test Data

Carbon Dioxide Diffusion Resistance

• R (equivalent air layer thickness)* - 209m
• Sc (equivalent thickness of concrete) - 0.52m
• DFT (dry film thickness) of sample - 162 microns

Moisture Vapour Transmission

• Vapour permeability - 110g/m²/day
• SD (equivalent air layer thickness)** - 1.1m

*Klopfer criterion for effective anti-carbonation coating is R greater than 50 metres

**The criterion for an acceptable anti-carbonation coating is for SD to be equal to, or less than 4m

Tests by Taywood Engineering Ltd

Test Certificate No. 2867

Limitations

Do not apply below 5°C or above 35°C. Do not apply where live crack accommodation is required; use RonaBond Crack Bridging Anti-Carbonation Coating.

RonaBond Anti-Carbonation Coating WB can be applied to previously painted surfaces provided paint is sound and well bonded. Site trials are advised including cross hatch and sponge testing.

Surface Levelling Prior To Application

The application of RonaBond Anti-Carbonation Coating WB (and other paints/ coatings) will highlight surface imperfections and undulations. Surface levelling and smoothing with RonaBond Easy Skim FC should be considered.

Application

1. Prepare substrate by suitable means (e.g. grit blasting, high pressure water jetting, scraping or chemical removal) to provide a sound, stable and clean surface
2. Treat surfaces with RonaBond Fungicidal Treatment as necessary to eliminate surface contamination, moss, algae, fungal growth, etc
3. Repair defective surfaces with a suitable Ronacrete repair mortar
4. Apply the first coat of undiluted RonaBond Anti-Carbonation Coating WB at 8-10m² per litre, coverage may be reduced on textured substrates. Highly absorbent substrates may require dilution of the first coat with up to 10% clean water
5. Apply using the RonaBond long haired woollen roller or airless spray. Allow to dry
6. Apply the final coat of undiluted RonaBond Anti-Carbonation Coating WB at 8-10m² per litre and allow to dry, coverage may be reduced on textured substrates

RonaBond Anti-Carbonation Coating WB can be used on woodwork and steel when the appropriate primers are used. Refer to Rawlins Technical on 0113 2455450 (option 2) or send a message to [email protected].