It is common to see painted buildings where cracks in the render show through the paint work. Often the cracks in the paint correspond to the mortar joints in the blockwork behind the render. It is a concern for many homeowners that if they were to get the building repainted the cracks would quickly reappear, even if the cracks were filled. This is a justified concern because it is a likely outcome.
In our opinion the best solution if one is faced with painting a cracked wall is to use an extremely flexible, micro porous, anti-carbonation coating either with a flat or textured finish. When we are contracted to apply such a protective coating one of the first things we do is check for sources of damp that may affect the finished product – however well a masonry paint is applied, if the wall behind is damp then it is unlikely to stick. If damp is found then appropriate action is taken to remedy the situation. With a dry wall we removing all loose material before repairing any damaged areas and give all surfaces a thorough clean. All cracks are then repaired using flexible fillers and/or reinforcing mesh and a stabalising solution is then applied to all friable surfaces. The final paint finish is applied in two coats, which can be chosen from over 200 colours.
The finished product is elastic, waterproof, washable and beathable. It has an excellent resistance to ageing and contamination and protects reinforced concrete against carbonation and corrosion. On larger projects the paint manufacturers guarantee their product for 10 years even in aggressive environments (such as on coastal structures). This level of performance is far greater than the other mainstream products available on the market.
Also see: concrete repair, wall tie replacement, helical bar reinforcement, damp proofing and injection dpc;