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Cavity wall tie corrosion is the term used when the cavity wall ties bedded in a property with a cavity wall construction corrode due to the breakdown of their protective coating.
Wall tie corrosion can seriously damage external walls and could, in some cases, make a building unstable.
According to BRE research out of nine million dwellings constructed with cavity walls, two million suffer wall tie corrosion or failure and are in need of specialist remedial wall tie replacement. Often the problem is found to be exacerbated by insufficient ties having been installed during construction.
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Horizontal Cracks - in the mortar, usually at high level caused by expansion of wall ties
Bulging brickwork - caused by snapped wall ties which have corroded, this can make your property unstable
Inadequate protection - prior to the 1930s ties were not galvanised
Substandard galvanising - the British Standard for weight of galvanising was actually reduced between 1964 and 1981
Chemical action - for instance where corrosive black ash mortar has been used
Drilling holes in brickwork for access to wall ties (using the appropriate access equipment where needed)
Installation of new stainless steel wall ties
Isolation if necessary of existing wall ties to prevent further damage
Preserving the appearance of your property - make drilled holes good to match the existing wall appearance