Properties built before 1981 were fitted with galvanised steel wall ties. These were prone to corrosion which caused the outward movement of brick or block work which can develop into more serious structural defects. You can locate and isolate the corroded ties and fit a stainless steel mechanical replacement wall tie. These works are all carried out from the outside of the property so there is no internal disruption. All replacement wall tie work is normally guaranteed for 30 years.