Wall Tie Corrosion

The deterioration of the galvanised steel wall ties connecting the inner and outer leaves of a cavity wall, typically in houses built between the 1930s and 1980s. As ties corrode they expand, pushing the mortar joints apart and causing horizontal cracking in the outer brick leaf. The standard repair is to install new stainless steel remedial ties through the outer leaf at the correct centres and, if necessary, to cut out and re-point the affected bed joints.