My surveyor thinks my house suffers from wall tie corrosion. Does this means replacing all the ties ?
Not necessarily, this can only be determined after a specialist survey to examine the true condition of the ties on each elevation. This will involve use of an endoscope and the physical removal of sample ties.
The condition of the ties may vary from elevation to elevation particularly in exposed locations.
If the installation of remedial wall ties is recommended, the old ties are usually isolated to avoid any further corrosion but left in place because their removal would be costly, time consuming and difficult to achieve without necessitating wholesale repointing of the masonry.