What a wall tie is and how it can fail?
In most of the cases people assume that the actual wall tie is broken when they hear about wall tie failure but it is actually the corrosion of the protective coating of the wall tie and not the actual wall tie breaking.
Why change your wall ties?
Rusting happens on the metal wall ties and this causes the ties to abnormally expand up to 7 times the original thickness. The original size of the tie is approximately 4 mm but because of the rusting it can expand up to 28mm.
Horizontal cracks appear because of the pressure created by the expansion of the ties. In extreme cases the damaged walls may also collapse.
Best time to change wall ties?
The replacement of the wall ties should happen between the stages 2 or 3 of the damage, as shown in the above picture. This is to ensure that the rusted ties are not enough harmful to cause some permanent damage to the structure.
The property in the picture above had to have sections of walling rebuilt as structural damage had occurred.
Rocksure Damp Proofing wall tie treatment
Holes made for installation and isolation are filled in using coloured mortars.