Cavity Wall Tie Failure.
The failure of wall ties has become a significant problem in recent years. The main cause of failures is the rusting of metal ties, although there can be other causes, such as failure to properly bed the tie in the mortar joint, poor quality mortar reducing the bond between tie and mortar, or not installing the requisite number of ties. Cavity walls were constructed using metal ‘ties’ straps known as fishtail…