Social street housing

An estate of terraced and semi-detached social street housing of cavity construction, with corroded mild steel cavity wall ties – wall tie treatment

case study 56e19a2e79c0d8.46786177 - Social street housing

The subject buildings form an estate of terraced and semi-detached social street housing of cavity construction under pitched roofs.


The existing wall ties viewed were found to be mild steel vertical twist ties, commonly known as fishtail ties. The galvanised coating was found to be in varying stages of corrosion, blackened with red rusting noted.

case 11 a 1 - Social street housing

The corrosion of the embedded mild steel wall ties had resulted in the formation of ferrous oxide, which had expanded to many times its original thickness lifting and cracking the brickwork.

An archetypical example of a wall with the symptoms of expansive corroding wall ties lifting the bricks cracking the bed joint horizontally that has simply been re-pointed. This action has only temporarily addressed the symptoms and NOT the causation.

case 11 b - Social street housing


AWT completed a remedial programme providing a comprehensive repair through the introduction of a pattern of remedial wall ties and isolating the existing ties, together with general brickwork repairs and re-pointing.

Action Wall Ties (AWT) are specialists in masonry reinforcement and repair, providing professional solutions to a wide variety of structural problems in London Surrey and Kent. Contact us on 01227 721 255, or email us.

Call us if your building has any of these

Common Structural Defects, Issues or Problems

Our specialist structural repair contractors will be happy to help provide a comprehensive and permanent repair to your structural problems.

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