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Cavity walls date back to approximately the turn of the century but specific types of cavity wall construction date back to far earlier periods in history. Cavity walls consist of two separate walls "tied" together using some form of "cavity wall tie" . Old metal wall ties commonly came in the form of a strip of metal with a black bitumen or zinc coating. Over the years it has become apparent that these ties were insufficiently treated. Owing to this the ties start to corrode. Deterioration of cavity wall ties is a widespread problem to walls throughout the UK , particularly in exposed areas or in walls of particular construction and with specific mortar types. The corrosion of cavity wall ties can lead to horizontal and stepped cracking to brickwork, bulging of brickwork and in more severe cases the external leaf of brickwork has been known to collapse.
The installation of new stainless steel wall ties is vital where corrosion or insufficient numbers of existing ties has been noted.
We have extensive experience in both inspecting the condition of the existing cavity wall ties and the undertaking of remedial works where necessary.
| Typical signs of Cavity Wall Tie Corrosion |
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