Signs of cavity wall tie failure include:
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Horizontal Cracks: Found in the mortar, often at a high level, caused by the expansion of corroded wall ties on the external leaf.
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Bulging Brickwork: Indicates snapped wall ties, which can make your property unstable.
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Internal Cracking: Caused by the expansion of corroded wall ties.
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Cracks in the Render: Vertical cracks in the render.
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Roof Edges Lifting: The inner leaf carries the roof load, but as corroded wall ties expand and crack the mortar, the outer leaf takes the load, resulting in forcing the roof upwards or the gable ridge to rise.
If you observe any of these signs, it’s essential to consult a specialist for a comprehensive survey.