A cavity wall tie survey is an inspection process that evaluates the condition of the metal ties connecting the inner and outer leaves of a cavity wall. The survey aims to identify any signs of corrosion, failure, or inadequacy in the wall ties, which are crucial for maintaining the structural integrity of the wall. The procedure typically involves:
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An external appraisal of the building to identify construction details, the presence of a cavity, insulation, and any visible cracks or defects.
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Using a metal detector to locate wall ties.
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Drilling small inspection holes near the ties and employing a borescope to visually assess their condition.
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Photographing the ties for further analysis and record-keeping.
This process is straightforward and usually takes less than an hour.