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What is Penetrating Damp?

Rain penetration through masonry (known as penetrating damp) is a common problem in buildings – particularly in the case of those of solid wall construction. The problem is also common in buildings of cavity wall construction where cavity wall insulation has been poorly installed or used in walls that are not suitable for cavity wall insulation. Other paths through which rain can cross through a cavity wall include incorrectly positioned wall ties and mortar obstructions in the cavity.

Damp rooms usually have a distinctive and easily recognisable smell. Stale trapped air caused by poor ventilation is another good indicator. Damp patches and patches of mould can be due to water leakage and or water penetration – look for any corresponding defects (leaking gutters, pipes, roof tiles etc) at or near the locations of the mould.

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