Cavity Wall Insulation Blamed Again

The potential damp problems allegedly caused by cavity wall insulation continues to be very topical at the moment. With this in mind it may be worth relaying details of another defect we were were asked to investigate this week.

We were called to London to investigate an isolated patch of penetration  damp to a ground floor bedroom.  My client had been unable to resolve this problem and was somewhat mystified as to what was causing the problem.

Leaking downpipe

Leaking downpipe

On the surface, it appeared to be a straightforward case of penetrating damp and an external check to the rear of the property immediately confirmed a longstanding problem with gutter leakage that had saturated the rear wall to such an extent that a dark patch of moss and lichen growth could be seen behind the gutter down pipe, extending from floor to roof level. The roof was parapet walled with a lead box gutter outlet feeding into the RWDP hopper. A simple problem, easily diagnosed and fixed, with the internal penetrating damp easily explained if we were dealing with a solid wall.





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