Roof drainage system investigation

This impressive Grade 1 Listed property in Central London was originally built by the architect Robert Adam in the 1770s for the Duke of Wellington and is known as ‘No 1 London’. Historically it had been subject to major extension and alteration works. Historic England were concerned as the building’s roof drainage had always been vulnerable to blockage by fallen leaves and there were increasing signs of water ingress throughout the building as a result. H+R were instructed to investigate the roof system for geometry, construction, function, condition and vulnerability.

Work undertaken

H+R carried out various investigations into the roof drainage using a Flexi-Scope fibre-optic camera and found that there were two particular locations which were vulnerable to blockage and overflow that had been overlooked hitherto. H+R also accurately measured the roof geometry as the roof drainage was particularly convoluted and vulnerable. The resulting information will now form a vital part of the new planned maintenance programme.

How we solved the problem

After a full physical investigation of the roof drainage system a detailed condition schedule was produced with immediate necessary works highlighted. Floor plans plotting the path of internal drainpipes including one unexpectedly passing through a hidden room were drawn up. Drainage maintenance checklists were produced along with colour coded plans stating the drainage layout.

Roof drainage system investigation

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