IStructE: responding to the RAAC crisis

This month we present a report concerning the partial collapse of a cantilevered stone staircase without warning during a renovation at a stately home built around 1830.

Hugh Docherty looks at the topical subject of reinforced autoclaved aerated concrete (RAAC), offering brief guidance on identification and mitigation/remedial options.

Hugh Docherty introduces a new series of short advice notes that aims to educate structural engineers on historical defects commonly encountered when working on existing buildings.