Structural Safety Information and Reports

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Collapse of unusual hybrid concrete and steel strand truss on school roof

This report concerns the collapse of a school hall roof which resulted from the failure of one of a number of unusual hybrid concrete and steel strand trusses. The trusses consist of a precast reinforced concrete top chord and verticals with a bottom chord of tensioned steel strands. The failure of the truss resulted in the collapse of the supported flat roof local to the failed truss, and da...

Defects found in precast (prefabricated) concrete façades

The reporter found several issues when inspecting or reviewing buildings with precast concrete façades, particularly on older buildings, due to a lack of attention to durability and poor workmanship.

Temporary instability of columns

Concerns were raised by a reporter on the temporary stability of concrete columns during construction.

Incorrect lifting system used for precast concrete stair elements

A reporter was asked to inspect a precast concrete stair unit which was exhibiting cracking around the lifting anchor locations after being de-moulded.

Reinforced aerated autoclaved concrete planks found on pitched roof of 1990s hospital building

A building constructed in the early 1990s has been found to contain reinforced aerated autoclaved concrete (RAAC) planks. This date is important since it is much later than the previously thought last significant use of RAAC in buildings in the UK and potentially affects the scope of buildings that could require screening for RAAC problems.

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Collapse of unusual hybrid concrete and steel strand truss on school roof

Defects found in precast (prefabricated) concrete façades

Temporary instability of columns

Incorrect lifting system used for precast concrete stair elements

Reinforced aerated autoclaved concrete planks found on pitched roof of 1990s hospital building

Precast concrete panel fixing

Failure of prestressed hollowcore units during storage and transport

Failure of cast-in wire lifting loops on manhole cover slabs

Channel slab roof deck collapse during reroofing

Roof collapse of warehouse structure under rainwater ponding

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