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Structural safety of reinforced autoclaved aerated concrete (RAAC) planks

A Theme Page to raise awareness of and encourage knowledge sharing on the structural safety of RAAC planks.

CROSS Theme Page

Region: CROSS-UK, CROSS-AUS, CROSS-US

Failure of cantilevered stone staircase

During the renovation and change-of-use conversion of a former minor stately home built around 1830, under pedestrian loading, a ‘cantilevered’ stone staircase partially collapsed without warning.

21 February 2023

CROSS Safety Report

Report ID: 1147

Region: CROSS-UK

Glued on stainless steel panels fall

A ceiling in a retail setting was designed to be faced with reflective finish panels. The contractor proposed stainless steel bonded to MDF with folded edges and concealed mechanical restraint. The designer overruled the contractor and selected an adhesive-only solution which was implemented. Some months later, several panels failed, with some stainless steel facings falling to the floor.

20 February 2023

CROSS Safety Report

Report ID: 1187

Region: CROSS-UK

Wrong length blind bolts lead to unsafe bridge structure

Bridge strengthening being carried out using blind bolts left a structure in an unsafe condition with traffic loading on it.

20 February 2023

CROSS Safety Report

Report ID: 1185

Region: CROSS-UK

RAAC planks in a 1970s shopping centre

An existing large shopping centre built circa 1975 had a number of external storerooms and loading bays with roofs constructed using reinforced autoclaved aerated concrete (RAAC) planks. The planks had deflected to the extent that they needed replacing.

20 February 2023

CROSS Safety Report

Report ID: 1155

Region: CROSS-UK

Construction period of RAAC planks

A reporter says that there are structural issues with reinforced autoclaved aerated concrete (RAAC) panels installed in a building as late as 1998. This date is significantly later than previous reports suggest as the last significant use of RAAC elements in the UK.

20 February 2023

CROSS Safety Report

Report ID: 954

Region: CROSS-UK

The potential for expertise asymmetry in aspects of the design of tall buildings in the UK

A reporter is concerned about the potential for 'expertise asymmetry' in the fire safety domain, with a focus on smoke control systems.

20 February 2023

CROSS Safety Report

Report ID: 1143

Region: CROSS-UK

Further example of incorrect finite element modelling

Concerns in respect of the sufficiency of finite element modelling of masonry walls as part of a reinforced concrete framed building.

20 February 2023

CROSS Safety Report

Report ID: 1145

Region: CROSS-UK

Cladding failure in strong winds

A reporter writes with concerns about a repeat failure of building cladding, in severe but not exceptional winds, that saw panels fall to the public street below.

17 February 2023

CROSS Safety Report

Report ID: 1172

Region: CROSS-UK

Junction of partitioning walls and ceilings

A potential issue has been raised with CROSS, regarding the order of works in partitioning assemblies and how these can affect the performance of compartmentation.

17 February 2023

CROSS Safety Report

Report ID: 1156

Region: CROSS-UK

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