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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

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

Snow drift implications due to building extension

Part of a roof collapsed in a factory and warehouse facility shortly after a storm event due to snow drift loads.

13 December 2022

CROSS Safety Report

Report ID: 947

Region: CROSS-UK

Condition assessments of exposed lightweight canopy roofs

Defects in lightweight canopy roofs, using underslung roofing sheets in many cases.

14 October 2022

CROSS Safety Report

Report ID: 1084

Region: CROSS-AUS

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.

26 August 2022

CROSS Safety Report

Report ID: 1125

Region: CROSS-UK

Roof collapse at a social club

This is a report about a roof collapse that occurred, in about 1985, because only half as many parallel faced timber roof trusses were installed as there should have been.

30 June 2022

CROSS Safety Report

Report ID: 942

Region: CROSS-UK

IStructE publishes investigation and assessment of RAAC panels

The IStructE has published guidance that provides identification and remediation solutions for Reinforced Autoclaved Aerated Concrete (RAAC) planks.

15 March 2022

Third party content

Publisher: The Institution of Structural Engineers

Structural failure of older timber connections

A reporter shares three examples of the structural failure or inadequacies of connections in existing timber structures that they have encountered.

13 December 2021

CROSS Safety Report

Report ID: 1040

Region: CROSS-UK

Safety issues when adding PV panels to existing roofs

A reporter raises concerns over the lack of structural engineering knowledge and dangerous assumptions, that they have seen, in assessments for the installation of photovoltaic (PV) panels for a number of buildings.

13 December 2021

CROSS Safety Report

Report ID: 1015

Region: CROSS-UK

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