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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

Apparently simple home improvement work leads to dangerous situation

Apparently simple home improvement work, consisting of reroofing and a loft conversion, resulted in a 'near miss' with potentially dangerous conditions for neighbours.

21 August 2023

CROSS Safety Report

Report ID: 1173

Region: CROSS-UK

Overloading a portal frame with suspended services

A reporter designing a single storey portal frame used a standard roof service loading of 0.25kN/m2. After the project was completed, a tenant for the unit took over fit out and added a considerable amount of sprinkler pipework into the roof. This created local overloading.

21 August 2023

CROSS Safety Report

Report ID: 1195

Region: CROSS-UK

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...

25 May 2023

CROSS Safety Report

Report ID: 1227

Region: CROSS-UK

Structural misunderstanding leads to historic church tower nearly being demolished

A historic church stands at the center of a charming town. Highlighted among many striking features is the iconic 170-foot (52m) bell tower, which looms over the town. For decades, the tower has become the centerpiece for cultural events in addition to being the original community center of worship.

2 May 2023

CROSS Safety Report

Report ID: 1013

Region: CROSS-US

Partial collapse of a shopping mall roof under drifting snow

Partial collapse of a shopping mall roof under drifting snow caused by lack of building code provisions for drifting snow and poor fabrication of open web steel joists.

2 May 2023

CROSS Safety Report

Report ID: 1009

Region: 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

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