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Reinforced autoclaved aerated concrete in roofing in schools
This document is for building owners to help them to identify the presence of reinforced autoclaved aerated concrete (RAAC) and to check whether any further investigation or action is needed.
10 February 2021
Third party content
Publisher: Department for Education
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
Channel slab roof deck collapse during reroofing
This report highlights the structural risk caused by machinery during reroof a project.
10 May 2021
CROSS Safety Report
Report ID: 970
Region: CROSS-US
Roof collapse of warehouse structure under rainwater ponding
This report highlights the structural risk caused by rainwater ponding on relatively flat roofs.
10 May 2021
CROSS Safety Report
Report ID: 969
Region: CROSS-US
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
Storm damage to pressed metal roof covering
A modern dwelling with two separate V-shaped roofs sustained damage to the standing seam pressed metal roof covering during two separate weather events.
23 February 2024
CROSS Safety Report
Report ID: 952
Region: CROSS-UK
Temporary movement joint in slabs not installed correctly
Dowels in temporary movement joints for a slab were not installed correctly, impacting the structural behaviour.
29 March 2021
CROSS Safety Report
Report ID: 998
Region: CROSS-UK
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
Painted faying surfaces leads to connections with insufficient load capacity
Painted, rather than the required unpainted connection faying surfaces, were identified by the Resident Engineer of a reporter's firm during the erection of a primary frame for a large project. The painted surfaces resulted in the connections not having sufficient load carrying capacity and necessitated remedial works.
20 November 2023
CROSS Safety Report
Report ID: 896
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
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