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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

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

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

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

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

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

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

Timber design concerns

A reporter says what he has seen of the quality of the structural engineering design of roofs in many hundreds of projects is lamentably low.

1 March 2006

CROSS Safety Report

Report ID: 21

Region: CROSS-UK

Design of timber structures

An approximate design led to a timber roof deflecting considerably.

1 November 2005

CROSS Safety Report

Report ID: 17

Region: CROSS-UK

Failure of reinforced autoclaved aerated concrete (RAAC) planks

In late 2018, the Local Government Association (LGA) and the Department for Education (DfE) contacted all school building owners to draw attention to a recent failure involving a flat roof There was little warning of the sudden collapse.

1 May 2019

CROSS Safety Alert

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

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