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CROSS regions
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
Concerns over corrosion of dissimilar metals in fixing cavity wall tie systems
A reporter is concerned about corrosion that may occur between dissimilar metals that can be used in cavity wall tie systems. The reporter has noted that stainless steel and carbon steel may be fixed together in wall cavities, which are damp environments, and that corrosion of dissimilar metals in contact may occur.
24 May 2023
CROSS Safety Report
Report ID: 1186
Region: CROSS-UK
Modern methods of construction and robustness
This report relates to the design of a low rise modular building and the requirement, or otherwise, for positive fixings between the superstructure and the substructure.
24 May 2023
CROSS Safety Report
Report ID: 1179
Region: CROSS-UK
Overall stability of building proposed to be provided by metal framing and plasterboard
Metal framing and plasterboard was used to provide lateral stability to a building. The form of construction was later deemed to be unsuitable and extensive remedial works had to be carried out.
24 May 2023
CROSS Safety Report
Report ID: 468
Region: CROSS-UK
Incorrectly installed tension control bolts could have led to serious consequences
A reporter finds incorrectly installed system HRC preload bolt assemblies, better known as tension control bolts, during a site inspection of a new highway bridge over a railway. The incorrectly fitted bolts could have had major structural implications, and led to other safety risks, if the installation error had not been spotted.
24 May 2023
CROSS Safety Report
Report ID: 1196
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
Missing fixing strap on Light Gauge Steel Framing System may affect fire performance
A reporter has become aware of several cases where a critical strap has not been installed within a Light Gauge Steel Frame external wall system.
26 August 2022
CROSS Safety Report
Report ID: 1141
Region: CROSS-UK
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
Stone cladding panel concerns
A reporter is concerned in respect of the risk of failure of stone cladding panels.
9 August 2022
CROSS Safety Report
Report ID: 1069
Region: CROSS-UK
Water ingress to cross-laminated timber structural frame
In an eight year old building that included cross-laminated timber construction, it was found that water penetration had caused parts of the structure to rot.
6 June 2022
CROSS Safety Report
Report ID: 1124
Region: CROSS-UK
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