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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

Incorrectly fixed sheets blow off parapet

This report concerns aluminium coping sheets that blew off the parapet of a block of flats under construction. The reporter says a fierce wind blew off several sheets which fell to the ground about 9m below. A building and a car were damaged but thankfully no one was hurt, although the potential for personal injury or death was significant.

25 May 2023

CROSS Safety Report

Report ID: 1180

Region: CROSS-UK

Incompetent design of simple steel beams

This report concerns designs for simple steel beams submitted to building control bodies under Part A of the Building Regulations. The reporter, a checking engineer for a building control body, was not able to accept the effective length and restraints assumed in a number of submitted designs. Most originated from individuals who used proprietary structural design computer packages without, i...

24 May 2023

CROSS Safety Report

Report ID: 1183

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

Supporting constructions under fire doors and screens

A reporter raised the issue of interpreting test results for understanding the performance of system glazing fire doors and screens in raised access floors or lightweight construction methods.

24 May 2023

CROSS Safety Report

Report ID: 1181

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

Fire safety concerns for partially occupied Higher Risk Residential Buildings

Fire authority checks found several safety failings in partially occupied Higher Risk Residential Buildings.

24 May 2023

CROSS Safety Report

Report ID: 1169

Region: CROSS-UK

Design criteria for firefighting lifts

A reporter is of the opinion that the design criteria for firefighting lifts should be re-evaluated.

24 May 2023

CROSS Safety Report

Report ID: 1182

Region: CROSS-UK

Battery Energy Storage System concerns

A reporter informed CROSS about issues that emerged, and had to be resolved, in the design and management of Battery Energy Storage Systems.

24 May 2023

CROSS Safety Report

Report ID: 1166

Region: CROSS-UK

Concern about rebending starter bars

This report concerns the bending and rebending of starter bars on site during the construction of a multi storey tower. The reporter considered that such a practice could compromise the structure under extreme load conditions.

24 May 2023

CROSS Safety Report

Report ID: 1164

Region: CROSS-UK

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