CROSS Safety Report
Incorrect fabrication of balustrade connection
A reporter describes how threaded bars were incorrectly used for a balustrade fixing instead of bolts which led to failure of the connection.
Key Learning Outcomes
For the construction team:
- Any alterations to structural connections should be approved by the designer prior to works being carried out on site
- Quality control and competent supervision along with a well documented inspection regime on site can help to ensure that structural components are built in accordance with the design
- Consider introducing a quality control procedure for the inspection of safety critical elements being delivered to ensure they are the correct ones as specified on the construction drawings
Find out more about the Full Report
The Full Report below has been submitted to CROSS and describes the reporter’s experience. The text has been edited for clarity and to ensure anonymity and confidentiality by removing any identifiable details. If you would like to know more about our secure reporting process or submit a report yourself, please visit the reporting to CROSS-UK page.
To satisfy Local Building Control and replicate the existing aesthetics the balustrade post connection had a hidden detail, says a reporter. The detail consisted of an M12 bolt inside the post, with a non-structural weld to prevent the bolt from turning when tightening the nut.
During installation a bolt was being tightened when a weld cracked and a threaded bar, which was supposed to be a M12 bolt, was revealed. A selection of posts were then destructively tested by cutting the welded post off (Figure 1) and it was found that all posts had been fabricated using M12 threaded bar, instead of an M12 bolt specified in the design.
Submit a report
Your report will make a difference. It will help to create positive change and improve safety.
Our secure and confidential safety reporting system gives professionals the opportunity to share their experiences to help others.
No feedback has yet been published for this page.
Expert Panel Comments
Expert Panels comment on the reports we receive. They use their experience to help you understand what can be learned from the reports. If you would like to know more, please visit the CROSS-UK Expert Panels page.
There are no Expert Panel comments on this report. The Expert Panels are only asked to comment on selected reports. These are normally reports where there is an opportunity for them to help you understand what can be learned from the report.