Report 902 - Unauthorised structural alterations to accomodate drain pipes

On a recent project under construction, a reporter became aware of cases where main structural steel sections were “butchered” to accommodate plastic foul drainage runs. Flanges and webs were compromised significantly. This was a BIM project and the clashes should have been picked up, but much of the detailing was passed down the supply chain to sub-contractors who had no BIM capability, meaning that the co-ordination of some key elements was not properly carried out in advance of construction.