The speculation made initially by the early investigators citing the the probable cause as material failure was completely wrong.
After a thorough forensic investigation by the Dutch Safety Board, the actual fault was found and the origin of the fault that caused the collapse was due to an error made by the construction company.
The investigation discovered that load bearing floor panels had been installed with incorrect orientation. The panels were meant to be crossing the pillars laterally and instead they were positioned longitudinally across the support pillars, leading to catastrophic structural integrity failure.
Below is a quote from the official investigation.
Eindhoven Airport and construction company BAM reached an agreement on the financial settlement of the incident of 27 May 2017, in which the parking garage at Eindhoven Airport partially collapsed. Fortunately no casualties occurred during the incident.
At the beginning of April 2018 BAM started with the rebuilding of the parking garage. Completion is planned for October 2019. The parties do not make any further announcements regarding the content of the agreement reached.
“We are pleased that with this agreement we can put a stop to financial settlement and we can focus on the future”, says Joost Meijs, general manager of Eindhoven Airport.
“The settlement fits within the provision made by BAM in the fourth quarter of 2017,” says Jaap Hazeleger, director BAM Bouw en Techniek bv. “The rebuilding is progressing well.”Eindhoven / Bunnik, 2 January 2019