Dijkman: "The construction of no building is checked annually. Fire safety is examined annually. Partly as a result of these fire safety investigations, the municipality says it was convinced that the stadium was" absolutely safe ".
"The building manager obviously has a different role," says the deputy mayor. He will certainly have to keep track of the maintenance of the stadium. You will have to paint once in a while, that is the responsibility of AZ. "
How a building must be maintained is stated in the inspection and maintenance regulations. "Many buildings have maintenance programs, but usually not the entire steel structure or all the bolts are passed by," says Brittijn van Ballast Nedam.
The installation of 1,700 solar panels on the roof of the stadium in 2016 did not lead to a new inspection of the roof construction. According to the municipality, there is no permit or inspection required for installing solar panels. The question is whether those panels make a big difference. "It will be one-third to one-fifth of the load that the roof must be able to handle. So I am not doing it that much," says Rob Nijsse, professor of civil engineering at TU Delft.
"But," he says: "As a client you have to make sure that people can sit safely under the roof. You can't just put something down on a roof. Actually you would be any construction, certainly one that sits above the heads of so many people, regularly inspect well. "
"Too little control"
Looking at photos of the collapsed roof of the AZ stadium, Nijsse says: "Of course I am not 100 percent sure, but I do not think that there has been a good check on this construction since 2006, because of ease and cost." And that does not only apply to the AZ stadium: "In the Netherlands, unfortunately, you see that buildings are under-controlled."
With or without solar panels: as usual in the Netherlands, inspections of the roof construction of the stadium in Alkmaar probably did not take place in recent years. When asked whether that should perhaps change in buildings where thousands of people come, the municipality of Alkmaar does not want to anticipate. "I think that is more a national discussion. We will first have the collapse investigated," the deputy mayor says.