Replies

"That’s why I wonder had they start to work on the roof structure, did something wrong, and...."

According to the mayor, "roof work" is done "all the time" (see below). Since this is a large building with lots of unit, this is likely maintenance type work.

According to one of the attorneys for the building's association, no "construction" had begun, they were still in the review process with the engineer (see #187 above).

"Speaking to the media on Thursday, [Surfside Mayor Charles] Burkett said he would jog by the building often and noticed roof work was underway.
The 7Investigates Team can confirm that.
We found a Notice of Commencement dated April 5 of this year to re-roof the building.
“There was roof work being done, but there is roof work being done all the time, and it’s hard to imagine that could have been the impetus for such a catastrophic collapse,” said Burkett."
Besides that, we could only find a commencement for AC replacement in 2019 and another commencement for elevator work back in 2017.
...
Peter Dyga, with the Associated Builders and Contractors Florida East Coast Chapter, said for a building failure of this magnitude, it’s likely multiple factors were involved.
“We’re going to have to go back to the design of this building, to the foundation, to the structure, to the engineering calculations, to the building, to the craftsmanship, to the maintenance, to the HOA records,” said Dyga. “Everything about it is a potential contributor, and it’s, unfortunately, going to be a very long time before we know the answers.”
...
We have since searched through code violation records and have not found any active code violations for the building.
There was one earlier this year for a violation of minimum fire standards, but that violation was already corrected.

https://wsvn.com/news/local/questions-arise-as-to-what-caused-partial-building-collapse-at-champlain-towers-in-surfside/ (Miami)

So, based on those two...we would assume authoritative accounts (i.e. not a casual passer by person)...it would appear that whatever "roof work" was being done was routine and that whatever "construction" that may have been done as part of their 40 year building recertification effort (and potentially structural/electrical/more substantial than "routine" maintenance) had not yet begun.