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Certification. is a review of the roof, hvac system, electrical, plumbing. but certainly, if there was nothing hazardous outline understand that report. anything that would have proven to be a danger to -- to life. and the engineer outlined what the priorities were. and the priority was the roof replacement, which was underway. >> now, i understand the logic that, if the board knew that there was something this serious, why would they have stayed in there? i accept that point. but when we hear about the work on the roof and that it was going on for a long time. this talk about spalling. do eit...

Concerned are you about the stability of the sister tower right nearby, built almost exactly at the same time by the same construction company? and a lot of authorities are now recommending that building should be completely evacuated out of an abundance of caution. >> i'm sorry, can you repeat that? >> how concerned are you about the sister tower that was built right around the same time, by the same builders, and the recommendation now by some authorities that out of an abundance of caution, that sister tower should be evacuated? >> well, i mean, evacuation, it would be a major decision to b...

Typically, chris, that's spalling. >> so, spalling is where rebar, which are the bars inside of cement, attach to moisture and rust and it creates outward pressure that will crack the outer layers of concrete. create a structural issue or not. >> yeah. let me give you an example of that. typically, with a -- with a building like this, you have got balconies and people over the years have put things on those balconies whether it's artificial turf or hard flooring. that tends to trap moisture that deteriorates the concrete surface underneath. once that surface gets degraded, it can affect the re...

Survey report that raised serious, very alarming concerns about the structural damage went unaddressed, structural damage over at the building. part of the report reads as follows: abundant cracking of various degrees was observed in the concrete columns, beams, and walls. though some of this damage is minor, most of the concrete deterioration needs to be repaired in a timely fashion. spalling is a term that refers to concrete that has cracked or crumbled. the consultant added an estimate was provided to make the necessary repairs. troy is a structural engineer, thank you very much for joining...

Out, each pull has ramifications that have a chain effect. so that's the now. the future question is how did this happen? what caused it? would it have been preventible? these are answerable. one man whose mother and grandmother are among the 99 missing tells cnn his mother told him she heard creeking noises a day before the building collapsed. asked about it, an attorney for the condo residence association says this. >> it doesn't shock me because buildings creak and make noise. i've been at this 40 years. no matter how bad the concrete has gotten, no one has ever seen anything like this occu...