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Waterproofing. the issue is when water gets into a crack, all concrete cracks, it s made to crack. water gets into a crack. in the north, you worry about it freezing and thawing, because when water freezes it expands and that makes the crack bigger. you also worry about [ audio difficulty ] then you can get rust in the reinforcing steel. when rust gets in the reinforcement steel, at first glance it might look like it s really severe, but remember, it s an expanded material. you take a wire brush and you brush off that rust and you might find you only lost a 16th of an inch of a half inch or 5/8 of an inch of a piece of rebar. allyn? zblm just seeing rusted reinforcing steel and just seeing cracks in spalls in limited areas doesn t mean that caused the collapse. ....
Precipitate the collapse. what you want to do is try to find the trigger. if you can hear me, allyn, you ve obviously seen the pictures in the miami herald from a pool contractor that showed cracks in the concrete, water on the ground there. you know about the 2018 report that was done by the engineer. does any of that raise red flags for you? you know, while some of those things i ve seen things like that in lots of buildings. the bottom line is you have this particular building, and a lot of buildings, you have the building tower and then the first floor and the basement stick out further than the tower in the plan, and that s where you have planters and driveways and stuff like that. you have waterproofing on those ....
Things like a bomb explosion [ awed audio difficulty ] things like that, a trigger kind of event. foundations moving around more than a certain amount. all those things are trigger events. sometimes buildings talk to you if you can listen to them, so what happens is it s possible that slabs in the building were deflecting for long periods of time. that means spinning downward and nobody knew anything about it or didn t understand it. all those things can eventually lead to a problem. there are other issues that participated in the collapse. what you want to do is try to find the trigger. if you can hear me, allyn, you ve obviously seen the pictures in the miami herald from a pool contractor that ....
This one thing, would it have still fallen down with the trigger event. you go through all the different combinations. when buildings we ve looked at were hit by planes or bombs or things like that, you know what the trigger event was. here you don t know what the trigger event is, and generally speaking, you can t get down to one particular cause unless you can prove that. that s what we ll be doing over a long period of time. sorry, allyn, there is a thunderstorm here, so your sound to me is going in and out. i didn t mean to interrupt you. you said you have as many as 30 different theories of what might have happened here. what are a few of them? you know, you go through looking for triggers, you know. this is just me thinking this, not any thought i have nothing that tells me that any of these were even possible, but you don t know, so you have to find out. ....
Of an inch or half-eighths of an inch of a piece of rebar. allyn? just seeing cracks in limited areas doesn t mean that caused the collapse. it it s a beginning. it will contribute, i understand. you re just beginning. allyn kilsheimer, i appreciate you joining us tonight talking about the investigation. you re just getting started. vast experience to bear. thank you. a mother came home just in time to save her two children s lives. this is such an amazing story of feeling something simply is not right and then acting on it. later the story emerging behind so many images it won t be forgotten. what we re learning about the woman who lives here and is unaccounted for tonight. ....