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 occur as a result of spalling concrete. spalling refers to the surface of concrete breaking or peeling away. it s sometimes indicative of a deeper more structural issue. you know that rebar is that goes inside concrete? if there s a little space and humidity they start to rust,
anything like this occur as a result of spalling concrete. spalling refers to the surface of concrete breaking or peeling away. it s sometimes indicative of a deeper more structural issue. you know that rebar is that goes inside concrete? if there s a little space and humidity they start to rust, especially adjacent to saltwater, the ocean. as that happens, they will expand and they can actually push concrete and other building materials out as that happens and you will see cracks. that s a possibility. it s not that unusual in a seaside building to have some degree of corrosion. but for it to collapse on itself, we need more perspective. we have a structural engineer who is familiar with this building. his name is greg batista and he joins me now. thank you for doing this on short notice. good evening. what we re hearing, i heard
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