Elevation does not sound right, You might say 'upward expansion' but that's not great. It would be better if you could reword the whole sentence. eg The collapse of the elementary school in *** was the result of the addition of a third floor to the building using reinforced concrete which, during the seismic wave, shattered the ordinary masonry underneath, causing the whole building to come cr a shing down
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Henry74Can you please suggest a better wording?I don't think Clive's version can be improved upon. If I were you, I'd use that one.