some genius decided to continue building up before adding sheathing the the bottom exterior levels. sheathing prevents shear or racking (lateral forces). american homes are built ok as long as you have competent contractors, but the structure is built as a system. take away a key component of the system and this happens. the place was probably rickety and unsafe already before the storm. people working on the top floor could probably feel the entire place moving. the entire video reeks of incompetence.
United States