It can be much less, if water gets in and corrodes the rebar. https://www.npr.org/2021/08/26/1031245430/surfside-condo-collapse-corrosion https://www.npr.org/2

It can be much less, if water gets in and corrodes the rebar. https://www.npr.org/2021/08/26/1031245430/surfside-condo-collapse-corrosion https://www.npr.org/2021/08/26/1031245430/surfside-condo-col...