The definition in the manual for the Cover to CGS is "the distance from the top of the slab to the bottom of the top bar". This will be the bottom of TOP bar or TOPTOP bar? What I've found is that, this value greatly affects the result of punching shear. It could go from an over-designed column to very much under-designed column by just changing this distance from bottom of TOP bar to TOPTOP bar.
Thank you very much!