Modeling a Stepped Footing

[IanVG]

Hello all, I've got another Revit modeling question as regards a structural footing. A note in the drawing (from 1968) specifies that:

"The maximum wall footing ste-off shall be 2'-0" vertical spaced not less than 4'-0" o.c. Footing step-offs are indicated on plans by the symbol S-strikethrough"

The drawing shows this:

Does the s-strikethrough represent the beginning or the middle of the footing step-off? My assumption is that it's the beginning. I have a sketch of a section of footing step-off's:

I'm also a bit confused as to what "4'-0" o.c." off-center with regards to what exactly? Thanks in advance for the help!

 

[BulbTheBuilder]

Typically, stepped footing have a "haunch". More of a right-angle triangle portion.

 

[driftLimiter]

I think your got it right in your sketch. Generally I use(see) the s-strike representing the actual location of the step starting.
2'0" max makes a lot of sense.

additionally unless the s-strikes are dimensioned you give the contractor some leeway but he is constrained by the 4'0" min oc
i.e. the actual as-built steps may not be exactly where they are shown in plan.

I also agree with Bulb, but for revit modeling I generally just model them the way you have sketched for simplicity.