Get Surface By Orientation : Sloped/Inclined Surfaces

Dear All,
I can’t get the inclined surface of this basin foundation (model in place).
As you can see in the snap, as horizontal up surfaces i am getting the quantities of only the red ones.The yellow one is not estimated since it is inclined.
How to get also inclined surface value? Any suggestion?
I need those values for accounting purpose.

See what’s in this discussion maybe:

If you wan’t non-vertical surface you could filter your surfaces by isVertical and use the false elements. That would give you everything except the vertical surfaces.