Node to find touching elements

[jazzsharma200]

All I need is the exposed face of the beam whose some area of the face is touching the floor.

Exposed Face of the Beam Dynamo

I want the Exposed Face marked as Green in the ScreenShot Using Dynamo. Can we get this exposed face in dynamo? [Exposed Beam face] Quick Update [Screenshot 2021-09-15 150727] [Screenshot 2021-09-15 150743] I just want the face of beam which is below the floor.