Converting meshes to face (need advice)

Hello Sketch up community,

I’m working on a college project where I use Skellion software to place solar panels on roof.
I also got a mesh .obj file from my professor that i imported using extensions.
However skellion needs plain face surface and I got a uneven roof mesh.
How could I turn roof mesh to a plain face?

Extract the perimeter of the house and the height of the roof from the 3D model


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