Add Thickness to Mesh Surface

I just created this geometry in Grasshopper, and I am trying to add a thickness to it:

Background information:
I want to look like this concrete structure (we call them hyperbolic paraboloid umbrellas):

Thanks in advance.

Umbrella (22.8 KB)

Sasquatch plugin has a feature…(Offset Brep)

Umbrella (13.9 KB)

Thanks a lot! I am trying to keep it as mesh, so is there a way to keep it as a mesh without converting it into brep at all? (I am new to GH, and for my project, I found mesh to work better for me).

You could try with weaverbird plugin…

Umbrella (17.2 KB)

Thanks a lot! this is exactly what I was looking for.