Question about Analysis mesh setup for Diva

Hi, 

I just modeled a very simple room in Grasshopper and I'm trying do some daylight analysis using diva, I moved the floor surface up in the +Z direction , then I created a mesh out of the new moved surface. I have two questions

1- did I set up the mesh the correct way and did I setup the colored mesh right (to import the results from Diva)

2- the mesh Normals seems to be in the -Z ? why is that? when I plug the mesh normals in the DIVA component I get different results from simulations using the default normals (+z)