Using shell tool to make custom roof.

[Paa]

Hello. 

I am trying to make this shape below using the shell tool. There are two different shells put together... I used the solid element operations listed in the second picture and trimmed the flat roof element to the arched roof piece.

Now when I make these cuts I am left with what looks like a composite and that green portion. I cant figure out how to change the color so that it matches the tile roofing; a smooth transition of the same material. I hope this makes sense, I am learning still. Thank you...

  

[Paa]

Hope someone is out there on a weekend!