well, we have to blame SH3D. it is so wonderfully intuitive that with bare manual browsing and internet browsing, I managed to design a full house. that's a compliment, of course.
Kudo's that you managed to get this far without any reading of the basics! Of course most new users START with reading the basics before trying to design a complete house 
the link between roofs and room wasn't clear to me. my barn (carport) now will have an imaginary room. :-)
You only need the room once to generate the roof. When you have generated the roof you can delete the room or move it to a separate level that you make invisible as a backup. When you want to change the roof you can select the roof and start the Roof Generator again, it will read the values into the plugin so you can change the existing values. No need for the room anymore.----------------------------------------
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