Slanded ceiling for lost space help

[ollycuff]

I have creating my loft conversion plans onto sweet home 3D. I am having issues trying to slant the ceiling or wall so I can see how much head room I will have.

parts of the ceiling are slated from 0 to 2100cm. please could someone help me to do this?

thanks

[VeroniQ]

Did you have a look to this article?

[Puybaret]

From the images Ollycuff posted on Facebook, I think he will be more interested by the house with dormers in the gallery.