To make a shed roof of your own you'll need to use a Roof and Magic cube tools.

  1. Create rooms of the house;
  2. Add two slanted roofs;
  3. Turn them using a round arrow icon; 
  4. Use a Magic cube to fill the space between the wall and a roof (that way you'll be increasing the height of the walls).

Check out our video tutorial about creating a custom slanted roof in a Web app. However, main controllers are the same on all apps, so you won't have any issues reproducing these steps.