If the ceiling is already there click anywhere on the ceiling to get a pop up to remove the ceiling.
How to roof a house in sims 4.
Add a half hipped roof along one edge.
Best built on square or rectangular buildings start with a room on the roof level two or three squares in from the edge.
Build a smaller room on the roof about one or two squares from the edge of the building line up a half hipped roof against the wall and adjust the length and height.
Copy this roof and use it for the other edges of the building adjusting the length as needed.
Repeat on all four edges.
If there is no ceiling and you want to build one click anywhere on the yellow border to get the pop up to build the ceiling.
Then move in the overhang and lower the peak of the roof so that it is as flat as possible.
Adjust it to be flush against the wall of the room and pull it up to the same height.
Find a roof pattern that matches the qualities of your main wall pattern.
Choose the foundation pattern that balances out the home vertically by matching the roof.
Here are a few tips to help you graduate beyond just making a box with windows.
I achieved this by starting with a simple symmetrical shape a 6 9 rectangle and adding a equally basic gabled roof across the entire structure.
Finally add the rectangular paneled glass roof texture to the roof and you have your basic greenhouse.
Next add a gabled roof with the peak of the roof going along the 6 square length.
Add the square roof trim and make it green.
Although it requires a little bit of experimentation and manipulation we now have the ability to create a something that at the very least resembles a skylight in the sims 4.