Watch this tutorial to find out how to make a basic roof in google sketchup the easy to use 3d modelling tool.
How to make corrugated roof in sketchup.
Click on the path roof surface to select then click on the follow me tool and then click on the profile triangle roof piece.
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This will create the roof over the structure to include the eaves.
How to make tile roof in sketchup without using plugins duration.
If you did it right you will see some funky structures on your roof.
Easily creates roofs with various parameters in sketchup plugin name.