- Reach level 19, open the Technology menu and unlock Stone Structure Set for 3 Technology points.
- Collect what you need:
- Open the Build menu (B on PC), go to the Foundations tab, then Stone, and pick Stone Slanted Corner Roof (Inverted). Place it inside your base.
Stone Slanted Corner Roof (Inverted)
An inverted slanted triangular roof built on top of walls to keep out the rain and wind.
Made from stone, it is reasonably sturdy.