After you have the diagram, construct the product on the assembly station.
The Chimney Roof (Diagram) is given when accepting said mission on Commission Board during the mission South Block Development.
Alternatively, the diagram can be bought from the Research Center Exchange for 16 .
The Chimney Roof (Diagram) can be used to learn how to make Chimney Roofs.
3 Hardened Clay
1 Large Iron Bucket
2 Aluminum Plate
2 Large Pipe