How many valleys are there at all roof areas?

• A. 5 Valleys
• B. 7 Valleys
• C. 6 Valleys
• D. 8 Valleys

Answer: (B)

Valleys are the lines where two roof planes meet and water flows along them. To find the total across all roof areas, identify every continuous valley line and count each distinct line once. Don’t double-count where valleys intersect or bend, since that’s still one valley path.

In the given diagram, tracing all such valley lines across all roof sections shows seven distinct valley lines. That’s why seven valleys is the correct total. If you counted only five or six, you’d be missing some valleys; counting eight would mean double-counting a valley segment where two sections meet and form one continuous line.