There are several types of roofing systems used in commercial buildings, including:
1. Built-up roofing (BUR)
2. Modified bitumen roofing
3. Single-ply roofing
4. Metal roofing
5. Spray foam roofing
6. Green roofing
7. Asphalt shingle roofing
8. Concrete roofing
9. Clay tile roofing
10. Slate roofing.
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