The most common types of roofing systems for commercial buildings are:
1. Built-up roofing (BUR)
2. Modified bitumen roofing
3. Single-ply roofing (such as EPDM, PVC or TPO)
4. Metal roofing
5. Spray foam roofing
6. Green roofing (vegetative or living roofs)
7. Asphalt shingle roofing (less common for large commercial buildings)
8. Clay or concrete tile roofing (less common for large commercial buildings)
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