
Modified Bitumen Roof vs TPO Roofing: Commercial Roofing Breakdown
Two of the most common commercial flat roof systems found in the Northeast are modified bitumen and thermoplastic polyolefin (TPO). Modified bitumen roofing has been around since the 1970s when it was developed to address ongoing issues with traditional asphalt roofs, while TPO roofs began rising to popularity in the 1990s. TPO roofing performs well in extremely hot and bitterly