The junction created when two separate panels, sheets, or rolls of material overlap or abut. In roofing and cladding, seams are critical weak points for water intrusion and must be sealed using heat welding, adhesives, or mechanical folding. The integrity of a seam determines the overall weather resistance of metal roofs, membrane roofs, and vapor barriers.
Heard on the job
Make sure you roll every seam on that TPO roof so we don't get any leaks.