Seam
Seam turns up in 2 fields: concrete, building. Here is what it means to the people in each one.
Seam in concrete
A visible line or joint where two separate concrete placements meet.
A physical junction between two sections of concrete. In flatwork and pavements, it often refers to a longitudinal construction joint or a patched strip where a utility trench was filled. Because the new mix rarely matches the exact color and texture of the old concrete, the seam remains visible.
"The city patched the water main trench, but the seam is already starting to spall."
Seam in building
The line or joint where two pieces of building material meet and are fastened together.
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.
"Make sure you roll every seam on that TPO roof so we don't get any leaks."