The heat-welding process arrived in North America in the late 1980s, a technique developed to ensure seam integrity, produce an aseptic-free seam and ride the move from felt-backed to vinyl-backed materials. In my travels looking at commercial resilient concerns, I am constantly encountering failures with the heat-weld process. After looking at many of these failures I have developed, in no particular order, a list of THE MOST COMMON.