The Snow Dam helps to prevent dangerous avalanches from snow or ice build-up on metal building roofs. The patented Snow Dam permits water from melted snow to run off roofs while safely retaining up to 2,000 pounds of un-melted snow and ice. It’s an aluminum guard that fastens to the standing seam (not to the flat portion of the roof panel) allowing panels to move with expansion and contraction. The Snow Dam has pre-punched holes for fastening to the standing seam. Tape mastic is used between the Snow Dam’s base and the standing seam to assure a watertight seal. Installation can be done at any time during the life of the roof. The Snow Dam is fabricated from .08-inch aluminum with all-welded construction for years of trouble-free service. Units are customizable to fit any standing-seam configuration and panel width and may be painted to match existing roof panel colors.