“Often, they serve to vent the attic space also known as a vented ridge,” Harper says. Ridge caps seal the very top of rooflines where two roof caps meet. The following instructions are general, non-comprehensive guidelines and recommendations regarding installation procedures for three common residential metal roofing trim components: ridge caps, eave trim and rake trim. “Architectural styles also dictate what sort of trim is required,” he adds. Ray Smith, managing director and owner of Jupiter, Fla.-based AppliCad USA Inc., says the style of trim used is determined by the edge being finished and the roofing material being used. So, what’s different about trim components installed on residential metal roofs versus trim components installed on nonresidential metal roofs? Ashley Harper, marketing analyst for MBCI, Houston, says trim on commercial roofs tends to be larger and more aesthetically pleasing than residential roofs. All of this moisture reduction reduces mold growth and decreases the risk of ceiling leaks. Eliminating moisture intrusion and diverting water away from a building, trim creates smooth and watertight transitions between different sections of the roof, which is critical in locations where the roof’s slope or direction changes. More importantly, this integral roof accessory provides critical protection in conjunction with metal roofing panels to strengthen and seal the entire roof. Metal roofing trim can give homes a finished, polished appearance with contrasting colors and interesting shapes.
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