Open-frame metal buildings with batt insulation are the most common, but create most waterproofing and installation challenges during the initial installation. “Conventional structures with a steel deck with rigid installation under the metal roof provide the best results. “Site forming with the correct panel and clip can allow single runs to 300 feet,” he says. “From a budget and aesthetic standpoint, flat built-up roofing (BUR) -to-metal retrofits are prime candidates for low-slope metal roofing.”Ĭharlie Smith, national recover manager at McElroy Metal, Bossier City, La., claims the best low-slope installations are on square-shaped buildings with no hips or valleys, with dimensions that allow for single-run panel lengths with no step downs. “Buildings with low-slope metal roofs tend to be more concerned with system performance than the aesthetic benefit that a more visual roofline could promote,” Resso says. Frank Resso, PE, president, Resso Engineering, Newnan, Ga., agrees, saying that (generally) low-slope metal roofs tend to be used on buildings that are larger in overall area with long runs from eave to ridge, to reduce the total height of the roof and to minimize the structural requirements of the supporting framing. Jim Bush, vice president of sales at ATAS International, Allentown, Pa., believes large buildings with long-slope runs often are best applications for low-slope roofs as the overall height of the building can be minimized with low-slope systems. Typically, large-footprint, single-story warehouses and pre-engineered metal buildings will utilize low-slope metal roof systems. Minimum metal roof slope depends on the roof profile, building design, climate and site location. Low-slope roofs are not totally flat, their roof slope generally ranges from 1/4:12 to 3:12. Low-slope metal roofs require less material, which reduces the overall load on the building’s structure.
#Metal roof attachment method install
Low-slope metal roofs have simple geometries, and are easier and less expensive to install that medium-to steep-slope roofs.