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Project 3: Roofing Solutions- Solar & Green
Transcript of Project 3: Roofing Solutions- Solar & Green
Roofing Introduction There are an estimated 11 million square feet of PV modules installed on rooftops in the U.S. today, approximately 60% of which are installed on sloped roofs, and the remainder on flat roofs. PV modules can be installed on flat or sloped roofs as shown in the accompanying photos.
For flat roofs, the three securement options are rack-mounted, ballasted, or adhesive-mounted PV systems. With rack-mounted and ballasted options, sloped or flat modules may be used, depending on the desired power density. Sloped modules have a higher output per module, but require more space. Since flat-mounted modules do not shade each other, more power per square foot of roofing is achieved. Blocking: is the addition of lumber under a roof surface and between trusses or rafters as supplemental structural support.
Spanning: is the addition of lumber under a roof surface and across trusses or rafters as supplemental structural support.
Lag Screws: most mount brackets can be fastened into roof rafter directly from the exterior surface. lag screws are the most common fasteners for attaching array mounts to rouf tops since many roofs do not have access to the underside for other mounting methods.