review of a building’s energy consumption will show how much energy can be saved. Prior to installation, the correct permits and a plan check can fi nalize an installation plan that includes the number of panels, positioning and the overall PV design. “Prior to any solar installation, we will deter-
mine the roof type, age, warranties remaining, manufacturer and condition,” says Kate Riedo, solar development manager at Tecta America Co., Rose- mont, Ill. “We recommend that solar be installed on roofs with at least 15 years of life remaining. If necessary, Tecta will do repairs/replacements to bring the roof up to 15 years. [We] always follow the original roof manufacturer’s guidelines for installing
solar PV and fi le the necessary warranty continua- tion paperwork on the customers’ behalf.” The roof should be walked and a report pre-
pared showing any defi ciencies such as cracks, open seams, ponding water or punctures. “This is especially true if the roof is older than 10 years,” says Monique Hanis, spokesperson at SEIA. “Prior to installation, open seams should be sealed and any damage repaired in areas within the solar footprint to maintain the roof’s integrity. Inspect the roof for sags and other abnormalities.” A sag or deep depression may indicate a structural weakness in the support system that may require correction.
“Tecta hires an outside structural engineer to
evaluate the roof and determine the excess load capacity,” Riedo says. “Prior to any work on the site, Tecta will develop a site specifi c safety plan and set up appropriate safety measures including safety fl ags, OSHA-approved cable systems and/ or guard rails. Tecta also designates a staging area(s) on the roof, keeping safety and weight considerations in mind.”
Load limitations
A structural analysis must be performed on a metal roof to ensure its load limitations will not be exceeded. Crystalline solar modules weigh about
? PV installation and preparation is easier for large, fl at, unadorned roof areas. (Image courtesy of Tecta America Corp.) www.metalconstructionnews.com September 2012 METAL CONSTRUCTION NEWS 27