Environmental Design + Construction - October 2008 - (Page 38) Cool Roofing With the increased number of opportunities to provide green roofs, the topic of discussion this year has focused on the maintenance of vegetative roofs. also installed Sarnafil green roofs, Henry, GreenGrid, and is approved to install Firestone, GAF, Live Roof, Carlisle and Barrett.” MAINTENANCE OF GREEN ROOFS With the increased number of oppor tunities to provide green roofs, the topic of discussion this year has focused on the maintenance of vegetative roofs. “Prospect has and continues to develop our crews’ capability for maintaining green roofing applications,” Stamer said. “More and more specifications are requiring maintenance be included for the first year or two as a condition of the contract.” The norm, Stamer said, is to achieve 80 percent coverage within the first two years. “The key is to ensure that sedums are established within the first three months,” he said. “This may mean two to three trips a month for weeding and watering with a special emphasis on spring and fall.” Still, Stamer said one to two trips per month for the remaining nine months to weed and water may be necessary, or approximately eight to 10 trips in the second year. “We automatically schedule this work,” Stamer said. “Each crew repor ts on the progress of the roof and whether additional trips are necessary.” Prospect Waterproofing made green roof maintenance a priority to ensure that building owners were satisfied. “Prospect star ted maintaining our green roofs as it was clear that owners/developers expected that once complete they would be able to view and show off the fully grown completed roof to their clients, occupants and even competitors,” Stamer said. “We also noted that we had control over the maintenance by performing it internally. Owners spending additional funds for green roofing projects have high expectations. If no maintenance plan is called for weeds/ spurge, it will begin to grow and choke off sedum promulgation.” TIPS ON EDUCATING BUILDING OWNERS Stamer provided several keys to help educate building owners. Staying observant of plant progress, early recognition of issues and expeditious correction of problems are keys to successfully establishing a roof garden. GREEN ROOF SYSTEMS Stamer said Prospect Waterproofing Co. has found that the Protected Membrane Assembly is particularly suited for a green roofing application. “As hot rubberized asphalt came from the waterproofing world, they are comfor table warranting their products in a green roofing application,” Stamer said. “Prospect Waterproofing has worked with American Hydrotech on many green roofing projects, especially on concrete structures.” 38 Cool Roofing Stamer noted American Hydrotech was one of the first to introduce green roofing technology to the American marketplace in teaming with ZimCo, and it continues to offer a full product line for green roofing assemblies. “Hydrotech has invested in the industry by placing on their staff both a soils engineer and landscape architect to assist the design community and provide tech suppor t to approved contractors,” Stamer said. “Prospect has > Fall 2008
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