Modular Goes Green—and Greener
While modular units themselves can't be LEED certified (they're considered products rather than buildings, and the USGBC doesn't have a product certification category), the units may contribute at least one Innovation Credit. “Our best way of aligning with the green movement and enabling LEED projects is to offer a temporary solution that's part of a larger strategy for achieving LEED certification of the permanent structure,” says Cunningham.Williams Scotsman's strategy for going green led to the manufacturer's three-model lineup:
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Light-green units utilize an existing chassis (single-wide, 12x60-foot, or double-wide, 24x60-foot) that is recycled and retrofit with green products and energy-saving systems, including programmable thermostats, motion-sensor lighting, T-8 lighting, and upgraded weather stripping.
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Medium-green units also recycle existing modular chassis in either single- or double-wide configurations, and include all the green upgrades offered in the light-green units, but add new energy-efficient HVAC systems, Greenguard-certified insulation, a white EPDM roof, recycling stations, dual-flush toilets, larger windows for enhanced daylighting, and low-VOC floor, ceiling, and wall materials and finishes. Both light- and medium-green units will be built on a factory's existing assembly line.
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The dark-green model is a highly customized unit built off the assembly line and tailored to a specific customer's need and jobsite. These sustainable modular units, which can be installed horizontally or stacked, include all of the manufacturer's eco-offerings, plus the possibility of adding such elements as photovoltaics, rain screens, and light sills.