Ford Motor Co. last month unveiled a huge green roof at its new truck plant in Dearborn, Mich. The roof is covered with 10.4 acres of sedum, a genus of perennial plants that tops a 3-in.-thick, four-layer system incorporating a root-resistant membrane, a drainage layer, a fleece mat, and a vegetation blanket (see schematic). The top inch-thick "growth substrate" consists of expanded shale, sand, peat, compost, and dolomite. The vegetative roof is supported by a modified bitumen roofing system.
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