Can wireless sensor networks help designers and building owners better understand how green roofs actually perform? Several projects are underway to test this notion, Forbes reports. At at Walmart in Portland, Ore., a 40,000-square-foot green roof that is broken in three sections will be outfitted with dozens of sensors and a weather station as part of a two-year project with Portland State University. The full Walmart roof also comprises 52,000 square feet of white membrane roofing material to complete the store's total roof, so the data from the vegetated sections and the white roof sections will be compared side-by-side in regards to surface temperatures, water flow, and building operations underneath each part. A similar set of data is being collected at a Walmart in Chicago, and that will also be used for comparison. Read More