• Credit: Jonathan House

Multnoah County Central Library / Portland, Ore. /

A new vegetated roof atop this library replaced the former leaking roof. The vegetated roof, which cost $180,000 and covers 7,188 square feet (668 m2), contains more than 17,000 sedums and grasses. An interlocking tray system met the county’s need for sustainability and cost effectiveness. The roof is one of the county’s more than 25 adopted sustainability initiatives. Benefits will include minimized rainwater runoff and pollution of nearby rivers, decreased energy costs, extended roof lifespan and mitigated urban-heat-island effect. The general contractor was Snyder Roofing of Oregon LLC, Tigard, Ore.

PROJECT SUBMITTED BY COLUMBIA GREEN TECHNOLOGIES INC., TUALATIN, ORE., WWW.COLUMBIAGREENROOF.COM