I ran into a pretty thorough article on green roofing and wanted to pass it along to readers. There’s a growing interest in green and vegetative roofs, although one may not be perfect for every application. That said, there are numerous benefits and advantages to having a green roof.
Simply put, here are the benefits: (1) opportunity to utilize wasted or otherwise unused space, (2) reduction of storm water runoff, (3) mitigation against urban heat island effect, (4) airborne toxins are taken out of the air with oxygen getting released, (5) reduction in peak load (lower energy costs) for the building with the green roof, (6) longer roof life, and (7) considerable insulation from noise pollution.
Here are some of the drawbacks: (1) could cost up to twice as much as a conventional roof (but will offer a payback of 5-10 years in energy savings), (2) could be difficult to get zoning approvals depending on the sophistication of the approving authority, and (3) will constrain some types of architectural expression.