Green Roof Cost Savings

Cost benefit evaluation of ecoroofs 2008 pdf 37 pp 2 1 mb about pdf this report attempts to quantify the private and public costs and benefits of green roofs or ecoroofs in portland oregon.

Green roof cost savings.

They are fairly lightweight and can be installed on roofs with a pitch from 0º to 30º. The green roof provided an annual energy saving of 1 6 in cooling and 0 5 in heating. An extensive green roof is the most common and least expensive type of green roof with costs ranging from 10 20 a square foot 2. Based on these considerations recover green roofs has found that extensive roofs can cost about 10 to 50 per square foot while intensive roofs can cost from 20 to 200 per square foot.

Over its estimated lifespan of 40 years a green roof would save about 200 000 of which nearly two thirds would come from reduced energy costs. The largest reductions were seen in rooms directly below the green roof and no reductions were found more than three floors down. Ecoroofs are expected to be an important part of the city s urban strategy as it grows and density increases in the decades to come. The u value of the roof was reduced from 0 59 to 0 42 with a green roof and 0 38 for the green roof with water storage.

Over its lifetime though the green roof would save about 200 000.