Green Roof Savings

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.

Green roof savings.

Shading the outer surface of the building envelope has been shown to be more effective than internal insulation. But according to the national research council of canada a green roof can reduce air conditioning. Many studies have been conducted to assess the extent of energy savings possible with extensive green roofs. The study looked at a range of benefits of green roofs including stormwater management improved health benefits due to reduced pollution and energy savings.

One of these benefits is the potential for building energy savings where a green roof can reduce annual heating and cooling loads. 1 2 in addition green roofs can reduce building energy use by 0 7 compared to conventional roofs reducing peak electricity demand and leading to an annual savings of 0 23 per square foot of the roof. There are many different reported benefits that the addition of a green roof to a building can offer. The exact amount of savings is difficult to calculate as utility costs vary from state to state.

Green roof temperatures can be 30 40 f lower than those of conventional roofs and can reduce city wide ambient temperatures by up to 5 f.