Green Roof Savings

Green roofs reduce the heat flux through the roof and less energy for cooling or heating can lead to significant cost savings.

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. Many studies have been conducted to assess the extent of energy savings possible with extensive green roofs. One of these benefits is the potential for building energy savings where a green roof can reduce annual heating and cooling loads. 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.

Shading the outer surface of the building envelope has been shown to be more effective than internal insulation. Green roofs are a passive cooling technique that stop incoming solar radiation from reaching the building structure below. 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.

But according to the national research council of canada a green roof can reduce air conditioning.