This occurs because evapotranspiration from greenroof plants and media cools the roof surface.
Green roof reduce air conditioning costs.
While it is difficult to calculate the savings as utility costs vary from city to city the national research council of canada estimates a green roof can reduce air conditioning use in a building.
While utility costs vary between cities the national research council of canada estimates a green roof can reduce air conditioning use by up to 75 percent.
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 economic benefits of any individual green roof will however depend on its design geographic location surroundings and the building itself.
Labor makes up a significant portion of the cost of a green roof mostly because the process of creating one can be labor intensive.
Costs of a green roof tray system range from 10 to 30 per square foot.
Used in conjunction with solar instead of electric attic fans an attic s temperature can be lowered by 50 which can save a homeowner or business owner up to 30 on their air conditioning.
But according to the national research council of canada a green roof can reduce air conditioning.
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.
The rebates are designed to offset the cost of building a cool roof compared to a conventional roof jacot said.
Data we have collected at the penn state center for green roof research suggests that green roofs can significantly reduce air conditioning costs to the consumer and most likely reduce the associated peak demand on the utility.
1 3 these temperature reduction and energy efficiency benefits are a key contributor to the growing popularity of green roofs in the.
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 s surface.
This roof type can be much more expensive to implement than other efficient roof options so you should carefully assess your property and consult a professional before deciding to install a green roof.
The exact amount of savings is difficult to calculate as utility costs vary from state to state.
Labor costs to install a green roof.
Ladwp s rebates for cool roofs have been offered since 2010 and have helped pay for about 700 000 square feet of residential cool roof materials used for both single family and multi family buildings.
