R Value Of Intensive Green Roof

8 to 20 per square foot.

R value of intensive green roof.

Perhaps the most important benefit of green roofs is that they can reduce the amount of and improve the quality of stormwater runoff from a building site. The economic benefits of any individual green roof will however depend on its design geographic location surroundings and the building itself. A 2006 study by the university of michigan comparing costs of conventional and green roofs showed that on average installing a green roof costs about 22 00 sq. An intensive green roof weight varies from 35 to beyond 100 pounds per square foot when dry.

The soils of a green roof will capture a significant amount of stormwater which is absorbed and used by the planted material. For a conventional roof. With that in mind the real variable in the weight is the depth of planting material. 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.

In other words go above r 20 and make green roof decisions for other reasons than energy. 15 to 50 per square foot. Once you have more than r 20 in a roof assembly that is you meet the code things pretty much don t matter. The soil mixture is at least 8 inches deep and can be as deep as 15 feet depending on the architectural and plant features the homeowner wants.

All vegetation is planted directly into the soil mixture that makes up the rooftop.