Extensive Green Roof R Value

In general the average r value of soil is 0 25 per inch so for a 12 soil depth the r value of the soil would be r 3 excluding assumptions on soil wetness and evapotranspiration.

Extensive green roof r value.

Sailor et al jbp 2011. The relation between u values and the substrate moisture was linear. Once you have more than r 20 in a roof assembly that is you meet the code things pretty much don t matter. The university of michigan performed a valuation study comparing a 2 000 square meter conventional roof and a green roof.

15 to 50 per square foot. Trnsys software simulation was implemented to quantify the energy savings. Annual energy savings green roof soil depth 33 annual energy and energy cost savings per square meter of roof for green roofs on lodging l and office o buildings with three different soil depths 5 15 and 30 cm compared to a conventional roof. For a conventional roof.

Highlights green roofs u value was experimentally determined on a paslink test cell. The cooling effect of each green roof component was demonstrated. They provide shade to the top of a building evapotranspiration. 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.

Green roof with rock wool substrate provided the higher energy savings. In other words go above r 20 and make green roof decisions for other reasons than energy. Green roofs reduce the temperature of the building and the surrounding air in multiple ways. Published literature showing extensive green roofs have r values between 1 8 and 4 8 while intensive green roofs have r values between 5 and 20.

8 to 20 per square foot. The study looked at a range of benefits of green roofs including stormwater management improved health benefits. A green roof may improve property values and marketability especially in urban areas with little green space.