Green Roof Vs Traditional Roof

Looking great energy efficient and environmentally friendly too green roofs better utilise an often neglected area.

Green roof vs traditional roof. Although installation of a green roof usually involves higher upfront costs than a traditional roof there are many economic benefits that can make up for this. Cool roofs are even cheaper than green roofs only costing 0 75 to 1 50 per square foot and a single ply cool roof membrane usually ranges from 1 50 to 3 per square foot according to. We chose a value of 05 for existing dark roof solar reflectance because a typical roof is covered in black tar which has a solar reflectance value less. Because the calculator we used compares green roofs to traditional roofs the calculator has the r value of traditional roofs built in.

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. Green roofs are covered with plants and vegetation bringing a number of excellent benefits to every building. Increased r value a measure of the resistance of a material to heat flow of the roofing system along with reduced temperatures on the roof lessen hvac loads resulting in energy. 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.