Green Roof Vs Traditional Roof

Because the calculator we used compares green roofs to traditional roofs the calculator has the r value of traditional roofs built in.

Green roof vs traditional roof.

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

Green roofs are covered with plants and vegetation bringing a number of excellent benefits to every building. 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. As with anything though there are a few negatives and this post will aim to highlight both the advantages and drawbacks of implementing a green roof the benefits of. 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.