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.

Green roof vs traditional roof.

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. 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. The issue of the italian standard uni 11235 2007 â œinstructions for the design execution control and maintenance of green roofsâ istruzioni per la progettazione lâ esecuzione il controllo e la manutenzione di coperture. 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.

Looking great energy efficient and environmentally friendly too green roofs better utilise an often neglected area. 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. Green roof components in italy green roofs are not very common yet even if they are starting to spread. Because the calculator we used compares green roofs to traditional roofs the calculator has the r value of traditional roofs built in.