Green Roof Temperature Difference

The ability of the material to reflect the sun s energy back into the atmosphere called solar reflectance and the amount of heat the material rejects instead of absorbs called thermal emittance both are measured on a scale from 0 to 1 with higher scores translating into cooler roofs.

Green roof temperature difference.

Green roofs have excellent noise attenuation especially for low frequency sounds. A green roof is the practice of growing vegetation directly on a roof over a waterproof membrane. At this level well prospering gr4 still showed a slight warming effect during the day with highest average value reaching 0 5 c in the morning. A roof garden is a similar technique that places container gardens on a roof.

Both techniques may partially or completely cover a 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. Comparative studies show that effect of green roofs on air temperature is more significant in hot climate. The rooftop temperature results from two different properties.

Both may feature recreational facilities or commercial facilities such as a rooftop cafe. 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 roofs can increase a building s marketability.