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Temperature measurements on a RENOLIT ALKORBRIGHT roofing membrane
Temperature measurements show that owing to its high solar reflectance, RENOLIT ALKORBRIGHT roofing membrane heats up substantially less than standard roofing membranes. The temperature between a RENOLIT ALKORBRIGHT roofing membrane and a black roofing membrane may differ by as much as 59%. In practice, this corresponds to a temperature difference of up to 45°C on the roofing membrane. This means on the one hand that RENOLIT ALKORBRIGHT roofing membrane emits less heat to its immediate environment, and on the other that it is less susceptible itself to temperature shocks. At a given UV exposure, this may result in longer life.
This lower temperature ensures that the roofing membrane is able to emit less heat to its environment, and as a result, has a positive influence upon the output of photovoltaic systems where these are installed upon it.
Positive influence upon the climate within the building
Owing to the low absorption of solar radiation, the heat requires longer to penetrate the building. Within the building, the peak temperature is lower, and is reached later.
During the summer months in particular, air-conditioning costs are appreciably lower as a result. This is even more the case in southerly latitudes.
CRRC rated product
RENOLIT ALKORBRIGHT roofing membrane has been included by the CRRC in its list of solar reflecting materials. The CRRC (Cool Roof Rating Council) is an independent US organization which maintains an objective list of all materials which reflect sunlight.
At 91%, RENOLIT ALKORBRIGHT's reflectance is the highest of any roofing membrane. For more information, visit www.coolroofs.org.