White roof - cool in the heat

What is " white roof" ?

  " White roof" is a roof painted with white paint reflex that reflects over 80% sunlight (compared to standard roofs have 20% reflectivity ) . What distinguishes

  reflex than ordinary paints are two important characteristics : light reflectance index (SRI) and thermal radiation (the ability of the roof surface to give the absorbed heat). If you ever

  You wore a black T-shirt, you are already aware that reflectance black is negligible , and the ability to give off heat - zero . White paint reflex can reach 90%

  reflective ability and 100% heat radiation .

Benefits to owners and occupants

Reduce electricity bills , as it reduces the need to use air conditioning in the summer ;

Increased comfort inside buildings without air conditioning ;

Decrease the temperature of the cover , which prevents the occurrence of cracks and wrinkles due to thermal effects , and thus prolongs the life of the roof.

Benefits for society and the environment

White roofs, especially when performed on a large number of buildings in a village can have a significant effect :

reduce overheating in urban areas - known as the " urban heat island"

reduction of emissions of greenhouse gases by reducing the use of electricity for cooling in summer