A significant trend in recent years in the field of construction is the reduction of energy intensity of buildings. One of the possible ways to achieve this is the construction of so-called cool roofs.
Cool roofs minimize the absorption of solar heat and keep roof surfaces cooler. By choosing a suitable material, it is possible to achieve high reflectivity of the sun’s rays from the roof surface and also a significant reduction in the amount of heat that passes through the roof into the interior, which is then overheated. This leads to a reduction in the energy requirements of the building and thus a reduction in the energy consumption required for internal cooling. Lower energy consumption for cooling means a lower need for electricity production and thus a reduction in greenhouse gas emissions. Increased light reflectance, including UV radiation, also has a positive effect on extending the life of roofing materials.
By reflecting heat back into the atmosphere, cool roofs also contribute to better air in large cities, reducing the effect of heat islands, which arise due to high temperatures in urban areas. By massively using roofs with a surface highly reflective to light and heat, a certain cooling effect can therefore be achieved in cities. This is indirectly related to a certain improvement in the air, because lowering the temperature also means less risk and smog concentration.
The main parameter that expresses the ability of materials to reflect solar radiation is the so-called SRI index. The SRI index includes a combination of two properties – solar reflectivity and thermal emissivity (the ability of materials to dissipate heat). It is defined so that standard black (reflectivity 0.05, emissivity 0.90) has an SRI of 0 and standard white (reflectivity 0.80, emissivity 0.90) has an SRI of 100. The higher the SRI value, the lower the surface temperature. exposed to sunlight and thus better parameters in terms of cool roofs.
As already mentioned, light colors, especially white, have a high solar reflectivity. Fatra has responded to this trend by offering roof waterproofing membrane FATRAFOL 810 / V in two colors, white RAL 9010 and light gray RAL 7035 for roof waterproofing.
The mentioned color shades show two levels of SRI index. FATRAFOL 810 / V membrane in white reaches a value even higher than 100, specifically 108, and this membrane is suitable for all applications where the highest requirements are placed on the reflectivity of sunlight from the surface of the roof cladding. The light gray membrane in the new basic color shade RAL 7035 has an SRI index of 54, which ensures higher reflectivity of sunlight and less heating of the roof covering for new roofs insulated with FATRAFOL membranes.
These values represent a great potential for Fatra and its business partners, who are engaged in the construction and design of buildings, to respond to current trends in reducing the energy performance of buildings. FATRAFOL 810 / V membranes can be applied to all types of roofs, including, apartment buildings, industrial buildings, commercial buildings, hospitals and offices. Not only will it improve thermal comfort inside buildings, but thanks to the mitigation of the effects of high summer temperatures, the service life of roofing membranes is also extended.
FATRAFOL 810 / V waterproofing membrane (white color) was used for insulation of the new hall in the area of the large CTPark logistics center in Bor u Tachova. The total insulated area is 57,305 m2, the supplier of insulation work was the company PS BRNO, s.r.o.