The primary intent of the cool roof is to reduce the amount of energy absorbed by a roof surface. It is an easy and cost effective way to lower energy consumption of a building. The technologies include coatings, membranes, tiles and shingles.
Cool Roof reflects most of the sun’s heat and improves building efficiency by reducing cooling costs and offsetting carbon emissions. The roofs are made of materials that can reflect solar energy away from the structure below it. The materials can include specially coated metal, glazed tile, high-albedo paint and even asphalt shingles. In hot climates, cool roofs can reduce the cost of air-conditioning by up to 20%. For example, Cool Shield heat reflective coating and Insulla heat insulation tiles, the products of Japeva Engineering Pvt. Ltd, come with high solar reflectance and high thermal emittance properties thus, allowing the building to remain cool.
The water based heat reflective coating Cool Shield can easily be applied to the complete exterior of the buildings including roof and walls. It is cost effective, easy to maintain and environment friendly. The product with the combination of lime-cement enriched with micro spheres, non-conductive fillers and special eco-friendly additives reflects solar energy and have low thermal conductivity which enhances the insulation effect. This high performance powder based coating reflects solar infrared (57% of heat from the sun) and visible rays (40% of heat from the sun). It operates on three levels i.e. solar reflectivity, heat emissivity and high solar reflective index.
The coating’s dry thickness film of 200um has a high emissivity and does not allow the passage of heat to reach the substrate. The advantages of the Cool Shield coating comprises reduced air-conditioning costs by 20% per annum, Solar Reflectance 88%, infrared emittance 88% and low ceiling cavity temperature.
Insulla heat insulation tiles are made from PCM (Phase Change Material) technology by using micro encapsulated PCMs which are leak-proof and stable. PCM is the application of geo-inorganic products that can be used for the efficient storage of heat or cold and to mitigate the extremes of temperature. PCM sometimes referred to as latent heat storage material absorbs or releases heat energy associated with phase changes known as latent heat.
The tiles help cool down the building by about 60F and save energy consumption by almost 30%. While these external tiles are smooth and glossy and 100% waterproof, they also help in reducing power consumption by cooling the top floor of a building. Furthermore, Insulla tiles reduce roofing costs, dead load and CFC emissions of a structure. Being more cost effective than lime terracing, they are an easy and durable option. Its easy application makes the tiles suitable for rooftops, building walls as well as swimming pool bays and walk ways.