All the materials used for construction of building absorb and transfer heat inside of the building all the day. Heat always flow from the warmer side to cooler side and cooler to warmer side. 80% to 95% of heat gain during summer and about 70% of heat loss during winter trasferred through the walls, ceiling and roofs of the building by way of conduction and radiation. The conventional insulation only slows down the rate of heat transfer which after saturation cannot stop radiant heat.
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Salt Lake, Kolkata, West Bengal