All the materials used for construction of building absorb and transfer heat inside of the building all the day. In most countries, energy use in the buildings sector for heating cooling represents about one third of the total energy consumption. Heat always flow from 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 transferred through the walls, ceilings 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.

All the materials used for construction of building absorb and transfer heat inside of the building all the day. In most countries, energy use in the buildings sector for heating cooling represents about one third of the total energy consumption. Heat always flow from 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 transferred through the walls, ceilings 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.