InsulationThe main function of insulation is to keep the heat in. To be effective, insulation must be:
resistant to heat flow;
able to fill the space completely and evenly durable;
In some locations, it must be able to withstand exposure to heat or moisture.
The proper choice of insulation depends on its final use. In most applications, good resistance to heat flow is not the only thing you will have to consider. In specific situations, insulation may also need some of the following properties:
1.Resistance to high temperatures
2.Resistance to moisture flow (can it reduce the movement of water vapour?)
3.Resistance to air movement (can it act as an air barrier?)
4.A fire-rated protective covering.