Thermal insulation is an important feature of any home or business. Apart from drastically reducing heating and cooling costs, it provides a comfortable uniformity in temperature throughout a structure. Different types of insulation have different levels of efficiency when it comes to blocking heat transfer. This efficiency is expressed as the R value of the insulation. High R value insulation is that which blocks heat transfer relatively efficiently, compared to other types of insulation.

The R value is a measure of how well an insulation slows down or blocks heat transfer under specific laboratory conditions. World-wide, the mathematical definition of R value is kelvin square meters per watt. By this calculation, the R value of most insulations is between zero and one.

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