The insulation R-value is the way we measure the resistance to heat flow, also called thermal resistance.  The higher the attic insulation R-value, the more resistant to heat flow it is, which makes it a better choice.  This is determined by the material, thickness and density of the insulation; however, there are other factors that can alter the rating.

Causing the insulation to be compressed by putting it in an area too small for it or putting denser insulation on top of lighter will keep it from getting the full rating; as will insulating only between joists, studs, and rafters, therefore not retarding the heat flow through them.

The R-value has to be listed on the packages of insulation, so it is very important to read these packages.  Some new products are getting a better rating while thinner, but some materials have to be thicker initially to make sure you get the right rating under a range of temperatures or to offset settling.  Closed-cell foams have a higher rating per thickness than open-cell foams and where space is limited, you might need rigid insulation to get a high enough rating.

The purpose of insulating your house is to keep the heat in during the winter months and out during the summer, thereby saving you money on energy bills and making your home more comfortable.  How much energy you will be able to save depends on various things, such as, the local climate where you are, the shape, size and construction of your home as well as the type of your heating and cooling systems and how efficient they are, your living habits and the type of fuel you use.  Insulating your home is not cheap, but when you consider that 50-70% of energy use goes to heating and cooling for the average American, it is worth it.

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