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It keeps cold air out in the winter and warmth in. And keeps hot summer air out and cool air in.

The insulation traps pockets of air which slows down the transfer of heat from one area to another. The material which makes up the insulation also slows down the transfer of heat. This slowing down is called resistance, hence the measurement on insulation, R-values. Some insulation do act as an air barrier (and some can even act as a moisture barrier); however this is not always the case. In modern building methods, we use an additional air and/or moisture barrier to help maintain the comfort in the home. You do not want to stop air flow in all situations, and you really do not want a moisture barrier in areas along the Gulf Coast- this can harm the structure of the home.

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15y ago

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