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Insulation provides a thermal barrier that keeps your house cooler in the summer and warmer in the winter. Insulation should be placed in all external walls and ceilings. Rated with an "R" rating to indicate its effectiveness as an insulator (the higher the rating the higher the insulation capability), insulation comes in various materials and forms. The three most common are: blankets, blow-in, and rigid. Rigid, such as polystyrene polyurethane foam panels, is usually used by contractors in new construction. Insulation works by trapping air inside, so contractors should not compress it or it will loose its insulation value. Also, it can be important that a contractor completely insulate. Leaving a doorway un-insulated, for example, will greatly diminish the value of the remaining insulation work.
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