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Insulation has a big effect on a home's lifetime operating expenses. And once in place, it cannot be cost-effectively altered, so it's important to install it right the first time. Builders should not settle for mediocrity in insulation. There are two keys to a quality insulation job: choosing the right material for the situation and installing it properly. The details of correctly supporting and protecting each material are important. Let's take a look at the main products I handle — fiberglass, cellulose, and spray-applied low-density expanding foam — and discuss where and how to use each one to best advantage. Fiberglass Batts Cheap to buy, fiberglass batts are also quick and easy to install, particularly in walls. But adequate