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Fiberglass insulation has been the most popular insulation material for either commercial or residential projects. Its high R rating and ease of use are the biggest reasons fiberglass tops the list among the several available insulation technologies.

The term R rating is defined as the capability of a material to stop the transfer of heat; the product will function more effectively the greater its R value. Insulation with higher R values will help to keep the heat inside and save you money on your overall energy costs. Different areas of the country will have different R value requirements, and will therefore need different kinds of insulation products. You will not require a high R value insulation if you live in a warm climate. You will see the most benefit from high R value products in colder climates, as it is the most efficient insulation at curtailing heat loss.

Because it is in the “loose-fill” category, fiberglass is ”squashable” enough to fit into even the smallest space and also insulate the large areas of walls and attics. Fiberglass insulation is made using glass that has been melted and then spun into fibers. Using recycled glass for much of the raw materials makes fiberglass insulation a reliable and “green” product. This fiberglass is then packaged as either rolls (utilizing a backing paper) or loosely bagged “blow-in” insulation.

The most popular type of insulation used in residential applications is fiberglass blankets, which are most often sold in widths which fit snugly in the space between joists and between wall studs. The big, pink rolls of fiberglass insulation have become a common sight.

Blown in insulation is best for areas where accessibility is too difficult, like eaves and irregular crawl spaces. Using this type of insulation, small pieces of fiber are quickly blown into the space using specialized equipment. To help protect against settling, which could lessen its effectiveness, many of the blow-in products come with a special glue that holds all of the fiber pieces in place.

Another looming difficulty with blow-in fiberglass is the mess. If you rile up the stuff, it will wind up in places you don’t want it, like on the rugs and in your lungs and down your back. Therefore, if you plan on using your attic as a storage space, it would be best to use the pink rolls and then cover the joists with plywood. This will have the added benefit of further insulating the house. You can also box in the blow-in fiberglass, but working with the rolls is just so much easier, less time consuming, and cheaper.

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