When properly installed, fiber glass insulation improves the energy efficiency of a structure and allows a builder to cost-effectively meet the required energy budget. Initial construction provides the best opportunity to ensure that a home is comfortable and energy-efficient. Builders should consider adding insulation above the required minimums for a number of reasons:

Reduces heating and air conditioning operating costs (lower utility bills) Allows for use of a smaller, less expensive air conditioner)) Provides higher comfort (no hot spots or drafty wall areas) and controls moisture intrusion Allows a builder to cost effectively meet the required energy budget, reduce call-backs and build a better home Improves building acoustics, reducing sound transmission between rooms and from outside the building

Fiber glass batt and roll insulation comes in various thicknesses (R-values). The most common R-values are R-11, 13, 15, 19, 21, 22, 25, 30 and 38. This insulation is most commonly installed in walls and attics, as well as raised floors and floors over garages, crawl spaces and basements. Loose-fill insulation may also be used.