Insulation can absorb sound, reducing the unwanted noise from appliances, audio equipment, conversation and other sources of sound that are transmitted through your walls and floors. Insulation also keeps your family more comfortable by making it easier for your furnace or air conditioner to maintain a constant temperature.
If a duct system is not properly sealed, it can let conditioned air escape, or allow contaminated or unconditioned air to enter the system. Not only does this increase heating and cooling costs, it can draw humidity, dust, mold spores and other contaminants into the system from the attic, crawl space or garage—or even radon gas from the soil. Home Insulation Can Mean Big Energy Savings See the difference in your energy bills every month. Every improvement you make, from wall and water heater insulation to window and door sealing, will reduce your energy usage and save you money. For example, properly insulating and air sealing your attic could help you save up to 20% on each energy bill you pay—that adds up!
To achieve the maximum thermal efficiency and comfort it is important to insulate any space were energy could be lost. For optimum energy savings and comfort, consider adding additional insulation to your home.
Fiber glass insulation in attics and flat ceilings makes the home more resistant to energy loss and lowers energy bills. To achieve R-values of R-38 and higher, two layers of fiber glass batts can be used and their R-value combined. For example, an R-19 batt added to an R-30 will yield an R-49. When installing a second layer, always use unfaced insulation. Also, it is recommended that the second layer be applied across the joists. Fiber glass or mineral wool loose-fill insulation can also be used.
Sections sometimes overlooked in homes are walls between living spaces and unheated garages or storage rooms, dormer walls, and the portions of walls above ceilings of adjacent lower sections of split-level homes. Today’s fiber glass insulation products are manufactured to fit in both 2 x 4 and 2 x 6 construction.
Areas that are often not insulated are floors over unheated or open spaces such as garages or porches, floors over unheated basements and the cantilevered portions of floors. Fiber glass batts can be used in these areas. When insulating floors over unheated basements or crawl spaces, faced products should be used and vapor retarders should face heated areas and be in contact with the subfloor.
For finished basements, R-13 fiber glass batts can be used. Vapor retarders should face heated areas and be covered as soon as possible. For insulating foundation walls of heated crawl spaces, use either unfaced insulation where the building code does not require a vapor retarder, or insulation with a special facing recommended for exposed applications. The insulation should be fastened to the sill plate and draped down the wall. Verify that the walls are dry and do not leak ground moisture