Attic insulation performs a critical function in residence energy performance. In truth, most building scientists agree that the attic must be the primary «target» area for insulation and air-sealing upgrades. Most houses are built with code-required minimal levels of attic insulation which are far under present recommendations established by the U.S. Dept. of Energy.
Homeowners considering an attic insulation upgrade have a number of various insulation materials to consider. Every attic insulating option has distinct advantages and limitations. Understanding these pros and cons may help you select one of the best insulation upgrade to your attic.
Fiberglass batts
Fiberglass batt insulation is well-liked because it’s affordable and universally available. Regardless of age, many houses have attics insulated with fiberglass batts. The batts are typically put in between attic floor joists, and unfaced batts are more widespread than faced batts in attic installations.
PROS: More affordable than other types of attic insulation. Best type of insulation for DIYers to install. Unlike blown insulation, batts might be lifted up and moved to provide access to the ceiling under, can lights and ceiling-mounted vent fans. Present batt insulation can often be left in place when blown insulation is added to increase total R-worth in the attic.
CONS: Troublesome to put in appropriately around obstructions. Voids where insulation is missing contribute to significant energy loss. A number of layers of batt insulation are required to achieve beneficial R-values in most parts of the country; this makes it inconceivable to make use of the attic for storage unless special platforms are built previous to insulation installation. Fiberglass insulation can’t stop air movement.
Blown insulation
Two foremost types of blown (or blow-in) insulation are commonly used: cellulose and loose-fill fiberglass. Each types are designed to be put in utilizing particular blowing equipment.
PROS: Set up will be accomplished quickly and affordably. Blown insulation typically leads to more complete coverage than is possible with fiberglass batts.
CONS: A thick layer of insulation (at least sixteen in. for northern parts of the U.S.) is required, and this makes it not possible to make use of the attic house for storage unless particular platforms are constructed prior to installing the insulation. Cellulose and loose-fill fiberglass insulation can’t stop air movement.
Spray foam
Professional spray foam insulation contractors typically insulate an attic by making use of a thick layer of spray foam between the rafters. Two types of foam are used: open-cell and closed-cell. Opinions fluctuate as to which type is best in an attic set up, but closed-cell spray foam is used more frequently.
PROS: Closed-cell spray foam provides the highest R-worth per in. (about R-6) of any attic insulation. It additionally creates an air and moisture barrier, so it eliminates the need for separate air-sealing work. Insulating beneath the roof deck instead of on the attic floor frees up attic space for storage and other purposes. This strategy also improves the effectivity of HVAC parts (like air handlers and ductwork) positioned within the attic.
CONS: Most costly attic insulation. A thick layer of foam applied to the underside of the roof sheathing can trap moisture and cause sheathing to rot.
Inflexible foam
Inflexible foam hasn’t been used as extensively for attic insulation till a most up-to-date development. In one distinctive system, a proprietary inflexible foam panel is fastened to the underside of attic rafters, forming an air and thermal barrier.
PROS: Provides all the benefits of spray foam, with the additional benefit of maintaining attic ventilation. The potential for roof sheathing moisture damage is eliminated. The rigid foam is faced with a radiant barrier that displays heat for additional energy financial savings -one other advantage over spray foam.
CONS: The system is available in limited areas, so it’s not as widely available as spray foam. Set up cost is bigger than fiberglass batts and blown insulation, but competitive with spray foam.
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