Attic insulation performs a crucial position in dwelling energy performance. Actually, most building scientists agree that the attic must be the first “goal” space for insulation and air-sealing upgrades. Most properties are constructed with code-required minimal levels of attic insulation which can be far beneath current suggestions established by the U.S. Dept. of Energy.
Homeowners contemplating an attic insulation improve have a number of different insulation materials to consider. Each attic insulating possibility has distinct benefits and limitations. Understanding these execs and cons may help you choose one of the best insulation improve to your attic.
Fiberglass batt insulation is popular because it’s affordable and universally available. Regardless of age, many houses have attics insulated with fiberglass batts. The batts are typically installed between attic ground joists, and unfaced batts are more widespread than confronted batts in attic installations.
PROS: Extra affordable than different varieties of attic insulation. Greatest type of insulation installation wlanut creek for DIYers to install. Unlike blown insulation, batts might be lifted up and moved to supply entry to the ceiling below, can lights and ceiling-mounted vent fans. Present batt insulation can often be left in place when blown insulation is added to extend general R-value in the attic.
CONS: Difficult to install accurately around obstructions. Voids where insulation is lacking contribute to significant energy loss. Multiple layers of batt insulation are required to achieve really helpful R-values in most components of the country; this makes it unattainable to use the attic for storage unless particular platforms are built prior to insulation installation. Fiberglass insulation cannot stop air movement.
Two primary forms of blown (or blow-in) insulation are commonly used: cellulose and unfastened-fill fiberglass. Both varieties are designed to be put in using special blowing equipment.
PROS: Installation may be accomplished rapidly and affordably. Blown insulation typically ends in more complete coverage than is feasible with fiberglass batts.
CONS: A thick layer of insulation (no less than sixteen in. for northern elements of the U.S.) is required, and this makes it unattainable to use the attic house for storage unless particular platforms are built previous to putting in the insulation. Cellulose and free-fill fiberglass insulation can’t stop air movement.
Professional spray foam insulation contractors typically insulate an attic by making use of a thick layer of spray foam between the rafters. Two varieties of foam are used: open-cell and closed-cell. Opinions differ as to which kind is greatest in an attic set up, however closed-cell spray foam is used extra frequently.
PROS: Closed-cell spray foam gives the best R-value per in. (about R-6) of any attic insulation. It also creates an air and moisture barrier, so it eliminates the necessity for separate air-sealing work. Insulating beneath the roof deck as a substitute of on the attic floor frees up attic space for storage and different purposes. This technique additionally improves the efficiency of HVAC elements (like air handlers and ductwork) situated within the attic.
CONS: Most expensive attic insulation. A thick layer of foam utilized to the underside of the roof sheathing can lure moisture and cause sheathing to rot.
Rigid foam hasn’t been used as extensively for attic insulation till a most recent development. In one unique system, a proprietary rigid foam panel is mounted to the underside of attic rafters, forming an air and thermal barrier.
PROS: Supplies all the benefits of spray foam, with the additional advantage of maintaining attic ventilation. The potential for roof sheathing moisture damage is eliminated. The inflexible foam is confronted with a radiant barrier that reflects warmth for extra energy savings -another benefit over spray foam.
CONS: The system is available in limited areas, so it is not as extensively available as spray foam. Installation cost is bigger than fiberglass batts and blown insulation, but competitive with spray foam.