Attic insulation performs a important position in house energy performance. In fact, most building scientists agree that the attic must be the primary “target” space for insulation and air-sealing upgrades. Most houses are built with code-required minimal ranges of attic insulation which might be far beneath current recommendations established by the U.S. Dept. of Energy.
Homeowners contemplating an attic insulation improve have a number of different insulation supplies to consider. Every attic insulating choice has distinct advantages and limitations. Understanding these pros and cons may help you select one of the best insulation upgrade for your attic.
Fiberglass batt insulation is widespread because it’s affordable and universally available. No matter age, many houses have attics insulated with fiberglass batts. The batts are typically installed between attic floor joists, and unfaced batts are more widespread than confronted batts in attic installations.
PROS: More affordable than other varieties of attic insulation. Greatest kind of insulation for DIYers to install. Unlike blown insulation, batts could be lifted up and moved to offer entry to the ceiling beneath, can lights and ceiling-mounted vent fans. Present batt insulation can usually be left in place when blown insulation is added to increase overall R-worth within the attic.
CONS: Troublesome to put in appropriately around obstructions. Voids where insulation is missing contribute to important energy loss. A number of layers of batt insulation are required to attain really useful R-values in most components of the nation; this makes it not possible to make use of the attic for storage except particular platforms are constructed prior to insulation installation. Fiberglass insulation cannot stop air movement.
Two predominant varieties of blown (or blow-in) insulation are generally used: cellulose and unfastened-fill fiberglass. Each types are designed to be installed using special blowing equipment.
PROS: Set up may be accomplished shortly and affordably. Blown insulation typically results in extra full coverage than is feasible with fiberglass batts.
CONS: A thick layer of insulation (at the very least 16 in. for northern elements of the U.S.) is required, and this makes it inconceivable to use the attic house for storage until particular platforms are constructed prior to putting in the insulation. Cellulose and loose-fill fiberglass insulation can’t stop air movement.
Skilled spray foam insulation contractors typically insulate an attic by applying a thick layer of spray foam between the rafters. Two sorts of foam are used: open-cell and closed-cell. Opinions fluctuate as to which type is greatest in an attic insulation removal companies installation, but closed-cell spray foam is used extra frequently.
PROS: Closed-cell spray foam gives the highest R-worth 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 an alternative of on the attic floor frees up attic area for storage and other purposes. This technique additionally improves the effectivity of HVAC elements (like air handlers and ductwork) positioned in 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 until a most recent development. In one distinctive system, a proprietary rigid foam panel is mounted to the underside of attic rafters, forming an air and thermal barrier.
PROS: Offers all the advantages of spray foam, with the additional good thing about maintaining attic ventilation. The potential for roof sheathing moisture damage is eliminated. The inflexible foam is faced with a radiant barrier that displays warmth for added energy savings -one other advantage over spray foam.
CONS: The system is available in restricted areas, so it isn’t as broadly available as spray foam. Set up cost is bigger than fiberglass batts and blown insulation, however aggressive with spray foam.