Attic insulation plays a essential position in dwelling energy performance. In fact, 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 are far beneath current suggestions established by the U.S. Dept. of Energy.
Homeowners considering an attic insulation improve have a number of various insulation materials to consider. Each attic insulating option has distinct benefits and limitations. Understanding these pros and cons can help you choose the most effective insulation upgrade in your attic.
Fiberglass batt insulation is common because it is affordable and universally available. Regardless of age, many houses have attics insulated with fiberglass batts. The batts are typically put in between attic flooring joists, and unfaced batts are more common than confronted batts in attic installations.
PROS: More affordable than different sorts of attic insulation. Greatest sort of insulation for DIYers to install. In contrast to blown insulation, batts could be lifted up and moved to offer access to the ceiling below, can lights and ceiling-mounted vent fans. Existing batt insulation can usually be left in place when blown insulation is added to extend general R-worth in the attic.
CONS: Troublesome to install appropriately around obstructions. Voids where insulation is missing contribute to important energy loss. A number of layers of batt insulation are required to achieve beneficial R-values in most elements of the nation; this makes it not possible to make use of the attic for storage until particular platforms are constructed previous to insulation installation. Fiberglass insulation can’t stop air movement.
Two major varieties of blown (or blow-in) insulation are generally used: cellulose and loose-fill fiberglass. Both varieties are designed to be installed using special blowing equipment.
PROS: Set up might be completed quickly and affordably. Blown insulation typically leads to extra complete coverage than is possible with fiberglass batts.
CONS: A thick layer of insulation (no less than sixteen in. for northern components of the U.S.) is required, and this makes it not possible to make use of the attic space for storage unless special platforms are constructed prior to installing the insulation installation danville. Cellulose and unfastened-fill fiberglass insulation cannot 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 sorts of foam are used: open-cell and closed-cell. Opinions range as to which type is finest in an attic set up, however closed-cell spray foam is used extra frequently.
PROS: Closed-cell spray foam gives the best 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 ground frees up attic space for storage and different purposes. This strategy also improves the efficiency of HVAC elements (like air handlers and ductwork) situated within the attic.
CONS: Most expensive attic insulation. A thick layer of froth utilized to the underside of the roof sheathing can entice 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 fixed to the underside of attic rafters, forming an air and thermal barrier.
PROS: Gives all the advantages of spray foam, with the additional benefit 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 additional energy savings -one other advantage over spray foam.
CONS: The system is available in limited areas, so it is not as widely available as spray foam. Set up value is larger than fiberglass batts and blown insulation, however aggressive with spray foam.