Attic insulation performs a essential role in dwelling energy performance. In truth, most building scientists agree that the attic should be the primary “target” space for insulation and air-sealing upgrades. Most houses are built with code-required minimal levels of attic insulation which might be far below present recommendations established by the U.S. Dept. of Energy.
Householders contemplating an attic insulation upgrade have a number of various insulation supplies to consider. Every attic insulating option has distinct advantages and limitations. Understanding these pros and cons can assist you choose the best insulation improve to your attic.
Fiberglass batt insulation installation alamo 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 extra widespread than confronted batts in attic installations.
PROS: More affordable than other forms of attic insulation. Greatest type of insulation for DIYers to install. Unlike blown insulation, batts might be lifted up and moved to offer access to the ceiling under, can lights and ceiling-mounted vent fans. Present batt insulation can usually be left in place when blown insulation is added to increase total R-worth within the attic.
CONS: Tough 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 realize beneficial R-values in most parts of the nation; this makes it inconceivable to make use of the attic for storage until particular platforms are constructed prior to insulation installation. Fiberglass insulation can’t cease air movement.
Two most important forms of blown (or blow-in) insulation are generally used: cellulose and unfastened-fill fiberglass. Each types are designed to be installed utilizing particular blowing equipment.
PROS: Set up will be accomplished rapidly and affordably. Blown insulation typically leads to extra complete coverage than is possible with fiberglass batts.
CONS: A thick layer of insulation (at the very least sixteen in. for northern parts of the U.S.) is required, and this makes it unimaginable to make use of the attic space for storage unless special platforms are constructed prior to installing the insulation. Cellulose and unfastened-fill fiberglass insulation cannot stop air movement.
Skilled spray foam insulation contractors typically insulate an attic by applying a thick layer of spray foam between the rafters. Two types of foam are used: open-cell and closed-cell. Opinions differ as to which sort is greatest in an attic installation, however closed-cell spray foam is used more 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 flooring frees up attic space for storage and other purposes. This strategy also improves the efficiency of HVAC elements (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.
Rigid foam hasn’t been used as extensively for attic insulation until a most up-to-date development. In one distinctive system, a proprietary rigid foam panel is fastened to the underside of attic rafters, forming an air and thermal barrier.
PROS: Gives all the advantages of spray foam, with the additional good thing about sustaining attic ventilation. The potential for roof sheathing moisture damage is eliminated. The inflexible foam is faced with a radiant barrier that displays heat for added energy savings -another advantage over spray foam.
CONS: The system is available in limited areas, so it is not as widely available as spray foam. Set up cost is bigger than fiberglass batts and blown insulation, however aggressive with spray foam.