The Building Codes for Attic Insulation

Ensuring that your attic insulation complies with local and state building codes is vital to maximizing your energy efficiency, comfort and safety. In addition, proper attic insulation can help you qualify for a variety of energy efficiency rebates.

The type of attic insulation you choose depends on factors like your budget, attic space and climate conditions. Some popular types include fiberglass batts, blown-in cellulose and spray foam.

Best Materials for Attic Insulation for Summer Heat

Fiberglass batts are a cost-effective attic insulation material that comes in pre-measured bags. When installed properly, they can achieve the R-value required by your local building code. For best results, cut the fiberglass batts 1-inch less than the center measurement between joists (for example, a 12-inch gap will require cutting the batt to 11 inches).

Blown-in cellulose and mineral wool insulation can also be used to meet building code requirements for attic insulation. These products offer better thermal performance than fiberglass batts because they fill gaps and voids more effectively.

Rigid foam insulation, which comes in panels made of polystyrene, polyisocyanurate or urethane, is another common attic insulation option. It offers a high R-value per inch, and acts as an air barrier that reduces moisture infiltration and air leaks. It is expensive, however, and must be installed by a professional due to the chemicals involved in its handling and installation process.

Spray foam insulation, either open- or closed-cell, is a high-performance attic insulation material that can be installed in vented and unvented attics. This product is a two-part liquid that expands to form a solid insulator upon curing, and seals air leaks and voids more effectively than other attic insulation types.

The Foam Guy
642 Moffitt Hill Rd, Old Fort NC 28762
(828) 808-6923‬