Attic insulation can significantly reduce your home energy costs, especially if it is paired with attic air sealing. It can also prevent ice dams in the winter, reduce noise transmission and keep moisture from damaging your roof and wood framing.

There are a few different types of attic insulation, including fiberglass batt insulation, loose-fill insulation and rigid foam. Each type has advantages and disadvantages, but the most important factor when choosing attic insulation is to ensure it meets your specific needs.

Fiberglass batt insulation is the most common type of attic insulation and is made from recycled glass spun into fibers. It is highly effective and relatively inexpensive. It can be installed quickly and is effective in attics with standard joist spacing. However, it does not perform well in attics with irregular joist spacing or obstructions. It can also absorb moisture and sag over time.

Benefits of Upgrading Old or Damaged Attic Insulation

Loose-fill insulation is a more complex type of attic insulation and requires professional installation. It is made from small particles of fiberglass, cellulose or mineral wool and can be installed with a special blowing machine. It is more effective at filling gaps and covering surfaces evenly than traditional batt insulation and works well in attics with obstructions, uneven joist spacing and/or limited headroom. However, it can settle over time, reducing its R-value and can be difficult to remove.

Rigid foam insulation is available in panels or boards that are typically made of polystyrene, polyisocyanurate or polyurethane. It can be installed in attics with a variety of structural components and provides an excellent R-value per inch. It also acts as an air barrier, sealing leaks and preventing the transfer of heat through walls and ceilings. It is also one of the most durable and long-lasting insulation options, but it can be expensive.

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