Insulation is a key component to maintaining a comfortable indoor temperature and supporting energy efficiency. It’s available in a wide range of forms and different types are designed for use in various areas of your home or building. Whether it’s attic insulation or wall insulation, there are several factors that influence the type you choose and how much of your home it will cover.

In general, it’s more cost-effective to add attic insulation than wall insulation. However, the best approach depends on your local climate, the dimensions of your attic space and whether or not you want to remove drywall. In addition, if there’s any mechanical equipment in the attic or knob-and-tube wiring, you’ll need to have those components addressed first.

Wall vs Attic Insulation: Which One Should You Prioritize?

Upgrading your attic’s insulation prevents heat from escaping upward, thereby keeping living spaces warm in winter and cool in summer. It also helps minimize how hard your heating and cooling systems have to work.

While wall insulation is less expensive than attic insulation, it can still be a significant investment for many homeowners. It’s important to weigh your options carefully and to speak with a certified insulation installer before making any decisions.

If your attic and walls are insulated but your home feels drafty or too hot, wall insulation may be the right choice for you. It’s particularly effective for homes built over unheated garages, in basements, and in heated rooms above ground level. It reduces noise between interior rooms and is a great option for bathrooms and home offices.

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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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