Garage insulation cuts energy bills and street noise. Here’s how to insulate your garage door.

 

Garage door insulation can make your life warmer, cooler, and quieter. It lowers energy bills, acts as a barrier between you and street noise, and brightens an otherwise dreary space.

Garage door insulation is an easy DIY project; it’ll cost you about $200 to insulate two 9-foot-wide doors.

Types of Insulation

Any insulation type will increase the energy efficiency of your garage door. Here are the most popular types to apply to the back of garage doors:

  • Batt insulation. This flexible insulation, often found stuffed into exterior walls, is commonly made of fiberglass. It’s usually backed by paper or foil, which act as vapor and air barriers. Insulating values are R-3 to R-4 per inch of thickness. Cost is about 30 cents per square foot.
  • Foam board insulation. These rigid panels, typically made from polystyrene, provide a high insulating value for relatively little thickness. Panels most often range from 1/2 inch thick (R-3.3) to 1 inch (R-6.5). Foam board often is faced with aluminum or vinyl. ($20 for a 4-foot-by-8-foot sheet that’s 1 inch thick.)
  • Reflective insulation. Rigid boards and rolls of reflective insulation have highly reflective aluminum foil applied to one or both sides of insulation materials, such as cardboard and polyethylene bubbles. This type of insulation reflects radiant heat, making it a good insulation choice for garages that heat up in summer or hot climates. Its approximate R-value is 3.5 to 6, depending on the way you apply it. (A 4-foot-by-25-foot roll is $42).