What type of insulation is best for a garage?

What type of insulation is best for a garage?

Last Updated on March 20, 2024 by Saira Farman

When you plan to heat your garages, insulation is a good idea. When it comes to durability, you may use the same insulation as the rest of the house.

But depending on whether the garage is finished, some may be better than many others. It would be best if you insulate the garage door. Therefore, which needs multiple installations than ceiling and walls.

Garage Insulation Basics

If you’re installing a garage heater, it’s good to insulate it, whether permanently or temporarily. It’s useless to have protection when you’re not adding heat. Insulation enhances warmth, despite what people think. Insulation, in reality, only slows heat transfer through the insulating barrier (wall, ceiling, or floor), which is beneficial in both hot and cold conditions.

Insulating unheated garages attached to the house, according to some, may provide an increased thermal buffer between the home’s surface and the outdoors. However, no state requires that the entire garage be insulating as part of power requirements. 2 It’s also doubtful that these minor improvements in energy transfer will cover the cost of adding considerable insulation.

It’s essential to think about where the insulating will go when selecting insulating for your garages. The garage door would require a different insulating than the ceilings and walls. You’ll also have to consider whether your garage walls are completed or incomplete.

Whether you need insulating to cover a complete wall or ceiling or only fill in gaps and voids. Budget, simplicity of installation if you’re doing it yourself and whether you want an environmentally friendly alternative are all factors to consider for garage insulation.

1.     Fiberglass Insulation

Fibreglass is the most prevalent type of best insulation for garages (and the most common type in homes). Precut bats and long blankets that fit walls and ceilings joists are available. You may also obtain loose-fill fibreglass, perfect for blowing into an unfinished garages attic space.

Use paper-faced or encapsulated fibreglass bats encased in a plastic film if the walls and ceiling remain available (not covered with drywall or plywood). However, these will give the walls a little more polished appearance. Therefore, the unpleasant insulation fibres will no longer be accessible and ready to catch dust.


  • Simple to handle
  • Simple to frame
  • Low cost


  • Fibreglass irritates the skin, eyes, and lungs
  • Moisture prone
  • Fire hazard if you put it wrong

2.     Rigid Foam Insulation

Rigid foam is available in 4-by-8-foot sheets with thicknesses ranging from 1/2-inch to 4-inch. The most popular materials are expanded polystyrene (similar to Styrofoam), extruded polystyrene, and polyisocyanurate. However, the rigid foam has a high R-value per inch of diameter and can be moulded to fit virtually any space. Therefore, it’s an excellent solution for insulating garage doors and thin walls.


  • R-value is high
  • Effective noise reduction
  • Low-cost option


  • When it comes to wiring and pipes, cut-to-fit installations might be complicated.
  • Insects and pests can tunnel through.
  • Possibility of being overly airtight and failing to meet air-venting regulations

3.     Spray Foam Insulation

Spray foam is excellent for R-value and air insulation (beyond the low-expanding canned product). As with most garage projects, spray foam may be overkill because it is a high-end material generally utilized for energy-efficient development. However, it might seem like you’re making the garage into a living space.


  • Creates an airtight seal
  • Ideal for small rooms
  • Insect and mould resistance
  • R-value is high


  • Costly
  • Professional installation is recommended.
  • Expansion can be excessive or insufficient.
  • Possibility of shrinking as it ages

 Final Verdict:

Insulating garages is one of the most effective ways to control the temperature in your home better. They also save money on electricity. Spray foam is the most excellent type of garage insulating because it provides the finest air sealing, power efficiency, stability, lifespan, and R-value.

However, various insulation choices are available, and not all of them are created equal. Therefore, Spray Foam Insulation Edina MN to assist you; we’ll go over the most popular insulation methods and suggest the greatest one.

Read More: The benefits of insulting a garage door