How much does it cost to insulate a 2-car garage in Dieppe New Brunswick?

Insulating a standard two-car garage (24x24 feet, approximately 576 square feet of floor space) in Dieppe costs between $2,500 and $5,000 for fibreglass batt insulation with a vapour barrier, or $5,000 to $10,000 for closed-cell spray foam insulation, depending on wall height, ceiling configuration, and whether you include the garage door in the scope.

Let me break down what those numbers include for a typical Dieppe garage. The walls of a 24x24 garage with 9-foot ceilings have roughly 700 to 800 square feet of insulation area after subtracting the overhead door opening, service door, and any windows. The ceiling adds another 576 square feet. Combined, you are looking at approximately 1,200 to 1,400 square feet of surface area to insulate.

Fibreglass batt insulation is the most common and affordable option. For a heated garage in Dieppe, you want R-20 batts in 2x6 walls ($1.50 to $3.00 per square foot installed) and R-32 to R-50 in the ceiling ($2.00 to $4.00 per square foot installed, depending on method). The walls on a two-car garage typically run $1,000 to $2,400, and the ceiling runs $1,100 to $2,300. Add the 6-mil polyethylene vapour barrier on the warm side of the insulation (essential in Dieppe's climate) at $0.50 to $1.00 per square foot installed, and the total for a professionally insulated two-car garage with batts lands at $2,500 to $5,000. If you plan to finish the interior with drywall, that adds another $2,000 to $4,000 for the garage walls and ceiling.

Closed-cell spray foam insulation is the premium option and particularly well-suited to Dieppe's Maritime climate. At $3.50 to $7.00 per square foot for a 2-inch application (roughly R-12 to R-14 per inch), spray foam provides the insulation, air barrier, and vapour barrier all in one application. For a two-car garage, the walls cost $2,500 to $5,500 and the ceiling adds $2,000 to $4,000, bringing the total to $5,000 to $10,000. The higher cost buys you superior air sealing — spray foam fills every crack, gap, and imperfection in the framing, which is especially valuable in older garages where the framing may not be perfectly straight or evenly spaced. In Dieppe's humid Maritime climate, the air sealing properties of spray foam significantly reduce condensation problems inside the wall cavity.

What About DIY to Save Money?

Fibreglass batt insulation is one of the more accessible DIY projects. The materials for a two-car garage — batts, vapour barrier, tape, acoustic sealant, and staples — run roughly $1,000 to $2,000, saving you $1,500 to $3,000 in labour compared to professional installation. The work is straightforward but uncomfortable — wear long sleeves, gloves, goggles, and a dust mask. The critical detail that most DIY installers get wrong is the vapour barrier. It must be continuous and sealed at every seam, penetration, and edge. Every gap, tear, or unsealed joint allows warm moist air to enter the wall cavity where it condenses and causes problems. If you DIY the batts, take extra time and care with the vapour barrier — this is where the job succeeds or fails in NB's climate. Spray foam is not a DIY project; it requires specialized equipment, training, and PPE, and is always professionally installed.

Dieppe sits in the Greater Moncton area with roughly 4,800 heating degree days per year and winter temperatures regularly dropping below -20 degrees Celsius. An insulated two-car garage with a proper vapour barrier and an insulated garage door (R-12 to R-16) can maintain above-freezing temperatures even without heat on most winter days, simply by retaining some warmth from vehicles parked inside. Add a modest heating system and you have a comfortable year-round workshop.

Do not overlook the garage door in your insulation plan. An uninsulated garage door on a 16-foot opening is the single largest thermal weak point — even perfectly insulated walls and ceiling cannot compensate for a thin steel door with no insulation value. An insulated replacement door (R-16) costs $1,800 to $3,500 installed, or a DIY insulation kit for the existing door runs $50 to $150.

For finding insulation contractors in the Dieppe and Greater Moncton area, New Brunswick Garages can match you with professionals for free estimates. Browse local contractors through the New Brunswick Construction Network directory at newbrunswickconstructionnetwork.com.