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Advantages of Insulating Your Garage

June 16, 2016

For most homeowners, a home insulation project does not typically include insulating the garage. Not surprisingly, the average person does not recognize the garage as a "thermal boundary". But for the professionals at Great Northern Insulation, the garage space is actually a "boundary" that separates the outdoor air (unconditioned air) from the indoor air (conditioned air). Bottom line, for a residential home that comes with an attached garage, insulating the garage is important. Many homeowners start thinking about garage insulation when there's a finished living space on top. In fact, it's not uncommon for that living space to be overly hot in summer, and overly cold in winter. Essentially, it means that the garage is not a good "thermal boundary". Without a well-insulated garage, the space is neither airtight nor thermally protected. And because every garage allows for air leakage, the living space above the garage is affected, as is the rest of the house. An attached garage is part of the overall building "envelope". It should therefore be treated like the rest of the house - with proper air-sealing and proper insulation. Insulating the garage is actually worthwhile - basically, the space will be kept warm during the winter and cool during the summer. Depending on the amount and extent of the insulation, the now-improved "thermal boundary" should enhance the energy efficiency of the home, and provide energy savings as well. In general, any amount of garage insulation is going to be better than none at all. And while there may be budget considerations, it's not worth doing a half job - half jobs or quick fixes will only set the stage for additional repairs or retrofits in the future. Here, it would be good to have some professional advice - including what product to install and which installation method to employ. And although a DIY approach might save some money, the results can't compare with an expert. Whatever insulation product is chosen, insulating the garage will provide homeowner benefits. For one, the insulated space will be comfortably warm in winter, especially for those who make regular use of the garage space. As well, an insulated garage will prevent air-conditioned air from leaking out of the house in summer. Finally, when an attached garage is properly insulated, that living space above becomes more comfortable throughout the year, both winter and summer. For the professionals at Great Northern Insulation, one of the better approaches to insulating the garage is to include the under-side of the ceiling. This type of installation will greatly increase the R-Value of the space, and will assure optimum thermal insulation for the living area above the garage. Always acting as a "thermal boundary", a properly insulated garage does a lot: air leakage is stopped; moisture collection is prevented; and R-Values provide better energy efficiency. While some homeowners might opt for the DIY approach, garage insulation really requires some expertise. Professionals understand the different products and installations, and can suggest the best approach, based on the physical properties of the garage and home. Best of all, products and installations are guaranteed, and homeowners are assured of long-term performance.

Western Ontario

935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3

Phone: 1-800-265-1914

Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914

Muskoka, Haliburton, Northern Ontario

1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1

TOLL FREE: 1-800-265-1914

Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

TOLL FREE: 1-800-265-1914

Greater Toronto Area

2 Guided Court
Etobicoke, ON
M9V 4K6

TOLL FREE: 1-800-265-1914

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

South Central Ontario

450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6

TOLL FREE: 1-800-265-1914

Eastern Ontario

1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

TOLL FREE: 1-800-265-1914

Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.

Homestars Best of 2021 Award

Best of 2021

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2021.

Homestars Best of 2022 Award

Best of 2022

HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


GNI is the Authorized & Trusted Insulation and Air Sealing Installer for Lowe’s

Trusted for Over 40 Years

Over 40 Years in Business

At GNI, we service your project with the most experienced staff in the industry. Ongoing professional development is an obsession at GNI and we will not compromise at any level to bring to our customers the very best Installers, Sales Representatives, Customer Care Personnel, Field Superintendents, Estimating and Technical Support to your project.

100% Canadian

100% Canadian

Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.

Foam Masters

Do it right the first time
- with foam mastersTM

January, 2021 regulatory phaseout of hydrofluorocarbons (HFCs) with the introduction of WALLTITE CM01. Using hydrofluorolefins (HFOs) with lower global warming potential (GWP) compared to HFCs, WALLTITE CM01 is the next generation of spray foam insulation.



Heatlok® Soya HFOTM leverages Honeywell’s latest Solstice® Liquid Blowing Agent technology. This new hydrofluoroolefin (HFO) blowing agent is the most environmentally conscious blowing agent produced to date, with a zero ozone depletion potential (ODP) and a global warming potential (GWP) of 1, which is more than two orders of magnitude (99.9%) lower than HFCs used in this industry.


3MTM products.
Quality + Performance = Savings

3MTM energy-saving products are designed to keep warm air in, and cold air out, while keeping energy bills down. Products optimize energy efficiency in buildings and homes; improve indoor environment for occupants; and effect the reduction of seasonal energy costs. 3M products are authorized for LEED credits (Leadership in Energy/Environmental Design).

Holmes and Holmes

Holmes and Holmes


Mike Holmes and his son Mike Jr. (MJ) convert MJ’s bachelor bungalow into a two-storey home for MJ and his girlfriend Lisa. Choosing the newest materials and build techniques, the father and son team follow Mike’s famous motto – “Make it right.” The show can be watched on HGTV and DIY Network.


Enbridge Incentives

The Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – and Great Northern Insulation can pave the way.


Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.


We are Verified & Bonded by eRenovate. When you choose to proceed with our services through their platform, you receive the gaurantees set forth through their program.

As Seen on Love It or List It

The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?

Climatizer Cellulose


CLIMATIZER PLUS cellulose insulation is manufactured from a minimum of 85% locally-sourced post-consumer recycled newsprint. Non-toxic additives are applied to the uniquely fiberized paper generating a building material with superior thermal and acoustic properties, as well as exceptional resistance to fire, moisture, mould and pests.

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