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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

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

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

GTA East

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

TOLL FREE: 1-800-265-1914

GTA & 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


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914

Niagara Region

6260 Don Murie St
Niagara Falls, ON
L2G 0B4

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!

Homestars Best of 2019 Award

Best of 2019

For the third year in a row, HomeStars ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2020 Award

Best of 2020

For four years now, HomeStars has ranked Great Northern Insulation at better than 95% for customer satisfaction.

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

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

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

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


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).


Baeumler ApprovedTM
Professional, Certified and Insured

Baeumler ApprovedTM gives you peace of mind when connecting with contractors, trades and home service providers. All Baeumler Approved members have demonstrated high quality work for customers and other trade professionals. Members must also have Workers Compensation, liability insurance of at least $1,000,000 and prove professional certification.

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 Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – 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?

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