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The Essentials of Exterior Insulation

September 11, 2015

As most homeowners already know, heat flows from a warm space to a cool space - it's natural. In the winter, heat has a tendency to flow from the heated indoor spaces to the outdoors - and that happens right through the walls. On the other hand, in the summer, heat has a tendency to flow from the outdoors to the interior of the home. This constant airflow (and heat transfer) is what points to the essentials of exterior insulation. Traditionally, residential home insulation was installed between the interior wall-studs. There was very little or no exterior insulation to speak of. It meant that there was plenty of leftover space that lacked insulation - and that meant that even the installed insulation didn't perform to its max. Where insulation did not effectively insulate, the potential for heat loss (referred to by experts as thermal bridging) was quite substantial. Exterior insulation is about preventing heat loss. And in a residential home there are so many opportunities throughout for heat to escape. The lack of exterior insulation not only contributes to heat loss - it also reduces the insulating effectiveness of existing insulation. For the professionals in the industry, augmenting exterior insulation is a sure-fire way to significantly impact existing R-Values, while providing additional R-Value. For today's energy conscious homeowner, exterior insulation is one of the better home-improvement projects, especially for those who want to dramatically reduce energy bills. Its because exterior insulation can cover 100% of the wall surface, leaving no gaps for air to flow back and forth, and therefore reducing heat loss, cool loss, and energy loss. Better still, exterior insulation will contribute to substantial seasonal utility savings. One of the many benefits of exterior insulation is that it can be installed over virtually any existing surface material. And depending on the product used, it's an excellent chance to address the condition of the "substrate" and to start from scratch. While there are countless insulation products on the market, and many contractors with the "answer", spray foam insulation is one application that has delivered proven results in many exterior insulation projects. It's a high-performance product, an all-in-one system, and a superior application that performs beyond other insulation products. For exterior insulation, it provides an airtight seal, an effective vapor barrier, and 100% coverage. When installed, conventional exterior insulation products often suffer from partial air loss or poor moisture control. These are not issues for spray foam insulation, and there are no spaces, shapes or edges that are too difficult to cover, seal or insulate. In fact, for the best long-term exterior insulation performance, spray foam is the preferred application. And beyond anything else, it offers the highest R-Value insulation per inch of any product. For the residential homeowner or commercial building owner, exterior insulation using a spray foam product will deliver the results - reduced energy usage and lower utility bills.

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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