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For Optimum Performance A Toronto Building Needs Exterior Insulation

May 12, 2017

exterior insulation home renovation torontoIn every building structure, regardless of size, heat flows naturally from an area that is warm to an area that is cooler. In winter, heat from the warm indoors will flow out to the cold outdoors. Needless to say, that happens through the exterior walls of a building. In summer, warm air from the outdoors will flow into the cooler indoor space. In a typical house, energy experts estimate that exterior walls (depending on exterior insulation) can account for some 20% of heat transfer. It's hard to imagine what 20% heat transfer means, but bottom line, it's wasted heating, wasted cooling, and wasted money. In years gone by, a residential home had very little, if any, insulation inside the exterior walls. There was little awareness of energy efficiency, and in most cases, attic insulation did the job of insulating the home. Not that anyone would notice, but heat loss in the winter and heat infiltration in the summer was substantial. At the time, this was not so costly.

Today, with the high cost of utilities in Toronto, and far more focus on energy efficiency, exterior insulation makes economic sense. Simply put, stopping heat transfer (heat loss) translates into less energy being used and therefore a reduction in utility bills every season. Installing exterior insulation can actually improve a home's energy efficiency quite dramatically. And while most homeowners suffice with attic and basement insulation, insulating exterior walls can make a big difference. Done professionally, exterior insulation can be effectively installed over an existing surface. Here, spray foam has proven to be extremely effective - a high-performance application that provides an air barrier, vapour barrier, and insulation envelope all at the same time. Using other insulation approaches will not be as effective as spray foam, mainly because of the potential for air loss and the lack of moisture control.

With spray foam, total sealing of the "building structure" is assured. Because spray foam seals and insulates simultaneously, R-Values are also maximized, allowing for better thermal performance in summer and winter. In fact, the substantial dollar savings on utilities can realistically offset the original investment of installing the exterior insulation. It may take a number of years, but the cost-benefit of insulating the exterior walls is well worthwhile. The important thing is to do it right, with seasoned installers who have experience and expertise. With spray foam insulation, it's not appropriate to look for price discounts or special deals. This is work for professional contractors who are trained and skilled with the product. Spray foam professionals follow the building code, install to the manufacturer specifications, and don't take any shortcuts. Their aim is to do it right the first time, and deliver insulation performance for the long term. Anything short may well compromise overall energy efficiency of the home. In Toronto, homeowners can count on Great Northern Insulation for quality exterior insulation. To arrange for a FREE in-home assessment, visit the company website at www.gni.ca or call toll free 1-888-778-9591.

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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