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Thermal Insulation and Air Barriers are an Energy-Efficiency Priority

August 05, 2017

Every home will experience the dynamics associated with indoor airflow – there’s winter heating, summer air conditioning, even flow-through breezes when the windows are open. For the professionals, airflow is part of a bigger picture, encompassing indoor ventilation, thermal insulation, and air barriers. It’s a big picture because airflow will affect everything – the moisture in the air, the oxygen in the air, and the contaminants found in the air.

Interior airflow throughout a house is managed and maintained by the installed home insulation and air barriers in the building structure. Air barriers are designed to maintain proper airflow between the inside of the house and the outside. And while air barriers are not top-of-mind like home insulation, they are just as essential. Insulation and air barriers work together to ensure performance - the key, of course is an air barrier system that is airtight.

Replacing/upgrading Home Insulation and Air Barriers

When a house is cold in winter, warm in summer, and uncomfortable the rest of the year, it may be time for a remedy. The fact is, effective air sealing and high performance insulation can make things right – balancing indoor comfort season to season; enhancing the overall energy efficiency of the home; and reducing air barriers torontoenergy costs by up to 25% annually. In short, quality insulation and air barriers will serve to improve both energy efficiency and home comfort.

New home or old, there are a variety of reasons to replace or upgrade insulation and air barriers. On inspection, a home may simply have insulation that is deficient. In some cases, insulation may have been improperly installed. In other cases, existing insulation may be damaged or failing. The good news is that upgrading and retrofitting can make for dramatic improvements overall. In fact, improving home insulation is one of the best returns-on-investment.

The Benefits of High Performance Insulation

For optimum energy-efficiency, thermal insulation and air barriers should be working together. This is where spray foam insulation can really perform - it’s an insulator, air barrier, and vapour barrier in one. And when professionally installed, it provides effective airtightness, superior R-Values, and maximum energy-efficiency. Compared with other products and installations, spray foam rises above, with better performance, and a much longer lifespan. 

At Great Northern Insulation, spray foam insulation continues to be the product-of-choice for homes large and small. The benefits of the product make the initial investment very worthwhile.

            •  Heating and cooling costs are measurably reduced annually

            •  Winter heating and summer cooling are far better balanced

            •  HVAC equipment (heat, cool, ventilate) works much better

            •  Air drafts, cold areas, and hot spots are entirely eliminated

Home Energy Solutions from Great Northern Insulation

In Toronto and throughout the GTA, Great Northern Insulation provides professional home energy solutions. Highly qualified installers emphasize every aspect of energy efficiency – from air sealing, to insulation, to ventilation. And with GNI, homeowners are assured of 100% satisfaction. To find out more, call 1-800-265-1914 or visit the company website at www.gni.ca.


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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