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When It Comes To Home Insulation In Toronto, It's Important To Effectively Seal Air Leaks

June 09, 2017

To ensure the optimum in home energy efficiency, industry experts agree that insulation and air sealing are both key components. Hard to believe, but in most homes, some 30% of heating and air conditioning is wasted because of air leakage in the "building envelope". For homeowners interested in improving home insulation in Toronto, it's also important to seal air leaks at the same time. This would include addressing air leakage in the roof, the attic, and the basement - all areas that contribute to significant air leakage. Even in a newly built home, there are zones of air leakage that can be problematic. Contractors who provide home insulation in Toronto will also want to seal air leaks in order to ensure the least amount of air leakage. Home energy professionals agree that proper air sealing provides much added value to an insulation project - it's the best return-on-investment when working to improve home energy efficiency. The fact is, a home that is well sealed and well insulated can save hundreds of dollars a year in utility costs. After a few years, an energy-efficient home can save enough on heating and air conditioning to offset the cost of the original project work. When it comes to home insulation in Toronto, the added effort to seal air leaks will make a big difference in any retrofit. A properly sealed space has measurable benefits: overall insulation performance is improved; energy efficiency is enhanced throughout the home; and the HVAC system performs better. The important thing is to have all of the work expedited professionally. Beyond installing (or re-installing) home insulation in Toronto, the added work to seal air leaks shouldn't be underestimated. The thing is, when the "building envelope" is effectively sealed, the entire indoor environment is improved. Indoor comfort is enhanced. Air circulation is better balanced. And indoor air quality is healthier. As well, an effectively sealed home will ensure that circulating air moisture is better controlled. And along with proper indoor ventilation, the entire living environment is much more comfortable.

The most effective home insulation and air seal combination

When recommending home insulation in Toronto, many industry professionals are suggesting spray foam insulation to insulate and seal air leaks at one time. This application creates a more effective airtight space than any other product combination. It's particularly effective in the attic and basement, where there are many hard-to-reach spaces. The spray foam application also eliminates the need for a separate freestanding vapour barrier because the foam envelope actually restricts the circulation of air moisture. At Great Northern Insulation, installers are highly experienced with spray foam. Homeowners can rely on top quality products and superior installations. Every project, regardless of size, is installed to code, and customer satisfaction is guaranteed on every job. To arrange for a FREE home energy assessment in Toronto, contact the professionals at Great Northern Insulation by calling toll free at 1-888-778-9591, or visiting the company website at www.gni.ca.

Western Ontario

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Canada N4V 1C3

Phone: 1-800-265-1914

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M9V 4K6

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Niagara Region

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L2P 2C7

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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™.


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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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