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And you won’t find another company that does it better. GNI is the industry leader in precision spray foam application and Canada’s largest purchaser of spray foam insulation. Our in-depth knowledge comes from over 40 years of experience with application, innovation, and working with leading manufacturers to field test new product offerings.
GNI installers are certified applicators for a wide range of specialized products and whole-building solutions, and are fully trained, licensed and certified in spray foam application. Everything we sell and install is covered by warranty and products we use are from sound, reputable manufacturers. Our installation teams are insured and covered by WSIB.
Using special equipment, highly-trained installers spray the compound in a thick liquid form. It expands into the coverage area and quickly hardens into a thick, dense layer.
Properly installed spray foam insulation creates a continuous air and vapour barrier that fills cracks and crevices to ensure complete coverage, which makes it an ideal choice for retrofit work. It has a high R-value per inch and is available in a variety of densities to fit every application. Not only does it insulate well, it adds structural strength. And an application lasts a lifetime and is not likely to need replacement or replenishment during the life of the building.
Spray foam increases energy efficiency, reduces heating and cooling costs, curtails air and moisture movement to allow for better air circulation, and can even boost the resale value of the building.
Get in touch with a GNI Commercial Sales Rep to learn more about the benefits of expertly-installed spray foam insulation for your business.
935 Keyes Drive
Woodstock, Ontario
Canada N4V 1C3
Phone: 1-800-265-1914
Fax: (519) 539-7946
TOLL FREE: 1-800-265-1914
1027 Elwell Park Road
Gravenhurst, Ontario
Canada P1P 1R1
TOLL FREE: 1-800-265-1914
29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5
TOLL FREE: 1-800-265-1914
2 Guided Court
Etobicoke, ON
M9V 4K6
TOLL FREE: 1-800-265-1914
103 North Port Road
Port Perry, Ontario
Canada L9L 1B2
TOLL FREE: 1-800-265-1914
450 Industrial Dr,
Toronto (Milton), Ontario
Canada L9T 5A6
TOLL FREE: 1-800-265-1914
1035 Moodie Dr #1,
Nepean, ON
K2R 1H4
TOLL FREE: 1-800-265-1914
25 Lincoln Ave
St. Catharines, ON
L2P 2C7
TOLL FREE: 1-800-265-1914
Great Northern Insulation - Better Business Bureau Profile.
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.
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
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
Great Northern Insulation is recognized as Canada's largest full-service insulation contractor. GNI is 100% Canadian owned, proudly serving Ontario customers since 1980.
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.
Huntsman HEATLOK® SOYA HFO™
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).
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
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.
The GNI crew have been featured installing insulation on Love It or List It - have you seen our logo in an episode?
Climatizer
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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