1.800.265.1914
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Homeowners: Residential Retrofit

For nearly half a century, Great Northern Insulation has helped Ontario homeowners build or retrofit energy efficient, comfortable homes.

Whether you’re looking to replace old or damaged existing attic insulation with new, sustainable cellulose insulation, add highly efficient spray foam insulation to turn a previously unfinished basement into a livable space, or find out what the most environmentally-friendly insulation type for your new addition is, we can help.

For builders and contractors, Great Northern Insulation becomes an extension of your team. With a deep commitment to promoting building code standards today and innovation via PassivHaus and NetZero builds tomorrow, GNI is Ontario's building envelope solutions provider of choice.

Attic Insulation

Attic Insulation

For most homeowners, attic insulation is a home improvement that is very often underestimated.

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Ice Damming Solutions

Ice Damming Solutions

To prevent ice dams, it 
is necessary to prevent roof snow from melting. This is accomplished by stopping heat transfer & air leakage through the attic floor and roof cavity.

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Thermal Barrier

Thermal Barrier

Thermal barriers are designed to delay the temperature rise of spray foam insulation during a fire and to further delay (or even prevent) the spray foam from being engulfed by fire. 

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Fibreglass Batts

Fibreglass Batts

Fibreglass Batts are an extremely common form of insulation made from extremely fine fibres of glass woven together into thick pads.

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Old Insulation Removal

Old Insulation Removal

At Great Northern Insulation, our assessment process will determine if, and to what extent, removal is required. We’ll make it easy to deal with, and with the least encumbrance on your lifestyle.

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Retrofit Drill and Fill

Retrofit Drill and Fill

Experience year-round comfort and energy savings with professional drill and fill insulation from Great Northern Insulation

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 Cottage Insulation

Cottage Insulation

Properly weatherizing a cottage requires a comprehensive approach that includes air sealing and insulating - it’s really the only way to ensure optimum efficiency.

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Air Leakage Testing

Air Leakage Testing

A well sealed home, ventilated correctly, will balance the operation of the HVAC system (heating and cooling) and will noticeably improve the home’s energy efficiency.

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Spray Foam Insulation

Spray Foam Insulation

Spray foam insulation is widely recognized as the most versatile insulating product on the market today.

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 Basement Insulation

Basement Insulation

With Basement Insulation There Are: No More Drafts Or Cold Temperatures, Just A Comfortable Living Space.

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Thermal Imaging

Thermal Imaging

Today, thermal imaging has become an essential component of building diagnostics. Indeed, the extensive data that’s provided exceeds any other diagnostic approach.

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Exterior Insulation

Exterior Insulation

A good contractor provides the homeowner with an INSULATION SYSTEM – a system that maintains proper airflow, effectively manages the movement of moisture and allows for well-balanced ventilation and air circulation.

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The Stack Effect

The Stack Effect

The Stack Effect is a phenomenon that occurs in all types of buildings, but particularly in tall buildings.

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Weatherization

Weatherization

The overall goal of weatherization is to measurably reduce home energy consumption, and thus reduce home energy costs.

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Air Sealing Performance Package

Air Sealing Performance Package

Air sealing is one of the most important aspects of an effective insulation system.

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Client Feedback

GNI took care of everything I needed to have a more comfortable, energy-efficient home

Rating:

star star star star star

Reviewed by:

  Clare

Very professional and courteous. Greeted with a hand shake which is something that doesn’t happen all too often.

Rating:

star star star star star

Reviewed by:

  Aidan

Wow, just wow. First experience with Great Northern and I was and remain impressed with the experience

Rating:

star star star star star

Reviewed by:

  Patricia

GNI took care of arranging the energy audit beforehand so we could get a rebate on the work. The installers were quick, polite, and cleaned up after themselves!

Rating:

star star star star star

Reviewed by:

  Art
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

BBB

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.

Lowes

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 HFO™ 

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.

3M

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

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.

Renomark

Great Northern Insulation proudly abides by a renovation-specific Code of Conduct set by RenoMark™.

eRenovate

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

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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