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For a Major Insulation Project - Consult a Professional!

March 19, 2016

The truth is, regardless of the scope of a home insulation project, it's far better to work with a professional contractor than not. And when it comes to a major project, working with a professional is just fundamental. In most cases, unless the home is a new build, insulating a home is a retrofit project - it requires planning and execution that is best managed by those with experience. Retrofits require a good understanding of pre-existing conditions, potential problem areas, and preventive measures that will avoid worst-case scenarios. Without doubt, an insulation retrofit will greatly improve energy efficiency, while providing home comfort and significant savings on monthly utility bills. The big question is how much to do? And for professional insulation contractor everything starts with improving the airtightness of the "building envelope". This is considered to be the most cost-effective element when insulating a home. And while every project will have limitations on the scope of work, even basic improvements to airtightness will deliver positive results. For some homeowners, a major insulation retrofit makes economic sense and fits into the budget. Here, a number of project options are possible, each with potential challenges, but each with potentials payoffs.

  • exterior insulation - retrofitting the overall "building envelope"
  • topping-up insulation - throughout the roof and/or attic cavity
  • above-grade walls - installation of new air and moisture barrier
  • below-grade walls - foundation walls insulation and finishing
  • basement floor - air barrier plus vapor barrier plus insulation
  • interior walls - air/vapor barrier plus insulation (if possible)
  • attached garage - insulating garage walls adjacent to the home

When it comes to project costs and budgets, a cost-benefit assessment is extremely helpful when doing an insulation retrofit. Along with an expert contractor, the scope of the project can be better defined, and the potential benefits can be easily determined. For example, there are countless benefits to installing insulation while other home renovations are in the works. Other than a newly built home, this is the best opportunity to air-seal and insulate a home - and indeed, an opportunity to capitalize on combined cost savings. With any major insulation project, there are also potential challenges that may emerge. Here again, working with professionals is valuable - they will consider any pre-existing conditions in the workspace; they will be aware of potential side effects after the retrofit; and they will understand the performance dynamics of the home's HVAC system post-retrofit. Most importantly, a professional contractor knows how to troubleshoot, and how to provide viable solutions where problems arise. This is clearly not the right time for a DIY job. One aspect of home insulation that's too often overlooked is ventilation. On one hand, the building envelope has to be airtight - on the other hand, properly installed ventilation has be an integral part of the "system". This will ensure optimum air circulation throughout the home, and will prevent moisture from collecting and causing other potential problems. Proper ventilation will also improve HVAC performance in winter and summer, while improving indoor comfort and air quality.

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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