Call Now 1.800.265.1914

Why an Air Tightness Test is So Important

September 26, 2016

Whether building a new home, or installing new insulation, air tightness is key to performance. In most cases, professionals acknowledge this fact, and further recognize the importance of an air tightness test. The bigger issue, it seems, is how best to insulate a space, and pass an air tightness test without question. This is why traditional options for air sealing are being reconsidered. Beyond conventional installations that attempt to ensure air tightness, product manufacturers are regularly introducing new approaches. As architects, engineers and insulation professionals recognize the significance of an air barrier (and vapour barrier) in construction, various product systems are gaining in popularity - systems that insulate, air seal, and moisture seal in one shot. Today, an increasing number of engineers and builders are specifying Spray Foam Insulation for residential application. Whether the installation is for attics, roofs, or walls, the idea is to create a continuous air barrier system that simplifies new construction or retrofitting. In short, Spray Foam Insulation will effectively consolidate insulation, air sealing, and moisture deterrence. Once Spray Foam Insulation has been applied, there's far more confidence when having a house air tested, and far more certainty that prescribed air tightness targets will be attained. For the professionals, a commitment to airtight building construction sets the stage for future industry objectives - those objectives being to ensure "airtight construction" in every residential home. Indeed, Spray Foam Insulation has many benefits that derive from an airtight space. Heating and cooling cycles are better balanced; energy efficiency is much enhanced; and energy consumption is reduced throughout the seasons. For the homeowner, this translates into cost savings around the year, and allows for a reasonable "payback period" on the original project investment. For the average property owner, an airtight home might also qualify for various rebate programs that are available from local utility companies and municipalities. With significant cash-backs, the cost of an insulation retrofit can be quite easily offset. The idea is to have an energy assessment (with airtightness test) before work is done, and finish with an assessment after work is done. Once a property owner has accommodated the requisites of a rebate program, insulation work can commence, using a professional contractor who will ensure that the retrofit will handily pass an airtightness test, particularly after the Energy Advisor executes the final assessment at the end of the project. In most regions of the country, this is a win-win option for any homeowner. Future trends dictate that energy efficiency will be primary in every home. There will be no place for energy wastage, and many more government regulations will define minimum requirements for an air tight space and high performance insulation. Residential homeowners would be wise to stay ahead of the trends, do some relevant homework, and start retrofitting for the future. Importantly, and particularly with Spray Foam Insulation, an installation should be performed by a professional - an expert who understands the nuances of the insulation product, and the unique aspects of the installation. These types of projects aren't well suited for a "quick-fix".

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.

Please, enter a valid value

Incorrect values!