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Ottawa Concorde Apartments


Ontario has an aging residential infrastructure problem.

In August 2018, a high-rise residential apartment building in Toronto caught fire, leaving nearly 1,500 residents without a home for over a year while the building underwent repairs. The fire, which occurred in an electrical room, devastated the aging infrastructure and caused extensive damage to the building and its electrical components.

The story of this Toronto high-rise fire is significant not only because of the difficulties and harm caused by displacing so many people from their homes, but also because of the conversation and potential political action it spurred regarding Ontario’s aging residential infrastructure. Ontario contains tens of thousands of high-rise residential apartment buildings, a majority of which were constructed between the 1950’s to late 1970’s. At a glance, high-rise units make perfect sense; they are a housing solution that provides high population density with a low urban geographic footprint. As these buildings continue to age, though, they require more and more upkeep and funding to keep each building running, comfortable, and profitable. Today, many of these older buildings are experiencing infrastructure failure or require full replacement for vital building infrastructure such as boilers, windows, elevators, and electrical systems.

In 2019 a Bill was tabled that would amend the Residential Tenancies Act of 2006. One of these amendments would require landlords of residential complexes of 10 or more residential units to maintain a financial account where, each month, a prescribed percentage of all rents would be deposited. This fund would be used only for repairs to the complex to combat aging residential infrastructure. The Bill, known as the St. James Town Act, was tabled by MPP Suze Morrison, whose riding includes the St. James Town community where the August 2018 fires left almost 1,500 without a home for over a year.

“This winter, other high-rise buildings in St. James Town experienced floods and electrical shutdowns.  Some buildings were without heat, water, or electricity for several days during some of the coldest days this winter.” Suze Morrison said when announcing the St. James Town Act to the media.

While a building fire is an extreme – but very real – potential circumstance of aging residential high-rise infrastructure, many of the other points mentioned by Suze Morrison are far more common. An overarching contributing factor to many of these issues is air leakage within a building, primarily caused by aging, worn, or completely missing air sealing measures. Over time, the built-in air sealing within windows, doors, and around other air leakage pathways becomes ineffective and must be replaced to avoid excess stress on mechanical systems, decreased building energy efficiency, and increased number of tenant complaints in regard to overall comfort or drafty conditions.

While the St. James Town Act has not yet been passed, it showcases the need and desire for ongoing improvements to Ontario's high-rise residential building infrastructure. Unlike other potential infrastructure repair costs, improvements made to building air sealing measures can result in large improvements with a comparatively minor overall cost.

With over 40 years of experience, Great Northern Insulation has carried out building envelope infrastructure improvements to many high-rise residential buildings. The Concorde apartments in Ottawa are one such building, where Great Northern Insulation carried out a complete air sealing upgrade package to replace weatherstripping on all suite windows, caulk units with siliconized latex caulking, install commercial-grade weatherstripping on all stairwell doors, garbage chute doors, and exterior doors, and air seal penetrations in mechanical suites using proper firestop materials. In this Featured Project article, we will briefly explain each of these upgrades, and the benefits they provide to both tenants and the building itself.

In December of 2019 GNI completed a comprehensive air sealing package to our 15-storey apartment building in Ottawa. The building was over 40 years old with original windows and balcony doors. All the weatherstripping was replaced with new commercial grade stock to reduce drafts and energy consumption. The reduction in gas consumption was noticeable, even though we had switched our MUA unit to 100% in March 2020 due to COVID-19. Our tenants were also pleased with the results, commenting on reduction in drafts and sound transmission from outside. I feel this was a worthwhile project which will definitely show a return on investment.

- Steve Goldberg, P.Eng
Director, Construction & Property Standards
Realstar Management

Left: Existing, aged weatherstripping to be replaced. Middle: A cleaned window frame with aged weatherstripping removed. Right: New commercial-grade weatherstripping installed.

Window Weatherstripping Upgrades

As weatherstripping on windows wears down and ages, it allows for conditioned air to leave or external air to infiltrate the unit. It’s important to monitor the quality of window weatherstripping for signs that it may need to be replaced, as air exfiltration or infiltration means decreased overall comfort, higher energy costs for consistent indoor temperatures, and reduced tenant satisfaction. Replacing weatherstripping within every unit of a high-rise residential building can be a daunting task, but the overall time commitment and can be drastically reduced by hiring a professional company to complete the task.

Like window weatherstripping, existing caulking measures can degrade and wear over time, leaving gaps and cracks that allow for air leakage pathways. New caulking works in tandem alongside improved weatherstripping and can be installed at the same time to reduce not only the amount of time required to complete the upgrades but the time required inside each unit, as well.

Top: A stairwell door without door sweep installed. Bottom: After installation of commercial-grade door sweep.

Weatherstripping Doors

Stack Effect occurs in all types of buildings, but particularly in taller ones. It is a phenomenon that happens when natural air enters the lower floors of a building, flows throughout, and exits through the uppermost floors. This effect causes air leakage issues, increased condensation, and compromised air quality. Left unattended, these issues can escalate with the age of the building and cause major headaches for property managers.

Equipping stairwell and external doors with new, commercial-grade weatherstripping helps to alleviate the stack effect, reducing the overall impact on the building HVAC systems and improving overall comfort by stabilizing internal temperatures. In addition to these external and stairwell doors, Great Northern Insulation also installed new weatherstripping on garbage chute room doors in order to minimize odours that were otherwise able to waft into hallways and occupied units.

Air Sealing Mechanical Penetrations

In air sealing or fire stop terms, a penetration is an opening in a wall or floor, usually for an electrical, mechanical, or structural item that passes through. These penetrants can include pipes, electrical conduits, ductwork, and many other items. Closing these pathways around the item with proper air sealing methods is vital in reducing air leakage pathways throughout a building. In certain cases, fire stop materials may be used to ensure that, in the case of a fire, the opening will not allow smoke or fire to pass through to other areas of the building.

Proper building envelope and insulation upkeep of residential high-rise buildings in Ontario is a task that requires a professional assessment. Contacting Great Northern Insulation, as the Concorde apartments in Ottawa did, to conduct an assessment is the first step in obtaining a specific, strategic plan in increasing the energy efficiency and lifespan of mechanical components and HVAC systems within your building. Carrying out air sealing upgrades is a great way to improve tenant occupancy and retention, reduce overall heating and cooling costs, and counteract the aging high-rise residential infrastructure problems that are occurring throughout the province.

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

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

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

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

GTA & 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


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914

Niagara Region

6260 Don Murie St
Niagara Falls, ON
L2G 0B4

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!

Homestars Best of 2019 Award

Best of 2019

For the third year in a row, HomeStars ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2020 Award

Best of 2020

For four years now, HomeStars has ranked Great Northern Insulation at better than 95% for customer satisfaction.

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

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

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

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


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

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 Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – 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?

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