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Bad Insulation Can Actually Make You Sick!

September 19, 2016

Bad insulation can have negative consequences on the health and wellbeing of homeowners, even without warning. But beyond health, there's also personal comfort to consider. The thing is, a coldish, dampish indoor environment is both uncomfortable and unhealthy. In some cases, it may be that insulation was poorly installed. In other cases, existing insulation may have settled over the years, and simply become inefficient. There are also situations where insulation product was just not right for job - inefficient and with little effect. Whatever the situation, and without a viable remedy, bad insulation will compromise the indoor environment of a home, and negatively affect occupant comfort. By any measure, a cold home is an unhealthy home. This is mainly because indoor coldness promotes dampness in the air, and condensation - both of which encourage the growth of mold. It's no wonder that these conditions can potentially lead to sinus colds, allergies, and other respiratory ailments. Bad home insulation, especially in cold winter regions, requires resolution. Inefficient insulation also means higher-than-usual energy costs. This applies equally to heating the home in winter and cooling the home in summer. And because heating and cooling accounts for over 50% of home energy consumption, bad insulation and air leakage are just a prescription for wasted energy and wasted money. The fact is, a poorly insulated house is also a poorly sealed house, and that makes for heating and cooling that easily escapes through roofs, ceilings, walls, and floors. It's bad for occupant wellbeing and budget. Overall, well-insulated homes are energy-efficient homes. They are more comfortable in summer and winter, more healthful for occupants, and contribute to reduced energy costs throughout the year. Well insulated also means well sealed - an airtight house actually allows insulation to better perform. As well, the airtightness enhances energy efficiency so that HVAC performance is better balanced. All in all, the indoor environment, whether in winter or summer, is improved - winter is warm and dry, and summer is cool and comfortable. As a remedy for bad insulation, one of the better options is Spray Foam Insulation. It has become popular amongst homeowners and professionals because it performs so well. SFI inhibits air movement and "heat loss" - it's an all-in-one air barrier, vapour barrier, and insulator. And since it stops moisture from accumulating, homeowners benefit from less dampness and condensation inside the home. Winter and summer, a home insulated with Spray Foam Insulation will result in a more comfortable, healthier indoor environment. Importantly, when choosing to install Spray Foam Insulation, homeowners should always opt for a professional approach. The insulation material requires proper handling; the manufacturer's specifications must be followed; and building codes must be respected. An expert installation is the way to ensure optimum product performance - and a reliable insulation company will do just that. Best of all, Spray Foam Insulation lasts a lifetime. There's no need to replenish or replace, the investment "payback" is reasonable - between two and seven years.

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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