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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

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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