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Can Spray Foam Insulation Decrease the Danger of Mold?

October 21, 2015

Most everyone realizes that a mold infiltration in a home or building can cause health problems. That includes everything from mild symptoms like sneezing and coughing to more serious issues like lung damage. Beyond the health risks for occupants, removal and remediation of mold is both stressful and costly. Worst of all, mold is sneaky, and oftentimes the spread can't even be seen. Inside a home, the dynamic interaction of warm and cool air can result in unwanted moisture collection - especially in places like the attic and basement. Moisture is the breeding ground for mold, and building materials provide the required nutrition for mold growth. In short, once mold starts to develop, the home is actually under attack. Clearly, prevention is key to avoidance. Most every residential home suffers from air leakage - it allows warm air and cool air to mix and create moisture. Preventing this means creating an airtight seal throughout the attic, basement and other parts of the home. Simply put, totally sealing a space prevents moisture accumulation, which then robs mold of a comfortable environment to live in, to grow in, and to spread out. Spray foam insulation (referred to as polyurethane spray foam insulation) is the only product of its kind than can completely seal a space. Once applied, every hole, gap and crack is completely sealed. And in the attic, nothing can compare with the envelope of insulation that is installed with spray foam. Sealing the attic is probably the most critical, in terms of counteracting moisture. As a product, spray foam insulation does not attract mold. And unlike wood or metal, spray foam does not rot, rust or deteriorate. This means that an area properly sprayed with foam insulation will never become a food source or a hospitable environment for a mold colony. As a result, spray foam has become an ideal installation option for spaces like the attic, basement, and garage. Given that spray foam insulation is an exceptional sealing agent, its still only part of the solution. Proper ventilation, especially in an attic, will assure appropriate air circulation to avert moisture accumulation. And depending on the home, this may include roof vents; soffit vents; even exhaust fans. The whole idea is to combine airtightness and air circulation in a well-balanced system. Clearly, spray foam insulation does much more than just insulate. It will control indoor humidity and condensation, and therefore prevent mold from growing and spreading. It will allow for a more balanced operation of the HVAC system in the home, and will save considerably on seasonal heating and cooling costs. Best of all, the threat and danger of mold is forever avoided. More and more, mold-consulting firms are noticing that when spray foam insulation is installed, the area remains unaffected by mold. This includes the high-risk areas like the attic, basement, and any awkward crawlspaces. It's no wonder that for the team at Great Northern Insulation, spray foam insulation has become a preferred option, and continues to be highly recommended.

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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