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Technical Properties of Spray Foam Insulation

February 24, 2015

The term "spray foam insulation" is commonly known throughout the industry as Spray Polyurethane Foam (SPF). During an application, the spray foam product is delivered to the jobsite where it's mixed together according to the manufacturer's product specifications. The mixing process is basically a chemical reaction between compounds, and the result is the formulation of super-thick liquid foam. Using special, customized equipment, the foam is sprayed into a specific space or cavity. With a professional installation, the spray foam is allowed to spread out evenly and uniformly. It expands quickly into place, and then hardens into a dense blanket of insulation that covers the entirety of a space. But the spray foam coverage is much more than a dense layer of insulation. Yes, it insulates the coverage area with high R-Values, but it also provides an impervious air and moisture barrier, precluding the need to install a separate and freestanding vapor barrier. A spray foam application is designed to restrict air movement, thus resisting the transfer of heated air in the winter, and cooled air in the summer. Considering the fact that a residential home can lose up to one-third of its indoor "conditioned" air through leakage, spray foam is simply an ideal application - it effectively seals up a space to prevent air leakage, and it provides the highest possible insulation value of any product available on the market. Whether it's for new construction, renovation, or retrofitting, spray foam creates a continuous barrier that covers and coats everything. It seals up every crack and crevice and adheres to virtually every kind of surface, both even and uneven. With an expert installation, even awkward, hard-to-reach spaces are coated and sealed. There's really no other product on the market that can seal AND insulate in the same way as spray foam. Even a combination of products is hard pressed to compete. Because spray foam involves chemical compounds, the product and application both require experience and expertise. It's a project that's best left to a professional - one with the necessary product knowledge and with proficiency handling the chemicals. As well: safety protocols are required during preparation and application; proper protective gear is required during installation; and worksites must be appropriately prepared. A reliable and reputable installer will be well prepped procedurally. During application, custom equipment is used to apply spray foam. The equipment requires technical competence, as does the installation process. The fact is, a spray foam application should he handled by a professional, and the very notion of a do-it-yourself approach should be discouraged. Considering the uniqueness of the spray foam product and the complexities of installation, a DIY effort would be risky. And the cost of a rework would likely be prohibitive. All things considered, spray foam insulation is the best product of its kind. It seals and insulates better than any other product - there is no need to maintain, replace or replenish - and the application lasts a lifetime. And while the product is known to be somewhat costly, long-term dollar savings far outweigh the initial investment.

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™.


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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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