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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

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

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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


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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

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

Homestars Best of 2021 Award

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Homestars Best of 2022 Award

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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

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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.

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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).


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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.


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