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How Does Heat Insulation Trap Heat?

November 24, 2015

For many homeowners, the scenario is familiar - sitting in the living room in winter, feeling chilly, and bumping up the heat. It does the job in the short term, but it's not productive and it's far from efficient. The better scenario is to provide the home with proper heat insulation, and in fact, the more heat insulation, the better. There is far less energy loss, there is more comfort, and fuel bills are reduced. The good news is that heat insulation can do it all "under one roof". Without getting overly technical, heat can travel, and it can escape from the home in a variety of ways. The professionals refer to this as "heat flow", and for the majority of homeowners it's not desirable. A typical home experiences heat loss from the doors and windows; the roof and attic; even the walls and floors. And heat insulation is designed to trap heat, prevent it from escaping, and thus keep the indoor environment warm and cozy throughout the winter. The scenario for the "chilly" homeowner is simple: indoor heat escapes; it gets cold inside; the heat gets bumped up; and the utility bills rise. It's totally counterproductive, and it's clearly more preferable to provide appropriate heat insulation. One of the best things about home insulation is that it pays for itself. Even with a hefty, upfront project cost, the utility savings (during the winter months and summer months) will easily pay down the original investment. Heat insulation is designed specifically to stop heat from escaping. And with so many options for heat to escape, homeowners must prioritize where heat insulation will best serve the home.

  • The attic is known to be a primary source for heat loss. Heat insulation will ensure that the space is sealed and airtight. And along with the appropriate ventilation, the home will benefit from both energy efficiency and comfort.
  • For interior and exterior walls, a custom "drill and fill" technique provides heat insulation to insulate the wall cavities. This technique (installed from inside or outside the home) provides much enhanced levels of insulation.
  • Heat insulation in the basement is one of the most effective. A product like spray foam serves as an insulating envelope, air barrier, and vapour barrier all at once. It's a "system" that ensures both comfort and utility savings.
  • For attached garages, heat insulation will prevent heat loss from the house itself, as well as a "bonus room" located above the garage. Here again, spray foam insulation can provide seasonal comfort and annual savings.
  • Beyond the more conventional applications, heat insulation also includes draft proofing. With the right products and installations, draft proofing provides worthwhile benefits throughout the home, and noticeable savings.

Whatever the insulation product or the installation technique, a heat insulation project should be done right the first time. It's a home improvement project that will deliver more benefits than other, more cosmetic, home projects. Best of all, the annual savings on heating and cooling costs will quickly "pay down" the initial project 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
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Canada P1P 1R1

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Central Ontario

29 Ferndale Industrial Drive
Barrie, Ontario
Canada L4N 9V5

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2 Guided Court
Etobicoke, ON
M9V 4K6

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GTA East

103 North Port Road
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Canada L9L 1B2

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South Central Ontario

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Toronto (Milton), Ontario
Canada L9T 5A6

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1035 Moodie Dr #1,
Nepean, ON
K2R 1H4

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Niagara Region

25 Lincoln Ave
St. Catharines, ON
L2P 2C7

TOLL FREE: 1-800-265-1914


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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 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

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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

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.


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The Home Efficiency Rebate Plus program offers up to $10,000 in home reno rebates – and Great Northern Insulation can pave the way.


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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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