Call Now 1.800.265.1914

Yes - There is a Best Way to Insulate the Attic

March 22, 2016

Easy, fast, and affordable is not always the best approach. This is especially relevant with home insulation, and specifically true about attic insulation. And while the Internet is full of insulation pros and cons, there really is a best way to insulate the attic - Spray Polyurethane Foam. There is no shortage of discussion and debate about the various insulation products available today, and as always, every brand manufacturer has the best product available, and with the best outcomes. But in recent years, Spray Polyurethane Foam has emerged as the go-to product for professionals throughout the industry. The products are unique (and complex) and installation requires a high level of experience and expertise. But for a professional installer, nothing quite beats SPF - there are no other products on the market that can deliver comparable benefits with one application. And the one major benefit is sealing - nothing seals a space like the attic like the SPF product. Spray Polyurethane Foam seals a space completely, and creates a vapor barrier and air barrier at the same time. This serves to eliminate air movement and prevent moisture accumulation. And in the attic, both air and moisture will compromise insulation - something that just counters the whole purpose of insulating. With proper ventilation installed throughout the attic, SPF is the most effective insulation money can buy. But importantly, it requires a professional install. A Spray Polyurethane Foam installation is not for the DIY enthusiast. Even with a DIY kit and an in-store workshop, the products and application require the expertise of a trained installer. Good contractors always follow the manufacturer's specifications; observe the local bylaws; and above all, install to code. This is the only way to ensure optimal performance for the final installation. As well, inadequate DIY installations can set the stage for re-works and re-installs that are costly. For the average homeowner, SPF is a costly home improvement - more so than other insulation methods. And while its deemed as the best, it's still considered a premium product. Because of this, contractors are offering a more cost-effective approach that installs SPF along with another compatible insulation product. With this method, SPF is applied first in order to seal the space. Right after, loose fill insulation (many prefer cellulose) is installed to complete the project. In most of Canada, and in the northern parts of the USA, there are national standards for R-Value, particularly for newly built homes. Once again, whether its Spray Polyurethane Foam or a hybrid approach using a compatible product, there is nothing that comes close to the short term and long term product performance. Even with cost considerations, the yearly savings on heating and cooling will offset the original project investment. The cost benefit makes economic sense. The big question is whether there's a bad insulation product. The answer: probably not. But there is such a thing as the best product, and that's Spray Polyurethane Foam. There's also such a thing as a bad installation, and hence, the best approach with any product is the professional approach.

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.

Please, enter a valid value

Incorrect values!