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Blown In Insulation

March 19, 2015

Blown in insulation is one of many products available on the market today. For the most part, there are two versions - cellulose and fiberglass. Both products are designed for use primarily in the attic and throughout the roof cavity. Once installed, cellulose and fiberglass have similar R-Values (per inch installed), but according to industry statistics, the cellulose blown in insulation has a slightly better R-value than the fibreglass product. On the other hand, cellulose has an inclination to settle over the long term, and this may well have an affect on R-Value. Although similar, each product has its own singular features. However, both products are designed to be fire resistant - the cellulose product is specially treated to retard the spread of fire, while the fiberglass product is difficult to ignite, simply because of its glass fibre content. Clearly, blown in insulation is a desirable product for the attic. In addition, many contractors will suggest "topping up" existing attic insulation with the blown in product, and as long as the existing material is clean and dry, it's a cost-effective solution that delivers added R-Value. In terms of composition, cellulose is made of 100% recycled, shredded newsprint. It is treated to be anti-fungal, and is "fiberized" (separated into fibres) to give it a fluffy composition. The fiberglass product is manufactured from fine glass fibres - a proprietary process designed to give the product its insulating potential. As for the application, cellulose and fiberglass are both blown into a space, hence the name. Special equipment is used to spread the insulation uniformly, and assure complete coverage - even into the smallest, hard-to-reach spaces. For blown in insulation to deliver peak performance, a proper install is essential, and it's preferable to have experience and expertise. A good contractor will do the job right, the first time: suggesting the right product for the job; abiding by construction standards and building codes; and taking into consideration the customer's schedule and budget. Indeed, there may even be extra prep-work that is required - like air sealing or draft proofing; or installing a vapour barrier; or creating additional air vents. It's this kind of comprehensive approach that delivers the best results. There are many project advantages with blown in insulation. Both cellulose and fiberglass provide excellent coverage, filling practically every opening, gap, and crack. Unlike other insulators, blown in insulation blankets a given space completely: wooden crossbeams; electrical wiring; plumbing and pipes; even television cables. Professionals refer to this kind of coverage as a "true insulated building envelope". And for the customer, the benefits are numerous - heating/cooling is better regulated; sound and noise is dampened; and HVAC performance is enhanced. Overall, blown in insulation is a straightforward application that offers excellent insulation value, and affordability for most any budget. As such, a reliable insulation contractor can provide a full service approach under one roof - they will have extensive product knowledge; provide dependable product availability; and will deliver the technical expertise that ensures peak product performance and an installation that is guaranteed for the long term.

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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