Call Now 1.800.265.1914

The Right Way To Approach Attic Insulation

February 02, 2017

Because the attic is out of sight for the most part, homeowners tend to neglect that part of the house when it comes to insulation. But for insulation contractors, the attic is essential for ensuring energy efficiency, reducing energy consumption, and providing seasonal comfort. Utility bills are always on the rise, so homeowners are paying much more attention to home insulation, and becoming more aware of the options for conserving energy and reducing utility bills (heating and air-conditioning).

It's all about sealing, insulating, ventilating

The attic is a unique space that requires effective sealing, high performance insulation, and proper ventilation. All three are necessary because of the air and moisture dynamics of the attic. Therefore, addressing all three will ensure optimum energy efficiency overall. For homeowners with existing attic insulation, things may be adequate, but unless the space is sealed, insulated and ventilated, the "system" can't work efficiently for maximum performance. Ventilation is critical in the attic, and without it, even the best insulation won't perform. A poorly ventilated space will allow moisture to collect, and will assuredly compromise insulation value. In the long term, this could lead to bigger problems, when moisture begins to actually damage the space.

Attic insulation should not be a DIY project

Today, many home improvement centres are promoting DIY options for attic insulation - and that includes sealing, insulating, and ventilating. However, it takes an expert installer to really do the job right. Experts have extensive product knowledge; they have in-depth installation expertise; and they know what to do when it comes to troubleshooting. With a professional install, customers are also assured of reliable warranties for both product and installation. As well, professionals do a comprehensive job from start to finish: they thoroughly inspect the existing condition of the attic; they assess which product or products will best suit the needs; and they decide which installation will deliver the best return on investment for the homeowner.

Product options ideal for attic insulation

One of the more affordable product options for the attic is "blown" insulation. It's "fluffy" in nature, and is designed to restrict air movement, while providing good R-Value. This product is fabricated to be fire-resistant and mould resistant - the ideal for an attic. When professionally installed, the "blown" insulation product is a cost effective option. Probably the best product on the market for attics is spray foam. It delivers more benefits than any comparable product, and it does it in a single application. It blocks out air movement, prevents moisture from collecting, and insulates with very high R-Value. Spray foam envelopes everything in the attic - beams, wiring, plumbing, and ductwork. Some contractors are now recommending a "hybrid" installation for the attic and roof cavity. This approach combines the "blown" insulation product with the spray foam product in one install. Here, the spray foam effectively seals and insulates, and the "blown" insulation adds additional R-Value where required. The "hybrid" approach is extremely cost effective, with excellent long term results.

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!