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Attic Insulation Is Cost Worthy And Cost Effective

March 20, 2017

Because most attics are easy to access, homeowners find this area of the home very cost-effective to insulate. Even in an attic that is already insulated, there plenty of potential to improve and enhance overall energy efficiency. In fact, even if the only upgrade is air sealing, this will make a dramatic difference. A well-sealed attic will prevent heat loss and stop moisture accumulation. Both elements will contribute to long-term energy efficiency as well as added indoor comfort. For professional insulation contractors, air sealing is integral to the performance of any installed insulation. The problem in the attic is that every little gap allows for undesirable air movement - the plumbing pipes; the ceiling light fixtures; the HVAC ducting; even the various exhaust fans. Without effective air sealing, warm indoor air will escape from the attic in winter. Similarly, warm outdoor air will intrude into the home through the attic during the summer months. Today, many professionals are recommending spray foam as the ideal application for the attic. This product will seal every little hole in the attic, while performing as an insulating barrier at the same time. It's also possible to install spray foam in conjunction with other insulation products, something that an expert contractor can recommend. Whatever the final approach, spray foam requires the experience of a professional contractor who understands this unique product. Other than spray foam, the other two product approaches for the attic are fiberglass batts and loose-fill insulation. Each has their own benefits, and can often be used in combination, especially in an attic space that has many irregular and hard-to-reach spaces. Here again, a professional install is recommended, as these products need to be strategically installed to ensure maximum performance. A DIY weekend project will not yield the same outcomes as an expert installer. Beyond insulation, attics and roof cavities require appropriate ventilation. This can be effectively achieved with soffit vents, ridge vents, and baffles - but without, insulation performance will be compromised. Often underestimated, attic ventilation is essential in managing air moisture in the summer and winter. Poor ventilation will assuredly cause problems throughout a frigid winter and during a sweltering summer. In short, sealing, insulation, and ventilation work in tandem. One of the benefits of contracting an insulation professional for the attic is having the work done right from the start. Structural issues are evaluated; moisture problems are addressed; and air leakage is assessed. More than that, upgrades and retrofits are recommended in order to resolve problem areas and deliver maximum energy efficiency once the project is complete. Professionals know what to look for and can reliably offer the product and installation that best suits the need. For homeowners who plan to re-insulate the attic space, it's important to know whether existing materials need to be removed before proceeding. Once again, it's the experts who can determine whether existing insulation is performing, deteriorating, or simply inadequate. In addition, a comprehensive assessment will set the stage for the most effective solutions to be implemented.

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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