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How to Prepare Your Attic for Professional Insulation

June 29, 2016

Like any home improvement project, home insulation requires proper planning and preparation. And because insulation work can be involved, planning is even more relevant. Many homeowners are tempted to try a do-it-yourself approach with home insulation. And while there are savings to be had, there are more reasons to seek professional expertise than not. At the same time, doing the necessary homework will make for better homeowner decisions during the life of the project. When one considers the extent of work involved with home insulation, it's clear that professional experience is required. In the attic, for example, there may be a need to remove aging insulation (perhaps even deteriorated materials). There may also be a need for various repairs. And in most cases, there will be a need to air-seal the space effectively. Finally, to complete the job, ventilation will have to be enhanced or re-installed. In short, this is all well beyond the average homeowner. Professional insulation contractors will rarely install new insulation without air-sealing a space like the attic. With so much heat and air conditioning escaping through openings in the attic, air sealing is an absolute must. In fact, insulation without air sealing could be considered a waste of money. The same applies to attic ventilation - attics (and roof cavities) need to breathe, so that moisture-laden air doesn't accumulate and compromise the effectiveness of the new insulation. Air sealing or ventilation - both require expertise in designing and installation. Once again, a DIY approach can potentially cause more problems down the line. This is "building science" and does actually require a professional touch. The thing is, air sealing, insulation and ventilation comprise a "system" - everything has to work in sync. Products must be installed to the manufacturer's specifications, so that the "system" delivers the maximum in energy efficiencies for the long term. Whether it's preparing the attic for insulating, choosing the right product for the job, or the actual installation, there are many moving pieces. And beyond expertise, there's equipment required, specialty tools, and protective gear. With Great Northern Insulation, homeowners can be assured that a project like attic insulation is managed professionally from start to finish. GNI does it all under one roof - energy assessments; insulation removal; quality products; and superior installs. With Great Northern Insulation, homeowners benefit from decades of home insulation expertise. GNI ensures customer satisfaction with high quality products and manufacturer warranties that provide reassurance for years. GNI installers are the best in the business - they are highly trained; install everything to code; and follow the manufacturer's product specifications. Workmanship is guaranteed, and any post-installation issues are handled expeditiously, to ensure satisfaction. Today, many home improvement centres are touting the DIY approach, along with products and equipment to do the work. While it's true that cost savings are appealing, a professional approach is the one that will deliver the best overall results. Expertly managed and professionally installed, quality insulation can deliver substantial cost savings on utilities throughout the year.

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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