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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

Southwestern Ontario

7035 Industrial Drive
Comber, Ontario
Canada N0P 1J0

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

GTA East

103 North Port Road
Port Perry, Ontario
Canada L9L 1B2

TOLL FREE: 1-800-265-1914

GTA & 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


259 Campbell Street
Sarnia Ontario
Canada, N7T 2H3

TOLL FREE: 1-800-265-1914

Niagara Region

6260 Don Murie St
Niagara Falls, ON
L2G 0B4

TOLL FREE: 1-800-265-1914


Great Northern Insulation - Better Business Bureau Profile.


Best of 2017

From reputation to responsiveness, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thanks to everyone for the great ratings! 

HomeStars 2018

Best of 2018

For the second year in a row, HomeStars consistently ranks Great Northern Insulation at better than 95% for customer satisfaction. Thank you again to everyone!

Homestars Best of 2019 Award

Best of 2019

For the third year in a row, HomeStars ranked Great Northern Insulation at better than 95% for customer satisfaction.

Homestars Best of 2020 Award

Best of 2020

For four years now, HomeStars has ranked Great Northern Insulation at better than 95% for customer satisfaction.

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

Enenrgy Savers

Energy Saving

Energy saving and energy efficiency is easier than one might think. Great Northern Insulation helps to identify performance issues, while taking advantage of improvement opportunities.

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

WALLTITE® ECO™ is a high-performance system, professionally installed by certified and approved specialists. Its C.C.M.C. approved (Canadian Construction Materials Centre) - with product quality guaranteed - and with installation by highly trained experts with the technical know-how to do the job right, the first time.

Insulthane Extreme

Insulthane® Extreme

For the ultimate in high performance spray foam insulation, Insulthane® Extreme is the professional choice for residential, commercial, and industrial application. With improved thermal performance over other products, Insulthane® Extreme has an exceptionally low Global Warming Potential (GWP). Considered environmentally friendly, this next generation spray foam insulation is non-ozone depleting, and exceeds specifications of other HFC product alternatives.


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).


Baeumler ApprovedTM
Professional, Certified and Insured

Baeumler ApprovedTM gives you peace of mind when connecting with contractors, trades and home service providers. All Baeumler Approved members have demonstrated high quality work for customers and other trade professionals. Members must also have Workers Compensation, liability insurance of at least $1,000,000 and prove professional certification.

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 Energy Conservation Program provides incentives of up to $1,600 to customers who achieve energy efficiency and fuel savings – 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?

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