Call Now1.800.265.1914

Exterior Insulation In Residential Homes

February 17, 2017

The basics of insulation dictate that heat will flow from a warm area to a cool area. In wintertime, heat will flow from the warm indoors to the cold outdoors - and that happens through exterior walls of the home. On the flipside, in summertime, outdoor heat will flow into the home. Exterior walls can actually account for 20% of heat transfer in a typical house. And if that sounds like a lot, it is - it translates into wasted energy, wasted heating and cooling, and wasted money. Years ago, residential homes had little or no insulation in the exterior walls. There wasn't much focus on energy consumption, and for the most part, attic insulation did an adequate job in terms of insulating the home. Heat loss in winter was quite substantial, and heat infiltration in summer was quite common. Today, the idea of exterior insulation makes much sense, primarily because preventing heat loss means using less energy, making for reduced utility bills year-round. In a typical residential "building structure", heat transfer will also compromise the effectiveness of any existing insulation. In rectifying this, the home's overall energy efficiency can be improved dramatically with exterior wall insulation. For most homeowners, attics and basements will take preference over other parts of the home when it comes to home insulation. But in fact, insulating the exterior walls is one of the best home-improvement projects in terms of cost-benefit. Done right, exterior wall insulation can be installed over any surface. Here, spray foam insulation has proven to deliver exceptional results. As a high-performance product, spray foam is viewed as an "all-in-one" application that provides an air barrier, vapour barrier, and thermal insulation with a single installation. The more conventional insulation products cannot compare with spray foam, because they suffer from partial air loss and less than optimal moisture control. With spray foam insulation (whether in the attic or in exterior walls), the "building structure" is sealed tight. And because it seals and insulates at one time, spray foam also delivers the most R-Value per inch of any comparable product. All of this translates into measurably improved energy efficiency for the entire home, and reduced energy use around the year. Indeed, the dollar savings over the years will serve to offset the investment that was made in the original project. For professional installers, it's important to recommend the right product and installation for the job. Professionals have the product knowledge and technical know-how to deliver performance results, particularly with spray foam insulation. These products are uniquely different, requiring specialized equipment and substantial installation expertise. Simply put, spray foam isn't suitable as a weekend do-it-yourself undertaking - it's best left in the hands of those with experience. With home insulation, it's not the right time to look for bargains. A reliable insulation contractor will do it right the first time, with installers who are appropriately trained, and with reputable product warrantees. Spray foam professionals install according to the building code, without taking unnecessary construction shortcuts. Their objective is to deliver long term performance.

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.


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.


Gold Certification promise

GREENGUARD® Gold Certification ensures the strictest criteria for low-level chemical emissions. Certified products are safe for individuals with sensitivities (children/elderly) and safe for use in school environments and health-care facilities. The product certification is widely recognized by the LEED Rating System (Leadership in Energy/Environmental Design).

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.


Multi-attribute product certification

ECOLOGOTM is an accredited sign of environmental performance – holistic – green – sustainable - and compliant with strict, third party standards. Life cycle criteria for product certification may include manufacturing and operations; health and environment; product materials and performance; and product innovation, development, and management.


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.

Please, enter a valid value

Incorrect values!