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Insulating the Ceiling

December 07, 2015

On the one hand, insulating the ceiling might sound a little excessive - but in fact, there are many benefits. This is particularly true during new construction (when everything is exposed) and in retrofit projects when other insulation work is taking place. As far as the experts are concerned, insulating the ceiling is a cost-effective installation that will ensure energy efficiency in the home, and will dramatically reduce the heating and cooling bills throughout the calendar year. The benefits are many. Heat loss during the winter will be measurably reduced. In summer, cool air will remain within the confines of the home. And quite importantly, indoor temperatures from room to room will be better balanced in summer and in winter. Overall, a good quality insulation product, when professionally installed, will practically guarantee annual savings on the utilities. The total of savings essentially makes the initial project investment a worthwhile endeavor. Home insulation, in general, should be managed professionally. It's a matter of properly assessing the unique needs of the home; it's about choosing the right product for the job; and it's critical that the installation deliver maximum product performance. Insulating the ceiling is much more than just beefing up R-Value. And any good professional will confirm that insulating the ceiling, attic, or roof is about more than just insulation. It's a project worth doing right the first time. Industry professionals focus on some fundamentals when insulating the attic - priorities that set the stage for a complete and comprehensive approach to the project. To begin with, the space must be effectively sealed - this will restrict air movement and prevent unwanted moisture from collecting. For optimum R-Value, the insulation product must be installed according to building code and manufacturer specs. Not to overlook, the space must be appropriately ventilated. Important to remember is that not all ceilings are created equal. In most homes, the attic floor is actually a flat ceiling. However, in some homes there are cathedral ceilings, and in others, there are dropped ceilings. Whatever the ceiling structure, the common denominator with insulation is to stop air leakage, and this would include properly sealing areas like HVAC ducting, conventional vents, and even light fixtures. The truth is, not many insulation products can do all of the above. Today, many professional insulation contractors are recommending Spray Polyurethane Foam as a practical insulation option. For ceiling, roof or attic, SPF envelops a space with an insulation blanket that is multi-purpose - it serves as an air barrier and vapor barrier; it insulates with very high R-Value; and it provides soundproofing at the same time. SPF is the ultimate sealer, coating a space completely - wooden crossbeams; electrical and plumbing; and all of the HVAC ductwork. A good contractor might also suggest a "hybrid" installation for the ceiling. This is a cost effective install that combines Spray Polyurethane Foam with one of the fiberglass insulation products. The products work well together, and when professionally installed will deliver excellent long-term outcomes. The "hybrid" installation assures optimum energy efficiency, lower utility bills, and much improved home comfort.

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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