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Does Your Home Need Crawl Space Insulation?

May 21, 2020

Crawl Space insulation is an important part of home comfort and energy efficiency. The crawl space is the area underneath your home that occupies the space between the ground and your first floor. Professionally installed crawl space insulation is capable of making a tremendous improvement to home comfort on every floor of your home. A professional installer can also ensure that your crawl space insulation can help to lower moisture levels, which helps you prevent mould and potential water damage for your home in Ontario.

If you would like to learn more about the benefits of crawl space insulation, or if you would like to start a conversation with us about upgrading your home, please fill out the form below. This will put you in touch with our Customer Experience Team, from whom you can request a free assessment of the current insulation in your home.

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The Myth About Crawl Space Insulation

The unfortunate myth that surrounds crawl space insulation is that it is not necessary for every homeowner - since it is not a climate controlled area. This is untrue. In fact, every homeowner in Ontario could see improvements from having crawl space insulation professionally installed in their home. It can be easy to discredit the benefits of insulating the space beneath your home, since it is an area that is often overlooked due to it not being a livable space, but it is actually capable of helping you improve your home in more ways than one. This is due to the positive effects that strong crawl space insulation has on your home’s building envelope

The Benefits of Professionally Installed Crawl Space Insulation

  • Reduce the spread of crawl space odours
  • Stronger home energy efficiency
  • Improved moisture control that helps prevent mould
  • Warmer floors during the winter
  • Better interior air quality
  • Improved home comfort levels on every floor

Crawl Space Insulation and Your Home Comfort

Your home comfort is directly tied to your home’s level of insulation, air sealing, and energy efficiency. As you improve your home through insulation and air sealing upgrades, you will also notice that your home becomes more comfortable to live in. Your air sealing helps reduce drafts and cold spots, while your crawl space insulation reduces your home’s overall energy loss and improves energy efficiency. This means that every floor of your home stands to see improvements just by having crawl space insulation and / or air sealing professionally installed.

Target the Best Upgrades First with a Home Energy Audit

If you would like to know which areas of your home require the most attention first, GNI will arrange for you to have a whole-home energy audit conducted by a registered energy advisor. This provides you with a complete look into your home’s energy performance, along with a list of upgrade suggestions that are specific to your home and ordered in terms of their cost-effectiveness

Crawl Space Insulation and Your Home Energy Efficiency

As mentioned earlier, even though your home’s crawl space is not climate controlled, it is a part of the building envelope of your home. This is the protective armour that your home’s insulation and air sealing form to keep you separate from the great outdoors. This means that you should consider adding effective air sealing and insulation to your crawl space, in order to maintain strong levels of energy efficiency throughout every season in Ontario. It also means that your home’s energy efficiency is directly tied to the performance levels of your insulation and air sealing.

The stronger that your home’s crawl space insulation and air sealing is, the stronger that your building envelope will be. And the stronger that your building envelope is, the better your home comfort levels and energy efficiency will be. In other words, the building envelope of your entire home is only as strong as its weakest link. So it is important that every part of your home is well protected with effective insulation and air sealing - especially where it is needed most. A home energy audit can help you determine these locations in your household.

Home Air Sealing Starts with an Airtightness Test

To make home air sealing easy, GNI offers airtightness tests to Ontario homeowners. Through an airtightness test, every air leak within your home’s building envelope can be identified and flagged for air sealing. This makes air sealing upgrades easy, and allows you to see how much air is escaping from your home every hour (known as Air Changes per Hour or ACH). An airtightness test is also an important part of helping you prevent mould, since it locates the problem areas of air intrusion and helps identify any spots of potential moisture build up. 

How to Use Spray Foam for Crawl Space Insulation

Spray foam is a common and fantastic choice for crawl space insulation in Ontario. Partly because it has such a strong R-Value per installed inch, but also because it improves air sealing and moisture control all in one. When used as crawl space insulation, spray foam insulation can make a complete air seal that prevents unwanted air transfer between the inside of your building envelope and out. It does this by form fitting to the space that is installed in, which ensures every small air leak or crack is effectively and properly sealed.

With less air leaks and better moisture control, spray foam also helps prevent mould in your crawl space by limiting moisture build up. A GNI insulation consultant can help you address any potential moisture issues that your home’s crawl space might face. This includes helping homeowners with dirt floor crawl spaces manage their higher moisture levels throughout the changing seasons. 

Book an Assessment for Your Home’s Crawl Space Insulation

If you are interested in adding crawl space insulation to your home, GNI can book an assessment to help you see where you stand and what your most optimal next steps could be. A home energy audit is also a pathway to cost-effective home upgrades, as it shows you which upgrades you could make to see the biggest improvements to home comfort and energy efficiency for the lowest possible cost. To get in touch with GNI and book an assessment of your own, please contact us by telephone, or online.


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


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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

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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

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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

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Homestars Best of 2022 Award

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HomeStars has ranked Great Northern Insulation as a company that goes above and beyond in every aspect of business for the year of 2022.


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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

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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.


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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).


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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.


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