935 Keyes Drive,

Woodstock, ON

N4V 1C3 See our website for branches across Ontario


Phone: 1-800-265-1914

info@gni.ca


Company website

Great Northern Insulation

Great Northern Insulation is an industry leading insulation installer with over 28 years experience. We are the largest insulation company in Ontario and have branches throughout.

We specialize in air tight sprayed in place BASF Walltite® polyurethane foam insulation endorsed by Mike Holmes. We also install batt, rigid-boardstock and blown-in loose fill insulations. We are Energy Star certified and take pride in exceeding Energy Star requirements.

Our mission is to provide effective solutions to air leakage and heat loss problems in residential, cottage, commercial, industrial and agricultural buildings for both new and retrofit construction in Ontario.

Please visit our website for further information on our products and services.


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