Great Northern Insulation

1.0 (3 reviews)

Insulation Installation, Fire Protection Services

Closed • 6:30 am - 5:00 pm

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Services - Great Northern Insulation

Insulation installation

Fire protection services

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Great Northern Insulation - Panel and cladding. - Insulation Installation Near Me - Gravenhurst, Ontario

Great Northern Insulation - Attic insulation and removal. - Insulation Installation Near Me - Gravenhurst, Ontario

Great Northern Insulation - Hybrid system insulation. - Insulation Installation Near Me - Gravenhurst, Ontario

Great Northern Insulation - Fireproofing. - Insulation Installation Near Me - Gravenhurst, Ontario

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Josh S.

4 years ago

I thought I had made a good choice in moving ahead with GNI for a hybrid attic installation on my home. Nope--it turned out to be the worst experience I've personally had from any contractor that has worked on my home over the last 13 years of home ownership. Below is my honest account of some (not all) of the low-lights of this experience. 1.) the install was scheduled to take only 3 days to complete but ultimately spanned over approximately 11 calendar days, causing significant and unnecessary disruption to my family 2.) disorganization and poor internal communication led to incorrect foam type being installed in the corners of my attic. I had to spend considerable effort to advocate for this to be addressed and resolved. GNI needed to return to remediate to prevent future mold issues. 3.) GNI labourers needed to borrow basic tools from me because they either didn't have them, or theirs were broken. 4.) there was poor preparation work done to properly protect my refinished hardwood flooring. Had to purchase and setup my own flooring protection This relatively simple installation was an awful experience from the very start and right through until the very end. GNI acknowledged these issues by offering a discount of approximately 7.7% in an attempt to make up for the experience and to cover the additional materials I needed to purchase. While the items in the scope of work were eventually delivered, I feel this discount is not sufficient given the amount of unexpected disruption and chaos that my family needlessly experienced. read more

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Vick C.

4 years ago

This is a really bad company to do your insulation. They blown insulation in my attic, and completely covered the breathing vents. Now Moisture has build up in the attic and gathering mould. I made countless calls to the company, and they keep giving me the run around, "someone will get back to me within 3 to 5 business days.... etc". No one ever came. I feel like launching a complaint with the ministry of consumers affairs!! read more

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Lukas W.

7 years ago

After weather stripping the door, it doesn't shut solid, only by the deadlock. Pipes sprayed without tucking them in and rim joists were not sprayed either. They are very hard to get a hold of and even slower to come and correct their mistakes. Never again. read more

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More info about Great Northern Insulation

1027 Jones Road
Gravenhurst, ON P1P 1R1
Canada
Directions
(800) 265-1914
Call Now
Visit Website
http://www.gni.ca

From the Business

Specialties

Your home or cottage should be comfortable in every season. We are committed to your comfort. Retrofits & New Construction - Spray Foam Insulation - Attic Insulation - Basement Insulation - Fireproofing - Air Sealing - Drill and Fill

History

Established in 1980.

36 years ago, Great Northern Insulation began serving Southern Ontario offering spray foam insulation, blown-in attic insulation, and sprayed-in-place acoustic and fireproofing fibres. Today, Great Northern Insulation has grown to serve all of Ontario providing an even wider variety of insulation and weatherization services.

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Dyson Alarm Tech Systems

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Amazing company,…read more Technicians are all certified, did not even know this was a requirement. Now I would know to ask. Great service, quality is a 10 The whole group of installers and techs are very knowledgeable and they are all certified

From the owner: With almost 40 years in the industry Dyson Alarm Tech Systems specializes in fire and life safety…read moreproducts and inspections; security alarm installation and monitoring; security camera installation and service; intercom system installation and service and much more!

FC Fire Prevention

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i had a very great experience from the beginning. They answered all my questions and concerns and…read morewere so professional. I would definitely recommend these guys they have a lot of knowledge and know their job very well.

From the owner: At FC Fire Prevention in Toronto, we are dedicated to keeping you safe and protected. With our team…read moreof experienced professionals, we provide top-notch fire prevention services tailored to your specific needs. From fire alarm system installation to regular inspections and maintenance, we ensure that your property is equipped with the highest level of fire safety measures. Our commitment to excellence, attention to detail, and exceptional customer service sets us apart. Trust FC Fire Prevention to safeguard your property and provide you with peace of mind. Contact us today to experience the difference of our reliable and comprehensive fire prevention solutions.

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I've been working with Security Fire & Life Safety for a while now and haven't had anything but…read moreprofessional quality with polite service. I couldn't recommend them enough.

NorthGuard Insulation

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NorthGuard Spray Foam did an amazing job on our cottage. With them it brought our insulation up to…read morecode at an affordable price. They were quick, clean, and professional. I would highly Recommend them to anyone!

From the owner: Unleash the Power of Efficiency with NorthGuard Spray Foam Systems…read more Are you tired of fluctuating energy bills and uncomfortable indoor temperatures? Look no further! NorthGuard Spray Foam Systems is here to revolutionize the way you think about insulation. Say goodbye to energy waste and hello to savings! Our state-of-the-art spray foam insulation forms a seamless barrier, providing maximum thermal efficiency. Keep your space cooler in summer and warmer in winter while reducing your carbon footprint. Whether you're renovating your home, constructing a new building, or working on a commercial/industrial/agricultural project, NorthGuard Spray Foam Systems has the expertise to tailor our spray foam insulation to your specific needs. From attics to basements, walls to roofs, we've got you covered. Enjoy long-term savings with our spray foam insulation. The initial investment pays off quickly through reduced energy costs, making it a smart and eco-friendly choice for the budget-conscious. Our skilled technicians ensure a hassle-free installation process. We understand your time is valuable, so we work efficiently without compromising on quality. Experience the convenience of a swift transformation with NorthGuard Spray Foam Systems

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8 reviews that are not currently recommended

The reviews below are not factored into the business's overall star rating.

Dave D.

7 years ago

Great professional service, Chris and Greg showed up as scheduled went right to work laying the plastic vapour barrier. With the type of cribbing under the house it turned out to be very time consuming. They finished the vapour barrier but ran out of time to spray the foam. They returned the next day which was Saturday to complete the job otherwise G.N.I. was totally booked, they had no idea at what date they could return to finish. Job completed amazing workmanship,attention to detail. Top notch service from start to finish from sales to completion. I highly recommend G.N.I. Dave D. read more

Dan D.

9 years ago

I just had Great Northern insulate a cottage I am building. They gave me a comprehensive quote and followed up with a preliminary assessment visit. They made an appointment for the work to be done and then completed the work on schedule. The office was very courteous and followed up on any questions or concerns that I had. read more

Kathy A.

7 years ago

Wow! Does it ever pay to go with the experts. I've never seen a place so wrapped up for coziness. Great attention to detail. From start to finish, these guys were professional, communicative, and even handled some problem-solving to help us get our cottage turned from seasonal to four season. Well worth the investment. read more

Darlene O.

9 years ago

We were very pleased with the workmanship and professionalism of the employees insulation crews showed up on time very courteous and very knowledgeable what the job would have to be performed after they finished the job they cleaned up left no mess and now we are benefiting from the job with lower heating costs. read more

Dylan D.

9 years ago

The GNI team were prompt and provided clear and reasonable written estimate in a very timely manner. They were easy to schedule an installation date, and showed up as scheduled. Their customer service team friendly and promptly resolved all of our concerns read more

Chuck K.

9 years ago

Great service and support from GNI. From the front office, to the consultant, to the folks who actually did the work. This company know why they're doing and does it right. Very thick spray foam insulation in Haliburton for a Bunkie. read more

Alicia B.

8 years ago

Great service by the territory rep and the workers who came to spray. Nice guys! Very polite. Quick and clean. Can't beat the price!

Nick S.

9 years ago

Did a great job on my shipping container cottage conversion.

Great Northern Insulation - insulationinstallation - Updated July 2026

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Great Northern Insulation

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8 Great Northern Insulation reviews that are not currently recommended

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8 reviews that are not currently recommended

Great Northern Insulation - insulationinstallation - Updated July 2026

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