We hired GNI to top-up our main floor attic to an R60 with cellulose blow-in insulation. Right from the beginning it was a very professional and friendly experience. The sales rep, Michael, answered all my questions and went beyond my expectations by even agreeing to wrap my fan duct line with an insulation sleeve that I had purchased. They also installed some baffles to ensure proper ventilation and air circulation, rigid foam boards on the attic hatch and a hatch box wall. It only took about 4 hours for the guys to complete the work and they cleaned up nicely. Top notch company and highly recommend them!!

GNI visited my home 3 times this month, and there were problems all 3 times. Beyond frustrating and disappointing...

1) While removing existing blown-in fiberglass insulation, GNI vacuum hose tore from the waste bag in the disposal bin (they do not use self contained trucks - you have to pay for a rental disposal bin). The result? 1960s attic insulation falling from the sky like snow all around my property and that of my neighbour's.

Clean-up was not complete and not satisfactory. I had to clean up after GNI left.

2) While blowing in R60 cellulose, GNI badly damaged (completely tore off) an attic air conditioning hose that was fully sealed and screwed into the vent which vents into our family room, resulting in the R60 cellulose flowing into our family room. They also totally buried the air handler in insulation, despite being asked to stay clear of the air handler and not get any insulation on it at all.

3) When GNI returned to clear a pathway from the attic air handler to the damaged vent / hose so that the HVAC crew could repair the GNI damage, GNI only completed half of the required work they were hired to do; they only cleared 10 out of the 20 necessary ft.

HVAC crew arrived to repair the GNI damage but were unable to complete the repair, for a second time, because of GNI.

It has also been very difficult to get a hold of GNI office workers for scheduling, etc. Phones often not answered and voicemails often not returned.

We are completing extensive home renovations and have been working with numerous companies (electrical, hvac, general contractor, plumbing, etc) and everyone has been great, except GNI, I am truly disappointed and beyond frustrated with the customer service when trying to address these grievances.

If you go with GNI, I hope you have a better experience.

GNI office staff have refused to provide me with phone numbers or emails of Managers so I am writing this review in hopes that someone at GNI will see it and become aware of these issues so that as a company, they can make the necessary improvements and prevent future headaches and frustration for their clients.

Initial contact from representative was made through email. Everything was straight forward about receiving a quote and set up for payment and the installation date. The guys arrived on time and they presented themselves as polite and professional. They laid down drop cloths to protect the floors. they vacuumed up their workspace before they left. I definitely would refer this company.

We had been having big temperature changes between our main level and our upper level with the upper level much hotter in the summer and much colder in the winter. GNI quoted us a very reasonable price on replacement attic insulation and completed the job within a few days of contacting them. The temperatures are much more consistent with our upper floor much cooler than before. Very satisfied with the results and worth the cost.

If you want to redeem your faith in great and courteous companies.. this is the one..!!

Not only were Derek and Drew 2 of the nicest workman, they take extreme pride in doing things the right way. From start to finish they were courteous, polite, tidy and ensured everything was to our satisfaction.

I recommend this entire team from Lindsay to Angelo,
to Nick, to Derek and Drew we recommend them ALL 100%.

Thank you for a job well done !!

I asked our local contractor about an insulation/ventilation concern in our home. He had a look and advised me to call GNI as in his words, "they are excellent, professional and really know their stuff". So right he was. From very good conversations with the GNI reps in Barrie about what they felt I should and shouldn't do ( yes they actually talked me out of spending money on processes that would not have improved anything ) they came up with an excellent quote. The work was done within a week by a great 2 person crew. Super efficient, they explained the process, and with the aid of drop sheets and personal consideration, once they had finished, you would almost never known they had been here. Basically zero mess.
The entire GNI experience was First Class and would not hesitate to recommend them.

So happy with this service!! Had our basement spray foamed and the Guys who did it were great, fast and super friendly!!
Our basement feels so much warmer already :)

We decided to upgrade the existing insulation in our home. From quotation to completion of the installation I was kept informed and updated as needed. I was very happy with the quotation cost. The installation team were meticulous, tidy, provided protection where needed and cleaned up upon completion. I am very happy with the service. I would be happy to be contacted by potential customers to confirm my recommendation of this company.

Team of 2 came in, took over, prepared the areas, did the work, cleaned up, explained a few things and left. Completely unobtrusive, professional, quick and to the point. Loved it, since my days are usually very busy. This was a no muss, no fuss, great job.

The two reps (Henry and Matt) arrived on time and were appropriately suited up and had masks and gloves on. They were professional and went right to work, explained what they were doing and were good at cleaning up afterwards.