https://reddit.com/link/1t6rwar/video/7lc13fgbzszg1/player
We recently topped up the attic insulation in this Pickering hope as part of a large interior remodel. We opted to remove the existing insulation in the back half of the house as were completely changing the layout on the 2nd floor and there was extensive electrical work to be done inside the attic.
After all the work in the attic was complete I had my insulation contractor come and blow in cellulose insulation to achieve an R60 rating throughout the whole attic. (approx 1500 sq ft) He also sealed the truss pockets with batt insulation and installed baffles for proper airflow.
The insulation bill came to $3300 which works out to about $2.20 per square foot. Hopefully this helps someone planning a renovation, or who might be thinking about topping up their attic!