Mr. Leduc's attic lacked insulation. There was only 6 to 9 inches of cellulose in the attic. Which is equivalent to an R19 value. However, Systèmes Éconergie recommends a value of R60 to ensure a maximum comfort in the house.
Our team replaced the cardboard air vents present in the attic for plastic ones, because the cardboard will decompose in the presence of water and humidity. Then we blew just over 12” of cellulose to achieve an R60 attic value.