In most heated warehouses, they are. A standard dock door is roughly 80 to 100 square feet of opening in an exterior wall, and a building with ten or twenty of them has a lot of surface working against the heating system.

Truck dwell time gets blamed on scheduling, labour, and carriers running late. Those all matter.

Heating a warehouse through a Quebec winter is expensive enough without paying to heat the yard too.

Most of the door and dock failures that show up in January were visible in October.

You likely need a fire-rated door anywhere the building code requires a fire separation, such as stairwells, exit corridors, mechanical rooms, and walls between units or occupancies.