Calgary runs more refrigerated distribution space than anywhere else in the province, most of it in the northeast around the airport and along the Stoney corridor, and almost all of it is fighting something the rest of Alberta does not get nearly as often. Cold storage spray foam insulation in Calgary has to survive a chinook.
Why a chinook is harder on a cooler than a cold snap
A sustained cold snap is easy for an envelope. The temperature difference is large but it is steady, the vapour drive runs one direction for weeks, and the assembly reaches a state and sits there. A chinook does the opposite. Thirty degrees of swing in a day, several times a winter, means the dew point inside the wall moves back and forth across the same few inches of material. Anything with a seam, a fastener path or a gap gets worked. That cycling, not the depth of the cold, is what pulls a Calgary cooler envelope apart.
Continuity beats thickness here
On a box held at temperature the losses that matter are not through the middle of the panel, they are at the junctions - wall to ceiling, wall to floor, around the door frames, and at every penetration for refrigeration lines and drains. A wall with an excellent R-value and an untreated junction still sweats at the junction. Closed cell spray foam is used on these buildings because it goes on as one continuous layer and carries its own vapour control, so the corner is not a different assembly from the wall.
The retrofit that Calgary asks for most
A great deal of the refrigerated space in this city is converted dry warehouse rather than purpose-built cold storage. Somebody has taken a 1980s tilt-up or a steel-framed unit and put a refrigeration plant in it. Those buildings were designed to keep rain out, not to hold a temperature against a vapour drive, and the original insulation is usually batt in a steel stud wall with a poly sheet that was never continuous. Foam is what makes that shell behave like a cold box without stripping it back to the frame.
Doors and dock seals are part of the envelope
It is common to spend properly on the walls and leave the loading doors as they were. On a busy Calgary DC the doors open hundreds of times a day, and warm humid air that comes in at the dock finds the coldest surface it can. Where that surface is inside the insulation, it condenses inside the insulation. The dock area is worth treating as part of the same job rather than a separate one.
Cold Storage Spray Foam Insulation Calgary: Common Questions
Does a chinook really affect a refrigerated building? More than a cold snap does. It is the repeated swing across the dew point that works an assembly, not the low temperature itself, and Calgary gets that swing more than any other major Alberta city.
Can an existing warehouse be converted properly? Yes, and most of the refrigerated space here started that way. The shell has to be dry and sound before anything is sprayed, and the junctions matter more than the flat wall does.
Does the loading dock need doing at the same time? It usually should be. Warm air arriving at an open door is the largest single moisture load on a busy building, and treating the walls without the dock leaves the problem where the traffic is.
Work out the thickness with the R-value calculator, then get a free Calgary quote. The full picture is on Cold Storage Spray Foam Insulation Alberta.