The steel only has to hold a box. The box has to hold its temperature, hold its air, and keep its vapour on the warm side. We build the box; the refrigeration contractor lands on it.
A cold room is judged in the second winter, by a thermometer and an electricity bill. That is decided by joints, not by tonnage.
Sized not just for the roof but for what hangs under it: ceiling-suspended evaporators, air coolers, pipe runs and the access a service engineer needs above the panel.
Cam-locked insulated panels, thickness set by the temperature you must hold and the climate outside — not by whatever size happens to be in stock. Floors, ceilings and walls in the same system.
Continuous, taped and sealed, on the warm face. Every joint, corner and fixing is a detail with a specified seal, because vapour does not respect a bead of mastic applied in a hurry.
Insulation under the slab, and a heated threshold at the door so the ground under it does not freeze, lift and crack the floor you paid for.
Door frames, pipe runs, defrost drains and cable trays. Each one is located on the model and sleeved before the panel is cut, so the hole is sealed by design rather than by silicone.
Equipment weights, hanger positions and service clearance are asked for at the start, because they land on our steel. A frame designed without them is a frame that will be modified on site.
None of these is expensive. All of them are impossible to fix after the panels are locked together.
Whether rooms are separate boxes or share a wall decides the panel build-up, the door type and where the vapour barrier runs.
Insulation, slab, and the frost heater at the threshold. Get the floor wrong and the problem appears at the door, two winters later.
Traffic, opening time, air curtain, strip curtain, and whether a forklift will hit it. The door is the weakest element and the one everybody visits.
A pipe through a panel is a hole in a barrier. Every one needs a sleeve, a seal and a position on the drawing before the panel exists.
Water leaves the room warm and must not freeze on the way out. The fall, the trap and the heat are decided with the layout.
Frame, panel, refrigeration and floor are four contractors. One of them has to own the drawing where they meet, and that is written into the contract, not discussed on site.
Room temperatures, traffic and the products going in. From those three we can tell you what the envelope has to be, and what it will cost you to run.
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HONGJI SHUNDA