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Most cool room installations do not fail because someone joined a panel badly. They fail because the slab was 15mm out, the door was hung on the wrong wall, or nobody thought about where the condensate drain would go until the room was already up.
This guide walks through a cool room installation the way it actually happens on an Australian site — what to get right before the first panel goes up, the order the room goes together, and the mistakes that cost real money to undo.
A cool room installation is mostly preparation. The panels go up fast once the groundwork is right.
Before anything: the three things that decide your install
1. The slab must be level — genuinely level
This is the one that catches people. A cool room is a rigid box. If the slab falls away even 10–15mm across the footprint, the walls lean, the corner joins gap, and the door will not seal — and a door that does not seal is a room that never holds temperature and a compressor that never stops.
Check before you order, not after. Run a level across the full footprint in both directions and diagonally. If it is out, pack and level the floor first, or plan for a floor panel to take up the difference. Fixing this after the room is standing means pulling it apart.
Mark the footprint and check level in both directions before the first panel arrives.
2. Decide the door swing and position now
The door is the only part of the room you cannot easily move later, and it drives everything else: which wall panel gets cut, where the wall studs land, and how people actually work. Think about the trolley path, not just the doorway. A door that opens into a bench or forces a three-point turn with a loaded trolley will annoy someone every single day for ten years.
3. Work out where the condensate goes
Every refrigerated room makes water. That water has to leave the room, run somewhere legal, and not freeze on the way. Sort the drain route and the condensing unit position before the room goes up — retrofitting a drain line through a finished panel wall is ugly and it breaks the thermal envelope.
The install order
A cool room goes together in one direction. Get the sequence wrong and you will be dismantling to fix it.
Step 1
Set out and start in a corner
Mark your footprint on the slab. Always start from a corner and work outward — it is the only way to keep the room square. Fix your floor channel or bottom track to the line.
Step 2
Stand the wall panels
Stand the first corner panel plumb and brace it. Every subsequent panel locks into the last. Check plumb every third panel — small errors compound, and by panel ten a 2mm lean is a 20mm gap.
Step 3
Engage the cam-locks
Z-lock panels pull together with a hex key through the access port. Draw them up firm and even. If a join is not closing, the problem is almost always plumb or a burr — not the lock. Do not force it.
Step 4
Hang the door frame
Fit the door frame into the prepared opening while you still have access. Check the seal contacts evenly all the way around before you move on. A door adjusted now takes minutes; adjusted later, it takes a day.
Step 5
Ceiling panels last
Ceiling goes on once the walls are square, plumb and locked. Support it properly — ceiling panels span between walls and any hangers, and the span depends on panel thickness and load.
Step 6
Seal, flash and finish
Silicone every internal join, fit coving to the floor junction, flash externally. This is what makes the room airtight. Air leaks are where efficiency dies.
For the joining detail itself, see our step-by-step guide: How to Join Coolroom Panels (Z-Lock).
Choosing panel thickness before you install
Thickness is decided at order time, not install time — and changing your mind later means new panels. Match it to the temperature you need to hold:
Compare in detail: 35mm vs 50mm vs 75mm · Panel cost calculator
Five mistakes that cost the most to fix
1. Building on an unlevel slab. Everything downstream inherits the error. The door is where it shows up, and by then the room is together.
2. Not checking plumb as you go. Panel one being 2mm out is invisible. Panel twelve being 24mm out is a rebuild.
3. Forcing a cam-lock that will not close. The lock is telling you something is misaligned. Force it and you deform the join permanently.
4. Skipping the internal sealing. The panels are insulated; the joins are not, until you seal them. Unsealed joins sweat, then rot out the floor junction.
5. Leaving the drain and condenser as an afterthought. Cutting services into a finished room breaks the envelope you just paid for.
DIY or installer?
Plenty of cool rooms in Australia are DIY installs and they go fine. Panels are light, cam-locks need one hex key, and two people can stand a small room in a day.
Where you want a professional is the refrigeration. Panel work is carpentry-adjacent; connecting and commissioning the plant is licensed work. A common and sensible split: install the shell yourself, then have a licensed refrigeration mechanic fit and commission the unit.
Realistic expectation: a standard 3×3m cool room shell — two people, most of a day, provided the slab is right and everything is on site. The prep is what takes the time. The panels themselves go up quickly.
FAQ: cool room installation
How long does a cool room installation take?
A standard small-to-medium cool room shell is typically a one-day job for two people once the slab is prepared and materials are on site. Refrigeration connection and commissioning is separate and needs a licensed refrigeration mechanic.
Can I install a cool room myself?
The panel shell, yes — cam-lock panels are designed to be assembled with basic tools and are light enough for two people. The refrigeration plant must be connected and commissioned by a licensed refrigeration mechanic.
Does the floor need to be level?
Yes, and this is the single most important prep step. A cool room is a rigid box; an out-of-level slab makes walls lean, joins gap and the door fail to seal. Check level across the full footprint before you order.
Do I need a floor panel?
Not always. On a sound, level, insulated slab you can often build directly onto the concrete. You want a floor panel for freezers, for suspended floors, or where the existing slab cannot be levelled. Tell us your slab situation and we will advise.
What thickness should I install?
50mm EPS covers most standard cool rooms (0–5°C). Go to 75mm for hot sites or high door traffic, and 100mm PIR for freezer temperatures down to −18°C.
Do you install, or supply only?
Both. We manufacture and stock panels in Adelaide and deliver Australia-wide for DIY builds, and we install throughout South Australia. Send us your dimensions and we will quote either way.
Planning a cool room installation?
Send us your room dimensions and what you are storing. We will come back with panel spec, quantities and a delivered price — or a full supply-and-install quote.