Walk-in cooler with floor or without a floor?
Coolers can stand on a sound, level slab. Freezers always get an insulated floor. Here is how to decide, and what each choice does to your entry and headroom.
A walk-in cooler does not need a floor if it sits on a sound, level concrete or tile slab: the walls stand on your floor and seal with a vinyl screed. A walk-in freezer always gets an insulated floor, and we include one with every freezer, because a sub-freezing box on bare concrete freezes the moisture under it and the slab heaves and cracks.
Order a floor on a cooler when there is no sound, level slab under it: a wood deck, an upper floor, unconditioned space below or a damaged slab. The trade-off is a 4 inch step at the door (a ramp solves it) and about 4 inches less headroom inside.
Why every freezer gets an insulated floor
Concrete holds a freezer up, but it does not insulate it.
Concrete is not an insulator. Put a box held at 0°F to -10°F directly on a slab and the cold travels down through the concrete into the ground. Any moisture in the slab or in the soil under it freezes.
Water expands about nine percent when it turns to ice. Over time that ice lifts the slab from below, cracks it and pushes the wall panels out of level, so joints open and the door stops closing true. This is frost heave, and once it starts it is a repair to your building, not just to the walk-in.
That is why every walk-in freezer we quote includes its floor. A cooler held at 35°F never takes the ground below freezing, so a sound slab can serve as the floor of a walk-in cooler.
How a cooler sits on your slab
Without a floor, the wall panels stand directly on your concrete or tile. Along the base of the walls we supply a 4 inch U-shape vinyl screed, sold by the foot, that holds the panel bottoms in line and closes the joint to the floor. Where the engineering calls for it, aluminum angle is used instead.
The payoff is a flush entry. There is no step at the door, so carts, hand trucks and dollies roll straight in, and staff never trip on a threshold with their arms full.
What the slab has to be
- Level. Panels are cut square to your drawing. If the floor rolls or slopes, the walls follow it, the cam locks pull unevenly and the door can bind. Check with a long level before you order.
- Sound. No open cracks, broken edges or soft spots under the wall line.
- Continuous. The whole footprint, including under every wall, on one slab or tile surface.
- Dry. No standing water at the base of the walls. Outdoors, that means a pad that sheds water away from the box.
Setting the walls on the screed is covered step by step in our installation guide.
When a cooler should have a floor
A floor is optional on a cooler, but some rooms make it the right call.
- Wood deck or wood framing. Wood flexes and soaks up moisture. An insulated floor gives the walls a flat, sealed base of their own.
- Upper floor. A cold slab over an occupied room can sweat on its underside. The floor keeps the cold inside the box.
- Unconditioned space below. A crawl space, basement or garage under the room. The floor insulates the box from it.
- Uneven or damaged slab. If the slab is cracked or out of level and cannot be repaired, talk to us before you order. A floor still needs firm, even support under it.
- Outdoors on a pad. An outdoor box sits on a pad exposed to rain and ground moisture. Outdoor coolers are quoted both with and without a floor; tell us what the pad is made of. The rest of the outdoor checklist is in our indoor vs outdoor guide.
If none of these apply and the slab is level and sound, a floorless cooler is the usual choice. Not sure? Text a photo of the floor to 954-237-6753 or attach it to your quote request and we will tell you which way to go.
What the insulated floor is
The floor is prefabricated 4 inch insulated panels, NSF Listed. The walking surface is heavy gauge smooth aluminum and the underside is stucco-embossed Acrylume. Where the walls meet the floor there is a cove, a rounded inside corner with no sharp seam to trap dirt, so mopping out the box is simple.
The 4 inch step, ramps and headroom
A floor raises the inside of the box by its own thickness, so the entry gets a 4 inch step. Where people carry cases in by hand, that is fine. For carts, dollies or kegs on a hand truck, plan a ramp.
- Inside ramp. 34 inches wide x 30 inches deep.
- Outside ramps. 34, 48 or 60 inches wide x 30 inches deep, to match a standard 34 inch door or a wider 48 or 60 inch door opening.
The floor also takes headroom. In a standard 7'6" box the clear height inside is about 86 inches without a floor and about 82 inches with one. The evaporator hangs from the ceiling and uses some of that top space, so if you plan tall shelving, check the heights on your approval drawing (see real approval drawings) or ask for an 8'0" box.
Combination boxes: one of each
A combination cooler and freezer shares a wall between the two rooms, and the floor is decided room by room. A common line on our quotes reads "Combination Walk-In Cooler Without Floor, Freezer With Floor": the cooler side stands on your slab with a flush entry, and the freezer side gets its insulated floor.
That split gives carts a flat path into the cooler, where most daily traffic goes, and protects the slab under the freezer from frost heave. About 1 in 6 walk-ins we quote is a combination, and in restaurant quotes it is closer to 1 in 4.
Floor or no floor: the comparison
| Point | Without floor | With floor |
|---|---|---|
| Base | Wall panels on your level concrete or tile | Prefabricated insulated floor panels, NSF Listed |
| Base seal | 4 inch U-shape vinyl screed (aluminum angle where required) | Cove at the inside corner of wall and floor |
| Entry | Flush, carts roll in | 4 inch step, ramp optional |
| Inside height, 7'6" box | About 86 inches | About 82 inches |
| Walking surface | Your slab or tile | Smooth aluminum; tread plate or marine plywood options |
| Best for | Indoor coolers on a sound, level slab | Every freezer; coolers on wood, upper floors or over unconditioned space |
| Cost | Costs less: no floor panels or ramp | Adds cost for the floor, plus any ramp |
Freezers are always quoted with the floor.
What our quotes show: more than half of the walk-ins we quote are coolers. Our standard cooler packages are quoted indoor and without a floor, and every standard freezer package includes one. For the other things that move the number, see the cost guide. When you are ready, request your free same-day quote and tell us what is under the box.
Frequently asked
Does a walk-in cooler need a floor?
Not if it sits on a level, sound concrete or tile slab. The walls stand on your floor and are held and sealed at the base with vinyl screed, which gives you a flush entry.
Order the floor if the box sits on wood, on an upper floor, over unconditioned space or on a slab you cannot level or repair.
Why does a walk-in freezer need a floor?
Because a box at 0°F to -10°F on bare concrete freezes the moisture in and under the slab. The ice expands, lifts and cracks the concrete and pushes the walls out of level. The insulated floor stops the cold from reaching the slab.
Can I put a walk-in freezer on my concrete slab?
Yes, the freezer sits on your slab, but on its own insulated floor, never on bare concrete. The slab still needs to be level and sound so the floor panels are evenly supported.
Can I add a floor to a floorless cooler later?
Yes. We have supplied floors to fit inside existing boxes that were made without one. Either way, decide before you sign the approval drawing. A floor raises the inside by 4 inches, which changes the entry and the clear height, so it is far easier to plan up front.
How do I seal a floorless cooler to the floor?
We supply 4 inch U-shape vinyl screed by the foot for the base of the walls; where engineering requires it, aluminum angle is used instead. The screed works best on a clean, level floor. The assembly instructions call for a bead of silicone under the screed and an anchor about every 12 inches; the sealant and anchors are bought locally. Our installation guide walks through it.
Can pallet jacks roll on the floor?
First check the door: a standard 34 inch door will not pass a 48 x 40 inch pallet, so pallet traffic needs a 48 or 60 inch door or a sliding door. A floorless cooler gives the jack a flush entry.
On a box with a floor, plan a ramp and a reinforced floor. Pallet jacks are fine on it; forklifts are not.
Does adding a floor change the quote?
Yes, a floor adds cost for the floor panels, and a ramp is a separate option. Tell us what is under the box and how product moves in, and your free same-day quote will show it, with free shipping on every walk-in we quote.
Also worth a look
Walk-In Freezers
Insulated floor, door heater and electric-defrost refrigeration in every package.
Read moreCombination Cooler & Freezer
A cooler and a freezer sharing an insulated wall, built as one unit.
Read moreInstallation guide
A cam-lock walk-in goes together with an Allen wrench and no framing.
Read moreTell us what is under your walk-in
Send your dimensions, a photo of the floor and how product moves in. We will recommend floor or no floor, show it on a dimensioned approval drawing and send a free same-day quote with free shipping.