Freezer Floor Slab Design
Camila Farah
Finished floor in freezer applications this surface is typi cally concrete.
Sean o brien is a senior project manager in the new york city office of boston based simpson gumpertz heger inc. As i mentioned earlier this is dependent on the estimated loads to be placed on the slab. O brien specializes in building science and building envelope performance including computer simulation of heat air and. Mix joint design and performance and the slab thickness.
Freezers are built and floors heave. Type and thickness of insulation this design guide is based on industry standards with a thermal conductivity of. Get a specific design completed from outside drill holes under the freezer add heat to these holes to melt the ice formation once melted floor can be maintained at a normal operating temperature and at normal budget costs. Freezer floor slab design is assumed to be simple.
The concept of preventing floor heave has been misunderstood and misapplied for years resulting in freezer floor failure which causes facility shutdowns and litigation. The major problem with concrete freezer floors is frost buildup under the floor which will cause the floor to lift or heave often destroying the floor and the walls of the freezer as well. This table details some of the special considerations and finishing techniques that are appropriate for each class of floor. As this surface does not generally affect the overall heat load this design guide assumes a 4 10 cm layer of concrete.
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If the temperature of the subfloor approaches freezing usually plus 4 degrees c is taken as the danger point then any water moisture in the subfloor will freeze. Once the old slab is removed you will need to take out an additional 9 inches of material to allow for a 3 inch sub slab and 6 inches of insulation for the new freezer floor assuming the thickness of the new concrete is the same as the old slab. The difficulties in repairing slabs and floor systems in refrigerated buildings highlight the need for more thorough design to avoid these problems. The freezer slab must be insulated to retain the loss of heat from the slab and balance the vapor pressure with the warm ground below the freezer floor.Concrete slab design the concrete slab must be designed to resist the punching shear and weight of the pallet racks. Even though you have insulation under the slab which is really to reduce the heat transfer from ground to freezer the sub grade can freeze and heave the concrete slab. Freezer store concrete floors or wearing slabs must incorporate all the requirements of normal warehouse floors with a few extras for freezing. What are the key design elements of a freezer floor.
Design solutions are shared and misapplied.
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