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Mats, Jack Stands and Rolling Loads on Epoxy
Weight is not the same as pressure
A coated garage floor can hold a car, a workbench and a loaded storage rack without complaint, and yet a small jack stand might leave a permanent mark. The explanation is pressure. Weight divided by contact area is what a coating feels, and a narrow foot concentrates a modest weight into an intense point. Seeing loads in terms of pressure explains why some objects are harmless and others need a pad.
Jack stands and jacks
A pair of jack stands under a car may carry well over a ton between four small steel feet. The feet are often a couple of inches across, sometimes with a ridged or serrated base. That is a lot of pressure on a film only a few hundredths of an inch thick. Cured epoxy is hard and resists compression, but under that pressure it can indent, crack at the edges of the foot, or chip away.
A flat plate of steel or a thick piece of plywood under each foot spreads the load. Rubber pucks sold for lifts also help. The pad should be larger than the base of the stand, thick enough not to flex, and clean on the underside so grit does not get pressed into the coating.
Floor jacks have small wheels and a lifting pad. Moving a loaded floor jack across the floor is a concentrated rolling load, which brings its own risk, discussed below. Lowering the jack before shifting it is wise.
Rolling loads
Wheeled items concentrate weight in a different way. Four hard casters on a full rolling tool chest can each carry hundreds of pounds on a contact patch the size of a coin. As the cabinet moves, the wheels press and drag, and any grit under them acts like a chisel. Small hard plastic or steel wheels are the worst; wide, soft rubber wheels the best.
- Replace small hard casters with larger polyurethane or rubber ones.
- Keep the path clean before rolling a heavy cabinet.
- Avoid pivoting a loaded cabinet in place, which scrapes the wheels sideways.
- Lock wheels with the cabinet off the floor if possible, or use a pad under the feet.
Pallet jacks and dollies carry even more weight on even smaller wheels, so a hard coating over a thin primer may chip where they cross. Protective boards laid over the route spread the load.
Floor mats
Mats solve several problems. A rubber mat in the work area protects the surface from dropped tools and softens standing. A wide mat under a workbench spreads the weight of the legs. Interlocking tiles allow modular coverage. Mats near the door catch grit before it travels onto the floor.
Not every mat is suitable. Mats made of certain rubber compounds contain plasticizers and oils that can migrate into a coating and leave a stain, particularly on lighter floors. A mat with a flat, nonporous backing can trap water and fluids against the coating. Mats should be lifted occasionally, the floor beneath checked and cleaned, and the mat itself shaken out.
Storage racks and shelving
Metal shelving units concentrate a lot of weight on four or more narrow feet. Fully loaded, they can press hard enough to dent a soft or young film. Foot pads, wide plastic glides or a board running under the feet distribute the load. Placing racks on a floor that has fully cured is essential; the first weeks after coating are the most vulnerable.
Workbenches and heavy machines
Stationary machines such as a drill press, table saw or compressor shake as they run, and vibration works feet into the film over months. Rubber isolation pads under each foot absorb the shaking and spread the load. A sheet of hard board under the whole machine is even better. Lift-gate loading with a pallet truck or hand cart across the floor calls for wide wheels and a clear path. Where a bench is bolted down, the anchors should pass through the pad rather than pinch the coating around the bolt.
Motorcycles and kickstands
A motorcycle on its side stand is a classic point load: a heavy machine resting on a small metal foot. Over time, the foot digs into the film, and a hot afternoon makes the effect worse. A flat puck or a piece of hard rubber under the stand ends the problem. Wheel chocks and stands with wide bases are also kinder to the surface than bare metal points.
Temperature and load
A warm floor is softer than a cool one. A load that makes no impression on a cool morning may dent the same floor on a hot afternoon. Where heavy items must be placed in a hot space, pads are even more important. Leaving a heavy item in one spot for months can also create a permanent shape in the film, a shallow depression that appears as a footprint when the item is moved.
Choosing pads that do not cause new problems
A pad is only as good as its material. Solid plywood works but can wick moisture if left in contact with a damp floor, so a sealed or painted board is better. Hard plastic puck pads are clean and strong. Rubber works well as long as it is a nonstaining type; avoid dark, oily rubber on a light floor and always check the underside for trapped grit before setting anything down. Felt pads suit shelving legs, as long as they are replaced when they compress or pick up debris. A good habit is to lift each pad when cleaning, wipe both sides, and look at the floor beneath. A pad that was meant to protect the surface can become the very thing that scratches it once it collects sand.
Checking under loads
Every so often, shift mats, lift pads and move items to inspect the floor beneath. Look for dents, discoloration and trapped moisture. Small marks can be buffed or refreshed with a clear coat. Cracks in the film beneath a leg suggest the load is too concentrated and the pad too small.
Handling loads with a little thought spares the floor. A pad costs very little and a lifted, cracked patch is a bigger job. The coating is tough, but it is not indifferent to how weight is delivered.