Your laminate floor is only as stable as the subfloor beneath it. If the subfloor is weak, the laminate floor may bow over time under the weight of the refrigerator. Examine the subfloor before installing the laminate floor. Rescrew any loose screws tightly into the floor joists. If the subfloor bends or bows when you walk across it, replace it or cover it with a new subfloor made from 1/2-inch thick plywood. Glue and screw the new subfloor securely in place.
Just as you would throughout the installation process, ensure that you leave at least 3/8 inch of space between the wall and the edge of the laminate flooring. The humidity and warmth under the refrigerator will cause the laminate flooring to expand. Without adequate room for expansion, the floor may eventually become warped or cupped. Seal the expansion zones with a mildew-resistant, flexible silicone sealant to prevent damage.
To further protect the laminate floor from damage caused by moisture, apply glue to all four sides of each piece of laminate flooring before installation. The glue will prevent moisture from seeping underneath the floor, which can promote mold growth or warp the floor. Slide the refrigerator into place carefully. Laminate floors are durable, but they can't be refinished. If you scratch the floor, the damage is permanent.
Always follow manufacturer's guidelines when installing laminate floors. The manufacturer can recommend the proper underlayment, as well as special installation techniques for your particular type of laminate flooring. Gluing is not recommended for all laminate floors.