The most common cause is improper selection of the type of cover. In particular, heavy-rolling loads can destroy even the best floor covers if they aren’t designed to take high loading.
CAUTION: There is another element that’s critical to the successful function of the floor covers, and that’s the use of shims during installation. It is common practice to oversize block-outs in the concrete and then use shims to level the floor cover. This is OK provided the contractor pours a leveling grout between shims to ensure a continuous base for the floor cover. Most often the covers are bolted down through the shims and the block-out filled with grout/lean concrete. In this case, it’s unlikely that the grout will find its way consistently beneath the frames resulting in poorly bedded floor covers. The use of rolling equipment will cause rocking or bouncing of the frame and eventually lead to failure of the grout pocket and cracking of the floor finish. It is imperative that you specify that, if shims are to be used in the installation process, the contractor ensures that there is a continuous support bed beneath the side frames of the floor cover. We would go further and suggest these frames be inspected prior to filling the block-out with grout.
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