Pool table playing surfaces are typically constructed from slate, a dense metamorphic rock chosen for its stability and ability to be precisely leveled. The weight of this slate varies depending on the size of the table and the thickness of the slate itself. A standard 7-foot table with a one-inch thick single piece of slate can weigh between 450 and 550 pounds. Three-piece slate beds for larger tables can weigh upwards of 800 pounds total. The thickness of the slate also contributes significantly to its weight; thicker slates, while providing a more consistent playing surface, also increase the overall table weight substantially.
The considerable weight of the slate bed is a crucial factor in the stability and playability of a pool table. This substantial mass minimizes vibrations and deflections, ensuring a true and level playing surface that allows for consistent ball roll and accurate shots. Historically, slate has been the preferred material for high-quality tables due to its inherent rigidity and durability. This preference has persisted in modern times, with slate remaining the standard for professional and tournament-grade tables.