Q. What is the thickness of a stone slab?

Answer

Quality stone slabs are typically at least 1.25 inches (3cm) thick while thinner cuts may be used for specific purposes. Prefabricated countertops are one such example. Kitchens often utilize 3cm whereas 2cm has been reserved for bathrooms because of reduced strength requirements. It's not uncommon for these to be only 1-2 cm (about 3/8-3/4") thick as they are often sliced thinner to optimize value when they are mass-produced and shipped from another country. Natural stone countertops for use in the kitchen bathroom and elsewhere have a typical thickness of 1.25 inches. Because of its thickness a plywood backing isn't necessary to ensure the surface remains flat and level.