How Much Weight Can A Granite Countertop Hold. Also the weight will be distributed over a fairly large area. Different countertop materials have different requirements.
A typical counter might measure about 30 square feet. 10mm will hold up to 50kg while 12mm will hold up to 100kg. They should know spans granite can handle etc because Granite weight is 18 LB per SF If you take a little slab 4 x4 that is almost 300 LB if that slab goes there is no time to react.
Granite and quartz weighs approximately 20 to 25 pounds per square foot.
The weak spot on a kitchen counter is the sink area. Less than 13 pounds per square foot. But it makes me really nervous to have that hanging over the counter---almost as much as someone standing on it. ¾ inch thick slabs.
