Quartz weight per square foot is a critical factor to consider when choosing quartz countertops for your home. Quartz is a durable and beautiful material, but it is also quite heavy, weighing approximately 10.5 pounds per square foot. This weight can be a concern if you are planning to install quartz on a weak or fragile surface. However, there are a number of ways to mitigate the weight of quartz, such as using a thicker substrate or installing it on a reinforced surface.