An underlayment for use between a veneer material and a foundation surface comprises a base layer and a series of supports extending upwardly from the base layer. The supports are configured to create voids in a layer of bonding material used to adhere the veneer material to the underlayment. Each of the supports includes at least one outer wall extending upwardly from the base layer and terminating at an upper lip, a bowl area defined adjacent a center of the support; and an internal wall extending downwardly from the upper lip toward the center of the support to at least partially define the bowl area within each of the supports.