Fixed height supports are the best method of supporting pavers over waterproof surfacess with very little slope. The supports are availabel in 3/8th" and 5/8th thickness with 1 /8th spacer tabs. The supports are designed to be stack-able. These supports can be shimmed up with plastic shims to create an effective raised floor with great vibration dampening. Starting at $2.00-2.99 Also availble are 1/16" rubber shims discs for micro adjusting the height.