Do's and Don'ts of Paver Installation: Step 2 of 3
Avoid stone dust or limestone screenings, as these materials usually have too many fines (dust) that trap water that can cause early failure of the pavers. Sand is often used. Instead of sand, you can also use a small chip stone called "ASTM #9s," "HPB" or "clear 1/8″ chip." This material is increasingly popular because it is free ...