Part 4 of the “Designing with Strength” series for landscape architects and designers Previous post in this series: Holding the Line: Edge Restraints and the Art of Durable Paver Design Note: This series of articles is intended to provide an introduction to the concepts behind paver design for designers. It is not intended as a 'How To' guide for installers or contractors. Coarse Sand or Polymeric Sand Stabilizer is commonly used to fill joints and secure interlocking pavers.