• Permeable uses: Regularly sweep or pressure wash (low pressure) to clear debris, sediment, or vegetation from voids to preserve drainage.
  • Walls: Apply external plaster, render, or coatings for weatherproofing and aesthetics.
  • Avoid heavy chemicals or de-icers that could damage the structure.
  • Inspect for clogging or erosion periodically. Maintenance is generally low but focuses on keeping permeability intact where required.