FREQUENTLY ASKED QUESTIONS
HOW LONG DOES PERMEABLE CONCRETE LAST?
When properly installed and maintained, permeable concrete typically lasts 15–20 years.
Re-sealing or resurfacing may be needed every 4 years depending on use and local conditions.
CAN PERMEABLE CONCRETE CLOG UP?
Yes — but regular sweeping or surface washing will help prevent it. If clogging occurs, an industrial
vacuum can be used to clear the voids.
HOW LONG DOES IT TAKE BEFORE THE SYSTEM CLOGS UP?
It depends on the site and the level of sediment in the run-off. Key factors include:
• Whether the system is located in a suitable place.
• The amount of organic matter (eg, leaves) or clay present.
• The level of maintenance (sweeping is recommended).
Sites with high clay content or heavy organic loads should be avoided, or cleaned regularly.
WHAT IS THE VOID RATIO IN PERMEABLE CONCRETE?
It typically ranges from 15-30%. Permcon permeable concrete usually delivers a consistent
20–25%.
HOW CAN I TEST THE PERMEABILITY OF MY PAVEMENT SYSTEM?
Use ASTM C1701/C1701M–09: Standard Test Method for Infiltration Rate of In-Place Pervious
Concrete. It’s a simple test that can be performed on-site.
CAN PERMEABLE CONCRETE BE PUMPED INTO AN INSTALLATION?
No. Because it’s a low-slump product, it cannot be pumped like traditional concrete. It must be
placed manually or with adapted methods.
WHAT KIND OF AGGREGATES CAN I USE FOR THE BASE COURSE?
Use specifically designed drainage aggregates that remain stable when saturated. Standard GAP
aggregates are not suitable and will lead to pavement failure.