Understanding Infiltration Rates in Permeable Hardscapes: How ROMEX Stands Out

Infiltration rates are a critical factor in the performance and longevity of any permeable hardscape installation. The ability of a surface to manage stormwater efficiently directly impacts its durability, maintenance needs, and environmental benefits. Industry standards, such as those set by the Interlocking Concrete Pavement Institute (ICPI), recommend that new permeable interlocking concrete pavement (PICP) systems achieve a minimum infiltration rate of 100 inches per hour (in/hr), tested per ASTM C1781. However, many systems degrade over time due to sediment buildup, requiring periodic cleaning when rates fall below 20 in/hr.

Industry Standards for Permeable Surfaces

According to CMHA guidelines, permeable pavement systems should be tested at least twice per year to assess sediment accumulation and maintain their infiltration capacity. If more than 20% of the surface shows ponding after a rainstorm, additional infiltration testing should be conducted. The following benchmarks help determine when cleaning is necessary:

360 in/hr or higher – Ideal performance
20 in/hr – Cleaning required to maintain functionality
100 in/hr – Minimum industry standard for new installations
Below 10 in/hr – Immediate remediation needed

ROMEX Permeable Solutions: Exceeding Expectations

ROMEX has engineered its jointing and bedding materials to significantly surpass industry infiltration standards, ensuring long-lasting performance with minimal maintenance. ROMEX resin products boast exceptional infiltration rates:

ROMEX DRAIN: 703 in/hr
ROMEX EASY: 554 in/hr
ROMEX W1000: 106.2 in/hr
ROMEX D1: 106 in/hr.
ROMEX ECOFINE: 55.9 in/hr
ROMEX FLEX JOINT: 23.1 in/hr

These rates exceed the 100 in/hr threshold required for new installations and provide a major advantage over chip fill. A pressure washer restores resin joints back to their original permeability.

Ongoing Maintenance for Peak Performance

To keep your permeable hardscape functioning at its best, we recommend pressure washing the surface twice a year. This helps restore infiltration rates by removing sediment and organic buildup that can clog joints over time. In areas with heavier debris or runoff—such as beneath trees, near roadways, or in high-traffic zones—more frequent cleaning may be needed to maintain optimal permeability. Regular maintenance ensures your surface continues to manage stormwater effectively and extends the life of your installation.

Why ROMEX Stands Above the Competition

Unlike other jointing materials that degrade and trap sediment, ROMEX’s advanced permeable technology ensures that rainwater infiltrates efficiently, reducing runoff and promoting groundwater recharge. This means fewer maintenance cycles, improved site drainage, and a longer-lasting, more sustainable hardscape.

For contractors and designers looking to meet or exceed infiltration standards while minimizing long-term upkeep, ROMEX jointing solutions are the clear choice. With a commitment to durability and environmental responsibility, ROMEX provides a proven, high-performance alternative to conventional jointing materials, ensuring that your hardscape remains both functional and beautiful for years to come.