Question 1

How does CP compare to asphalt on a cost-per-SF basis?

Accepted Answer

On a full installed basis — surface, labor, subbase, and drainage — CP runs $14–$20/sf. Conventional asphalt runs $12–$20/sf fully installed and concrete runs $18–$28/sf. CP is cost-competitive with concrete and below porous concrete and PICP, while being the only pedestrian-route-specific permeable surface in the group. On projects where permeability is required by code or preferred by the program, CP also eliminates the need for separate stormwater infrastructure — which often changes the total project cost picture significantly.

Question 2

Is CP approved for use on ADA-required accessible routes?

Accepted Answer

Yes. CP is designed to be firm and stable when properly installed, which are the ADA surface requirements for accessible routes. The permeable system does not compromise surface stability. Cross-slope must not exceed 2% and running slope must comply with applicable accessibility standards. Slip resistance is tested to ASTM E303 and the report is included in the spec pack.

Question 3

How does CP perform in freeze-thaw climates?

Accepted Answer

The permeable system drains vertically, which removes the subsurface water that causes freeze-thaw heave in conventional impervious pavement. The SBR rubber component also provides flexibility that accommodates minor substrate movement without cracking. Flexus is manufactured in Atlanta and our installed base is concentrated in the Southeast — we have limited long-term field data in harsh freeze-thaw climates. Consult with us before specifying in Zone 5 or colder environments.

Question 4

Can CP be used on a multi-use path shared by cyclists?

Accepted Answer

CP is designed and tested for pedestrian routes only. Shared-use paths that include cyclists, particularly at higher volumes or speeds, introduce loads and surface wear patterns outside our tested parameters. Low-frequency cycling on a path that is primarily pedestrian is a different condition and can be discussed on a project-specific basis.

Question 5

What is the maintenance requirement after installation?

Accepted Answer

CP requires minimal routine maintenance compared to concrete or asphalt. There is no crack sealing, no patching of thermal expansion joints, and unlike loose aggregate, nothing to redistribute after heavy rain or foot traffic. Routine maintenance consists of clearing debris and periodic inspection of edge restraints. In areas with heavy leaf fall or silt-laden runoff, low-pressure rinsing restores drainage. A maintenance protocol is included in the installation guidelines.

Question 6

What is the expected service life of Flexus CP?

Accepted Answer

Flexus CP is designed for a service life of 15–20 years in properly installed and maintained pedestrian applications. Actual longevity depends on traffic load, base stability, climate, and maintenance practices. This projection is based on binder system performance data, comparable installations, and accelerated UV testing (ASTM G154).

Question 7

Is Flexus CP available with a CSI specification?

Accepted Answer

Yes. CSI-formatted specification language for Flexus CP is available as part of the full spec pack, on request. Formatted for Division 32 (Exterior Improvements). Editable for project-specific requirements including lift selection, base specification, and edge restraint conditions. The spec pack also includes product overview, installation guidelines, cross-section details, and all ASTM and EPA testing reports.

Civil-grade permeable pavement for municipal pedestrian routes

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