Alternative Permeable Path Surfaces for Arizona Public Art Project

Public artist creating a walking path in Phoenix, AZ needs permeable surface alternatives to decomposed granite. Also wants to create concrete sidewalk with rolling, rippled topography. ADA compliance required.

Permeable ADA-Compliant Options

1. Pervious Concrete

• High permeability, ADA-compliant when properly finished
• Requires experienced contractor, specialized mix
• Can be integrally colored, stained, or seeded with aggregate
• Maintenance: periodic vacuum sweeping

2. Recycled Rubber Composite Pavers

• Made from tires + polyurethane binder
• Flexible, permeable, ADA-compliant
• Available in colors, patterns
• Cooler than concrete, slip-resistant
• Examples: Flexi-Pave, Rubberway

3. Porous Asphalt

• Similar to pervious concrete, asphalt-based
• Smoother surface than pervious concrete
• Good for longer path stretches

4. Stabilized Decomposed Granite (Improved Version)

• DG + organic binder (Psyllium, Stabilizer Solutions)
• Firmer, more stable, better ADA compliance
• Still natural appearance

Creating Rippled Concrete Topography

Method 1: Form Liners (Most Controlled)

• Custom or stock polyurethane form liners
• Attach to formwork before pour
• Creates repeatable, precise patterns
• Companies: Scott System, Fitzgerald Formliners

Method 2: Hand-Sculpted (Artistic Freedom)

• Place concrete slightly wetter than normal
• Use floats, trowels, custom tools to sculpt waves
• Work in sections before initial set
• Requires skilled finishers

Method 3: Stamped Concrete with Custom Mats

• Create custom stamp mats from foam/wood masters
• Stamp in overlapping pattern for continuous flow
• More texture than true 3D topography

Critical ADA Requirements

• Maximum 5% running slope without landings/handrails
• Maximum 2% cross slope
• Surface: firm, stable, slip-resistant
• No gaps > 1/2 inch, no vertical changes > 1/4 inch

Recommendation

For the permeable path: pervious concrete with integral color – most durable, truly ADA-compliant, artistic potential.
For the rippled walk: custom form liners – precise, repeatable, contractor-friendly.

Partner with a concrete contractor experienced in decorative/pervious work. Budget for mock-up panels to approve texture and color.