Through 2014, Porous Pave Inc. has manufactured product bearing about 6 million lb. of rubber recycled from 200,000 tires. An option for green stormwater infrastructure, Porous Pave is a highly porous, durable and flexible surfacing material consisting of recycled rubber, aggregate and a binder. Controlled shredding and processing of discarded tires produces the one-quarter-inch nominal size rubber chips incorporated into Porous Pave.
Engineered with 29 percent void space, Porous Pave retains stormwater runoff on site, decreases the volume and velocity of rainwater flowing into storm drains and storm sewers, improves water quality by reducing erosion and filtering out pollutants, and recharges groundwater. It allows up to 6,300 gallons of water per hour per square foot to drain directly through its surface, permeate down into a compacted aggregate base, and then slowly filter into the ground.
Porous Pave XL is a hard, heavy-duty material made from 50 percent recycled rubber chips, 50 percent stone aggregate and a moisture-cured urethane binding agent. It is poured in place at thicknesses of 1 – 2 inches atop a compacted aggregate base of 2, 4 or 6 inches, depending on the application and required compressive strength. Contractors use it in public, commercial and residential installations for loading docks, parking lots, driveways, building entryways and courtyards, walkways and sidewalks, and patios and terraces. It can be installed on slopes up to 30 degrees for golf cart paths, hillside trails, or any steep pathway.
The material’s porosity, permeability and slip resistance also make it suited for maintenance and drainage strips, tree surrounds, and non-slip, porous hardscape elements in water features. A second, softer formulation, Porous Pave XLS, is made from 100 percent recycled rubber chips and a more flexible urethane binding agent. Landscape architects specify it for areas such as playgrounds and pool surrounds, which require a more impact-absorbing surface.