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Porous Pave Permeable Pavement Protects Seattle's Urban Trees and Makes the 3rd Avenue Streetscape Safer for Pedestrians

By: PRLog
Replacing Metal Tree Grates with Porous Pave Permeable Tree Surrounds Reduces Tripping Hazards along 3rd Avenue Sidewalks and Reduces Storm Water Runoff
GRANT, Mich. & SEATTLE - June 7, 2018 - PRLog -- As part of its continuing stewardship of the city's urban trees, the Seattle Department of Transportation replaced 38 metal tree grates along the sidewalks of 3rd Avenue with permeable tree surrounds installed with Porous Pave XL. Running from Space Needle Park to the Smith Tower and Union Station Square, 3rd Avenue is a major thoroughfare with office buildings, high-density housing, retail, and restaurants.  A green building product manufactured in the U.S.A., Porous Pave XL is a pour-in-place, permeable paving material, which combines chips of recycled rubber with granite aggregate and a liquid binder.

"Tree roots had pushed the metal grates up from their interior frames in the tree pits," said Sherry Graham, arboriculturist, Seattle Department of Transportation. "Uneven sections and gaps were a tripping hazard."

Porous Pave's recycled rubber content gives it flexibility to withstand freeze-thaw cycles, root expansion and tree growth without cracking or breaking. Metal tree grates are slick and slippery when wet. With its rubber chips and textured surface, the permeable pavement is slip-resistant.  Water flows through the openings in metal tree grates, but litter also slips through, making them unsightly and difficult to keep clean. Grates can also get clogged with weeds. The entire surface of Porous Pave is permeable to allow rainwater and air to pass through down to the tree roots. Debris stays on the surface where it can be swept up or power washed away.

"Permeable surrounds with Porous Pave are tree-friendly," said Brian Holers, certified arborist, Root Cause, LLC  (Mercer Island, Wash.), the urban tree care specialist who is installing permeable tree surrounds at several locations for the City of Seattle. "Installation requires less excavation and minimizes disturbance of the roots. You can spread and fit the material right up against the edges of tree pits and make it conform to the shapes of tree bases. These are significant advantages, since the maples and little leaf lindens along 3rd Avenue are mature trees planted in 1991."

Root Cause installed the new permeable tree surrounds in January 2018. After removing the old grates from their frames, Holers and his crew poured 1.5 inches of Porous Pave XL on a ½- inch base of 5/8 crushed aggregate. The permeable surrounds average 25 square feet in size. The gray color chosen for the project makes the permeable pavement blend in with the adjacent sidewalks.

About Root Cause

Founded by Brian Holers, certified with the International Society of Arboriculture (I.S.A.) since 1996, Root Cause, LLC offers certified tree and tree root care in the Seattle area. Root Cause provides a comprehensive approach to tree care and has pioneered integrating below ground tree and root work into the overall care of trees. Root Cause addresses all aspects of tree and root protection and care, including root and soil mitigation below ground. Comprehensive tree, root and soil management with Root Cause optimizes tree survival in urban and other challenging environments and reduces the long-term costs of maintaining healthy, beautiful trees. To learn more about helping trees thrive and overcome urban hardships, visit www.rootcauseseattle.com.

About Porous Pave

Porous Pave is a highly porous, durable and flexible surfacing material consisting of recycled rubber, aggregate and a liquid binding agent. An eco-friendly green building product proven for more than a decade, Porous Pave is a pour-in-place permeable paving solution that offers superior permeability for stormwater retention, exceptional versatility, and demonstrated durability. With 27 percent void space, Porous Pave allows up to 5,800 gallons of rainwater per hour per square foot down to flow through and permeate down into the underlying aggregate base. Resilient and slip resistant, Porous Pave conforms to any landscape design and is easy to install on grades up to 30 degrees. For additional information and examples of successful applications, visit www.porouspaveinc.com.

Contact
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Strategic Storyteller
***@strategicstoryteller.com

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Porous Pave, Inc. Logo Old metal tree grate: tripping hazard, difficult and costly to keep clean Porous Pave tree surrounds: gray color complements adjacent sidewalks Porous Pave tree surrounds: rubber content makes the surface slip-resistant Porous Pave tree surrounds: tree-friendly, conforms to the shapes of tree bases Porous Pave tree surrounds: permeable surface so air and water reaches roots

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