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New Garden Paths
Pennsylvania Arboretum's Walkways Get Makeover


Developed on a tract of forested land, Jenkins Arboretum & Gardens in
Devon, Pennsylvania, is maintained as a woodland garden filled with
native ferns and wildflowers.

Jenkins Arboretum & Gardens in eastern Pennsylvania includes 1.2 miles of woodland paths through its five distinct garden areas. Recently the Arboretum re-coated 21,000 square feet of the old asphalt paths with Porous Pave XL, a highly porous, durable and flexible pour-in-place permeable paving material made from 50 percent recycled rubber chips and 50 percent stone aggregate with a moisture-cured, liquid binder.

"I knew about it from other arboretums and botanical gardens that have used it," said Harold Sweetman, Ph.D., executive director, Jenkins Arboretum & Gardens. "After talking with colleagues and seeing some installations for myself, I thought the material would be a solution as a topcoat over our asphalt paths, which had become worn and cracked, with pot holes in some spots, heaving in others."

"Pouring an overcoat of XL on the old asphalt filled in the cracks and holes and created an even surface," said Dave Ouwinga, president of the manufactuer. "The 50 percent rubber content makes the paths more slip-resistant and more impact absorbing."

"The project required a pervious material that could be over-poured on the asphalt, provide slip resistance, be installed with minimal site disturbance to protect the grounds and plants, and offer color options to blend in with the landscape," said Jim Dowd, senior business development manager, Aquarius Supply, Norristown, Penn., a regional distributor that serves landscape and irrigation professionals throughout the Northeast.

Geesey's Rock & Block Designs, the contractor selected for the project, pressure washed the asphalt to remove dirt, algae and moss. The crew mixed the material onsite and poured and troweled one inch over the top of the asphalt. In some sections, the paving material was also installed on some mulched areas extending out from the paths. The crew removed the mulch, installed and compacted a two-inch base of 3/4 -inch aggregate, and then poured 1.5 inches of Porous Pave.

"It is the only permeable paving material we have worked that enables you to achieve a uniform, level and seamless surface across areas of new installation on a stone base and over coated sections of existing asphalt or concrete," said Bryan Geesey, owner, Geesey's Rock & Block Designs, Reading, Penn.

"The winding paths are one of the essential design features of the Arboretum. With their curves, switchbacks and slopes, the pathways invite visitors into an immersive experience with garden discovery around each bend," said Sweetman. "The product gave us exactly the result I had hoped for to renew and improve the paths, and the material's color and texture harmonize with our gardens' landscaped settings."

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October 23, 2019, 9:59 pm PDT

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