Landscape Contractor / Design Build Maintain

JUN 2018

LC/DBM provides landscape contractors with Educational, Imaginative and Practical information about their business, their employees, their machines and their projects.

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said Patrick Doyle, managing partner, LOT42. "It also has the strength and durability we needed for our truck dock." With permeable pav - ers, the only permeable area is the space in the joints between them. In contrast, the entire surface of permeable pavement is porous. "To get an equivalent amount of stormwater reduction, an installation of concrete permeable pavers would need to be larger and therefore more costly," said Roth. "Installing permeable pavement is easier and faster than laying pavers," said Zehr. He explained that it requires less extensive excavation and base preparation. Contractors pour it inside guides they put in place with screed boards, screed the material to the desired depth, and finish it with standard tools like trowels and bull floats. Permeable pavement conforms to any shape, versus the time-consuming work of cutting pavers to shape and fitting the pieces together like a jigsaw puzzle. The rubber chips come in different colors. The distributor created a custom green-tan color mix, which was alternated with the standard green color. Resourcefulness to the Rescue Contractors usually mix the material in small batches in a portable mortar mixer, dump it into a wheelbarrow, and shovel it out. That works well for smaller projects, such as a patio or a set of permeable tree surrounds along a sidewalk (see sidebar). To more efficiently pave long, wide rows of the material at LOT42, Roth devised a screed box and constructed two versions; 3-1/2-feet-wide and 6-feet-wide. With the boxes, pulled by a skid steer, Roth and Zehr could mix and install larger batches of the material. Was the project a success for Zehr Interlock & More? "LOT42 is having us install more in the courtyard area," said Zehr. "It is a high-profile project we are using with (the distributor) to sell other big, commercial projects." 10 LC DBM Above The crew at Zehr Interlock & More, owned by Kris Zehr, installed the material at a depth of two inches on a 3"-5" base of compacted aggregate. Above The city of Kitchener has strict stormwater regulations to help decrease long-term municipal utility costs. To meet them, the project incorpo- rated a 50' x 20' French drain as well as the permeable pavement. >> As part of its continuing stewardship of the city's urban trees, the Seattle Department of Transportation re- placed 38 metal tree grates with permeable tree surrounds installed with Porous Pave XL, thus reducing stormwater runoff, and tripping hazards since tree roots had pushed the grates up from their interior frames. The recycled rub- ber content gives it flexibility to withstand root expansion and tree growth, and is slip-resistant unlike grates, which are slick when wet. Though water flows through the open- ings in grates, litter does also, and they can get clogged with weeds. The entire surface of the porous material is permeable to allow rainwater and air to pass through down to the tree roots but debris stays on the surface. www.landscapeonline.com/research/article-a.php?number=30090 Tree Surround Alternative Hardscapes continued from page 8

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