Landscape Contractor / Design Build Maintain

MAR 2015

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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Most municipalities have an allotment of total impervious surfaces for new con- struction and renovation projects. This can be costly and quite cumbersome for developers, landscape architects and con- tractors. One way they are working to lessen the quantity of impervious surfaces is by utilizing Xeripave which has a runoff analysis of 0.00. An exotic car dealership in Wilsonville, Ore., needed to pave an outdoor showcase and drive-thru area at their new facility. Dennis Banks Construction installed 3,000 square feet of Xeribrix, a new product line that is used in light vehicular applications such as parking lot trench drains, drive- ways, aprons, and the like. The pavers were installed by hand and compacted with a machine. The installers reported that the major challenge on this job was making sure everything came out level. Preparation of the Base The sub-grade requirements are similar to pervious concrete/asphalt or permeable concrete pavers, that being clear, crushed aggregate base; keeping in mind that with such a large infiltration rate, the pavers will only be able to infiltrate what the base layers will allow. For vehicular uses, it is advised to in- stall a geotextile fabric to preserve the load bearing capacity of the base over a greater length of time and to avoid migration of base material into the sub grade. The rock sub-base should be com- posed of a minimum of 6" of free draining ASTM No. 2 aggregates. The base is comprised of ASTM No. 57 aggregate at a minimal depth of 4" fol- lowed by 1 ½" to 2" of ASTM No. 8 ag- gregates. The bedding layer is spread, screeded and compacted to prevent shifting. After the pavers are placed they should be com- pacted using a vibrating rubber plate. Base preparation for the dealership took three men approximately one day. Above: An exotic car dealership in Wilsonville, Ore., decided to pave an outdoor showcase and drive- thru area at their new facility with 3,000 square feet of Xeribrix, a new, smaller pervious paver from Xeripave. It has a runoff analysis of 0.00. Left: To preserve the load bearing capacity of installations designed for light vehicle applications, Xeripave advises to use a geotextile fabric before a sub-base of free draining ASTM No. 2 aggregates at a minimum of 6" in depth, a base of ASTM No. 57 aggregate at a minimum of 4" in depth, followed by ASTM No. 8 aggregates at a minimum of 1 ½" to 2" in depth. Pervious Bases Xeripave by Debra McNamara, Xeripave, LLC 32 LC DBM Is the base preparation for pervious paving surfaces different from permeable or impermeable surfaces? Here are two case studies, one using pavers and one using a poured-in- place solution, to help answer that. (Continued on page 34)

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