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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ROOF TOP by Alec Gunn Above The Central Park West penthouse has a 500-square-foot lower walled terrace. Easter Red- bud and Kousa Dogwood trees are situated in light- weight planters. Located at the bottom of the photo are Lantana camara perennials. Wrapped around the build- ing's elevator shaft (right) is a recirculating fountain made of powder-coated aluminum and steel framing with a gray patina. A small pipe feeds the water into the planter basin underneath the black body. Because the water eventually evaporates, replenishment is needed. A pump drives the water up through the fountain and then cascades down. Since the project was located on the rooftop, the materi- als had to be lightweight, transported in sections and assembled on-site. A A rooftop garden or terrace can serve as a nat- ural extension of a New York City residence and can be a place to relax and retreat from urban life. A successful rooftop installation needs to factor in many considerations including weight restrictions, how the furniture is assembled, wind and weather conditions, plant selection, and irrigation – to name a few. When Gunn Landscape Architecture designs a rooftop project, they pay special attention to the live load of the materials that are placed or built onto a terrace. Determined by a structural engineer, the live load is how much weight a roof or terrace can support that consists of mov - able objects, people, and loads created naturally by the environment, as opposed to structural elements, like the beams that are part of the roof's foundation. Lightweight pavers and faux- stone planters (rather than real stone planters) are some examples of materials that can help reduce the live load. Gunn also ensures that they select furnishings and planters that are easier for sister company Vert Gardens to install on their projects. These tend to follow a modular system of installation on a rooftop. Long planters that border a roof garden won't fit into a service elevator unless they are transported in sections to the site, where they would have to be assembled to form a complete set. Sometimes, hoisting materials is necessary too. Another aspect of a live load is water–whether that comes from standard irrigation or rain. To ensure that roof gardens stay properly hydrated but minimize the amount of water on the ter - race, Vert Gardens often installs paving on a pedestal system for proper drainage, and uses Xeri-Bug Emitters in planters and pots. New York City rooftop projects that Vert Gar - dens has installed include: two Central Park West terraces and two Chelsea terraces that are connected to their respective penthouses, and a wrap-around terrace for a SoHo pent - house. Each project took about four to six months to complete with a Vert crew of about six to ten people. Central Park West Penthouse The Central Park West penthouse features a 500-square-foot lower walled terrace and 118-square-foot upper tower roof deck. The clients wanted the lower terrace to have a pri - vate garden surrounded by trellis screening covered with Boston Ivy and English ivy, where they could spend time reading and relaxing. As the roof deck is more of a balcony overlooking 28 LC DBM How to Overcome the Challenges in Building One renovations How to Overcome the Challenges in Building One

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