Landscape Architect & Specifier News

NOV 2018

LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.

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Continued from page 14 h a rd s c a p e s 16 Landscape Architect and Specifier News was going to present some design and construction challenges," remarked project manager Ishmael Joya. Joya realized that adding what is essentially a mini-park to a very thin structural surface was going to require out-of-the-box thinking. "In any roof deck renovation, it's critical to reduce the weight of the building materials, because the building is only designed to support a maximum amount of weight and that can't be compromised," he said. Fortunately, Joya had already had a strong positive experience with ACH Foam Technologies' Foam- ControlĀ® EPS Geofoam, a lightweight expanded polystyrene (EPS) material with high compressive strengths that is used to reduce axial loading on structures. Joya has also found the product very easy to work with, which saves time and money. Joya worked closely with the design team's structural engineer to make sure the appropriate products were specified to support the expected weight of each area of the renovation. On the Prudential roof deck renovation, EPS 15 was used in areas that would largely be filled with plants and would not bear much foot traffic. EPS 46, chosen for its exceptionally high compressive strength, was used as a structural fill across the design's many grade changes and in areas that would bear more weight of the roof deck occupants. For Joya, another great advantage of using the EPS Geofoam is being able to see the shape of the assembled product and make any required changes before the concrete is poured and rework becomes more complicated. Once the Geofoam was on the roof, the building team assembled the pre-marked pieces, allowing the space to take shape. As each area of blocks was assembled, the construction team was able to survey the progress and fine tune according to the designed curves and contours. Pieces that needed to be further shaped were cut by hand with a reciprocating saw by general laborers. "The transformation of the 11th-floor roof deck really couldn't be more dynamic," said project manager Nick Kinsella with pride. "The space went from a flat, barren roof to a vibrant, inviting private- park that will be a delightful spot for mid-day lunch or after work drinks." Left: Two types of Geofoam were used on the renovation. EPS 15 (or expanded polystyrene) was applied to spaces where people are less likely to tread on, such as in large plant areas. In areas that required more strength to bear weight of occupants, EPS 46 was used. Right, Top & Bottom: Tenants and employees can gather around and relax next to the amphitheater in seating areas spread throughout the deck. Views of the city skyline and Millennium Park can be enjoyed in the open fire pit lounge located towards the edge of the roof.

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