LASN is a photographically oriented, professional journal featuring topics of concern and state-of-the-art projects designed or influenced by registered Landscape Architects.
Issue link: https://landscapearchitect.epubxp.com/i/107181
hardscapes (Continued from page 18) had to be durable enough to sustain regular snow plowing. The construction schedule was also dictated by the school year. "Specific site challenges included slopes in excess of 8 percent; portions of the site had no access to existing storm sewer pipes; a snowmelt system had to be incorporated into the design at building thresholds; and water could not migrate into the subgrade within 10 feet of the face of the building," Evans said. "The design team proposed using permeable pavers to meet all of these criteria. The school needed to be reassured the pavers would meet all of the potential traffic loads, and be durable enough to hold up to de-icers and snow plows. Above, Right The pavement profile captures water in places where slopes exceeded 8 percent. This required site specific detailing, including subsurface check dams and subdrains, since typical designs are for slopes less than 5 percent. Above, Left The designer and contractor worked together on careful detailing of edge conditions around utility manholes and valve covers to accommodate the paver geometry and layout. Middle The building architect and project designer created a patterned paver design, with charcoal bands in a tan field laid in a herringbone style. At the main intersection of walkways, an existing traffic circle was "pedestrianized" to earn a LEED Heat Island credit. Lighter colored pavers were selected for some of the paver bands in the radial pattern. Bottom The pavement system was designed for partial and full infiltration, and in places adjacent to the building a liner was included at the bottom of the profile to protect the building foundation from surface water infiltration. An electric snowmelt system was incorporated into the paver design at building entrances. 20 Landscape Architect and Specifier News "The provision of product data, other project references and site visits, along with meetings with the design team and paver reps, provided the assurances the school needed to proceed with permeable pavers. Selection of a contractor with sufficient experience and credentials was critical to the project success, since a number of installation challenges had to be addressed in the field for a satisfactory outcome." From Silver To Gold While the goal was LEED Silver, with the addition of a permeable paver system, Brown Hall achieved LEED Gold certification. "The building addition and site was LEED registered," Evans said, "and the paving system helped obtain the heat island effect and storm water credits." The paver colors were selected to meet solar reflectance values allowing the project to achieve the LEED credit SSc7.1 - Heat Island Effect/ Non-roof. Other LEED credits the paver system contributed to included Stormwater Management Quantity Control Credit 6.1; Stormwater Management Quality Control Credit 6.2; Regional Materials Credit 5. The project also received an HNA Hardscape Award for the Concrete Paver – Commercial/ Industrial Permeable category. The HNA Hardscape Project Awards are produced by the Interlocking Concrete Pavement Institute, and supported by the National Concrete Masonry Association and the Brick Industry Association.