By Linda S. Velazquez
Cira Green at Cira Centre South
Philadelphia, PA, USA
52,000 sf. Blue-Green Roof
Project Description & Details
Located in the University City District of Philadelphia, Cira Green at Cira Centre South is the city’s first elevated park and part of developer Brandywine’s 2.7 million square foot mixed-use Cira Centre South neighborhood. Tucked between the Evo Tower and the FMC Towers, Cira Green is a 52,000 square foot oasis perched 11-stories atop a parking garage, offering much needed open public green space with amazing views of the Philadelphia skyline and the Schuylkill Riverfront. Designed by Roofmeadow, Cira Green has a unique water storage system beneath its sloping lawn, swaying meadows, and the pavers on the roof: Cira Green is also Philadelphia’s first blue-green roof, which can route stormwater to the green roof areas.
Cira’s innovative blue-green roof design provides a higher level of stormwater performance than conventional green roofs. Thin detention cisterns, dubbed “pancake cisterns” by Roofmeadow, placed below the paving, capture rainfall and release it gradually to the adjacent planted areas via a system of Sutro weirs. The combined blue-green design both regulates flow rate and treats runoff prior to discharge from the roof. Moreover, integrating the park programming with stormwater management strategies avoided the cost of building additional at-grade measures to collect and treat runoff associated with the paved areas on Cira Green. Rooflite® growing media was engineered specifically for the different types of green roofs included in this project including large lawn areas, a meadow, and planters with trees and colorful perennials and vines. VersiCell drainage underneath was provided by Tournesol Siteworks. By artfully integrating an unobtrusive stormwater management strategy into this extensively paved, high-traffic park, Brandywine and the design team created a new standard for city living which leverages the roof plane for unparalleled amenity spaces that also aggressively manage stormwater.
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Owner: Brandywine Realty Trust
Location: Philadelphia, PA, USA
Building Type: Multi-Use
Size: 52,000 sq.ft.
Access: Accessible, Open to Public
Designers/Manufacturers of Record:
Architect: Erdy McHenry Architecture, LLC
Owner/Developer: Brandywine Realty Trust
Landscape Architecture, Blue-Green Roof Design & Stewardship: Roofmeadow
General Contractor: Hunter Roberts Construction Group
Civil Engineer: Pennoni Associates
Structural Engineer: Tim Haahs and Associates
Waterproofing: EDA Contractors, Inc.
Growing Media: rooflite®
Drainage Supplier: Tournesol Siteworks
Construction and Maintenance: Sean’s Landscaping
MEP Consultant: AKF Engineers
Photography: 2 Photos ©Albert Vecerka/Esto; Roofmeadow; rooflite; Brandywine Realty Trust
Project of the Week Video Feature
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Love the Earth, Plant a Roof (or Wall)!
~ Linda S. Velazquez, ASLA, LEEP AP, GRP