Client: Chicago Transit Authority and Chicago Department of Environment

Location: Chicago, IL

Size: 3,100 ft²

Installation Contractor: WESTON and Bennett & Brosseau Roofing

Landscape Design: WESTON

Rooftop System: Extensive

Status: Completed Fall 2002

Project Narrative: One of many GreenGrid^® systems to be installed in Chicago is on a Chicago Transit Authority (CTA) substation along the CTA’s elevated Red Line. The new green roof is plainly visible to the thousands of passengers who ride the elevated train commuting to and from downtown on a daily basis.

The 3,100 ft² rooftop garden was installed using the GreenGrid^® 4-inch modules pre-filled with a lightweight soil media and vegetation, and the GreenGrid^® pavers. Installation was completed in 2 1/2 days, including placement of 318 GreenGrid^® 4-inch modules and 128 GreenGrid^® pavers.

Rooftop vegetation included Sedum spurium ‘Tricolor’, Sedum kamtschaticum, Sedum spurium ‘Fuldaglut’, and Festuca amethystina ‘Superba’. Species were aligned according to the rendering and will be visible for years to come.

All work for the CTA rooftop garden was completed on time, within the allocated budget, and without any health and safety incidents.