A Green Roof for the Iconic 700 Market Building

Employees with The Laclede Group have a new place to call home in the recently redeveloped General American Building at 700 Market Street, now known as 700 Market.

Originally opened in 1979, this six-story structure is the only St. Louis building designed by Philip Johnson, one of the most acclaimed 20th-century American architects.

Bade Roofing was proud to be a part of this project, working with Tarlton Corporation and The Koman Group.

The Challenge
Create a green rooftop garden courtyard as well as a new 6th floor roof to meet lead specifications while coordinating with other trades and construction schedules.
The Solution
Through coordination with Tarlton Corporation, Bade Roofing removed the existing paver ballast, 2” of EPS insulation, and 2-ply SBS modified roof system down to the structural concrete deck; then installed a new 115-mil Fleeceback loose-laid TPO roof system, including flashing of green roof penetrations; while keeping within the construction schedule. Stacked three layers of loose-laid EPS insulation and a protection mat over the new TPO roof system, in preparation of patterned three-color concrete paver system, wood paver, and pre-planted “Green Bloc” vegetation trays that were installed on a leveling pedestal system, including trees in planter boxes and raised areas filled with growth medium, planted with various shrubs, plants, and a fescue lawn area. Installed a two-foot wide buffer of landscape gravel at the perimeter between the pavers and the parapet wall to aid in draining of the system. 6th Floor Roof: removed the existing gravel ballast and protection mats and hauled away; removed the existing two-inch EPS insulation and set aside for reuse; installed a 60-mil ballasted EPDM roof system using the saved two-inch EPS insulation; and installed protection mats with new gravel ballast.
Green Garden Courtyard - 5th Floor

Stacked three layers of loose-laid EPS insulation and a protection mat over the new TPO roof system, in preparation of patterned three-color concrete paver system, wood paver, and pre-planted “Green Bloc” vegetation trays that were installed on a leveling pedestal system, including trees in planter boxes and raised areas filled with growth medium, planted with various shrubs, plants, and a fescue lawn area.

Installed a two-foot wide buffer of landscape gravel at the perimeter between the pavers and the parapet wall to aid in draining of the system

6th Floor Roof

Removed the existing gravel ballast and protection mats and hauled away.

Removed the existing two-inch EPS insulation and set aside for reuse.

Installed a 60-mil ballasted EPDM roof system using the saved two-inch EPS insulation, and installed protection mats with new gravel ballast.



Project details

client

The Laclede Group

location

700 Market St., Downtown St. Louis

type

New Green Roof & Re-Roof 6th Floor

materials

Firestone 115-mil fleece back TPO with landscape overburden 60-mil ballasted EPDM roof system

size

Green Roof Level 3.7 (17,800 square feet) • 6th Floor Roof (17,800 square feet))

1. Growth Media

2. Filter Fabric

3. Drainage Media/Gravel

4. Protection Fabric

5. Root Barrier

6. Insulation with Drainage

7. TPO

8. 1/2" DensDeck Prime

9. Approved Insulation

10. Substrate

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