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Greenroof Project of the Week for September 30, 2013: The Empire State Building

on October 2, 2013 at 10:24 am under Project of the Week: 9/30/13

The Empire State Building
New York, NY, USA

21st Floor East & West – 3,450 sq. ft. each;
25th Floor Northwest – 1,000 sq. ft.; &
30th Floor West – 1,200 sq. ft Greenroofs


Project Description & Details

Soaring 1,454 feet above Midtown Manhattan, the Empire State Building is the World’s Most Famous Office Building. With new investments in energy-efficiency, building-wide infrastructure upgrades, public areas and amenities totaling more than $550 million, the Empire State Building has attracted and continues to attract corporate office tenants in a diverse array of industries from around the world. Totaling 9,100 sf, four roofs have been greened at the Empire State Building by Xero Flor America:

21st Floor East & West: XF301 + ¾”XT; the dry weight is 7 lb/sf, and the saturated weight is 13 lb/sf. The green roofs on the 21st floor feature rooftop patios with outdoor furniture for the enjoyment of office tenants in the adjacent offices. Xero Flor Plant Mixes: Standard Northern Climate Xero Flor Mix, supplemented with moss species.

25th Floor Northwest: XF322 Sedum-Moss System with a dry weight of 4 lb/sf and saturated weight of 8 lb/sf. This option was used here because this roof area receives little direct sunlight and is not accessible. Xero Flor Plant Mixes: Xero Flor Sedum-Moss Mix.

30th Floor West: XF301 + ¾”XT; inaccessible. Xero Flor Plant Mixes: Standard Northern Climate Xero Flor Mix, supplemented with moss species.

Referring to its comprehensive energy efficiency retrofit program, Tom Durels, executive vice president of Malkin Holdings, L.L.C., which supervises the Empire State Building, says “The new green roofs further demonstrate our sustainability leadership and add appealing green space that enhances the value of office space for our tenants.”

Year: 2011 and 2013
Owner: Empire State Building Associates, LLC
Location: New York, NY, USA
Building Type: Commercial
Type: Extensive
System: Single Source Provider
Size: 21st Floor East & West – 3,450 sq. ft. each; 25th floor northwest – 1,000 sq. ft.; 30th floor west – 1,200 sq. ft
Slope: 1%
Access: Accessible & Inaccessible; Private


Designers/Manufacturers of Record:

Green Roof Designer: Xero Flor America (XFA), LLC
Green Roof System & Manufacturer: XF301 + ¾”XT & XF322, Xero Flor America (XFA), LLC
Green Roof Consultant/ Sun-Shade Analysis/ Maintenance Provider: New York Green Roofs, LLC
Roofing and Waterproofing Consultant: CRA / CRS, Inc. – Commercial Roofing Solutions, Inc
Wind Security Components: Green Roof Solutions, Anchor and Disk System
Geogrid: TenCate Geosynthetics Americas, Miragrid LS
Pavers: Hanover Architectural Products, Prest Pavers
Irrigation System: National Lawn Sprinklers, Inc.

Click 21st Floor East & West, 25th Floor Northwest, and 30th Floor West to see more information about this project in The International Greenroof & Greenwall Projects Database.

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Love the Earth, Plant a Roof!

~ Linda V.