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This is the "Library's Green Roof" page of the "Archbishop Alter Library" guide.
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Archbishop Alter Library  

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Last Updated: Jun 22, 2017 URL: Print Guide Email Alerts

Library's Green Roof Print Page

Library Gets Green Roof - 8/5/2008

Green Roof

Info About the Roof:

     The new green roof on Archbishop Alter Library, the second largest building on campus, was installed on Wednesday, August 6, 2008.  The new roof contains about 8,880 plants that will filter rain water and insulate the building to reduce energy consumption. When in full bloom, the yellow flowers and blue foliage included in the planting will echo the school colors of blue and gold.

     The modular green roof consists of 4,440 square feet of modules filled with root barrier, growth media and drought resistant plants grown locally. The plants are varieties of sedum which bloom in the summer. The center of the roof will contain 177 modules filled with white marble chips spelling the Mount’s initials MSJ.

     The Library’s green roof is designed to reduce heating and cooling costs, extend the lifespan of the roof membrane, and decrease storm water runoff and pollutants into storm sewers. According to industry averages, storm water runoff could be reduced by as much as 90 percent, and heating and cooling costs reduced from 25 percent to 50 percent.


  • The modules containing the plants are a 100% recycled post industrial polyethylene plastic.
  • Each module measures 2 feet by 2 feet and is 2 ½ inches in height.
  • Each module contains approximately 8 plants. There will be about 8,880 plants on the roof.
  • Tri-color foliage of blue, green and red will be in each module. The majority of flowers will be yellow when in bloom.

The plants include:

  • Sedum album - White flowers, green foliage, 3-6” high, blooms in June - July
  • Sedum floriferum 'Weihenstephener Gold' - Yellow flowers, green foliage, 3-6” high, blooms June - August
  • Sedum kamtschaticum - Yellow flowers, green foliage, 6-8” high, blooms June - July
  • Sedum reflexum 'blue spruce' Yellow flowers, blue foliage, 4-6” high, blooms July
  • Sedum sexangular - Yellow flowers, green foliage, 6-8” high, blooms June - July
  • Sedum spurium 'fuldaglut' - Ruby red flowers, red/green foliage, 3-6” high, blooms July
  • The plants are expected to mature in two growing seasons.  The plants were grown locally at Krueger-Maddux Greenhouses in Sunman, Indiana.
  • The green roof was designed by McGill Smith Punshon, Inc. (MSP).
  • Imbus Roofing Company Inc. removed the old roofing and prepared the library roof to accommodate the modules.
  • The Mount’s modular green roof system is called GreenGrid® developed by Weston Solutions, Inc. (WESTON®) and ABC Supply Company, Inc. (ABC Supply).
  • The plant modules will be installed Wm. Kramer & Sons Roofing and Sheet Metal.



Summer Semester
May 13-August 27, 2017

M-Th: 8am-7pm
Fri: 8am-5pm
Sat: 10am-5pm
Sun: Closed

Days Closed (Summer):
Sat., July 1; Tues., July 4;
Sat., July 8; Sundays

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