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THE THERMAL PERFORMANCE AND LIFE CYCLE ASSESSMENT OF A GREEN ROOF IN PITTSBURGH, PENNSYLVANIA

Kosareo, Lisa M (2007) THE THERMAL PERFORMANCE AND LIFE CYCLE ASSESSMENT OF A GREEN ROOF IN PITTSBURGH, PENNSYLVANIA. Master's Thesis, University of Pittsburgh.

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    Abstract

    A green roof, a roof with a vegetative cover, is one passive technique that can be used to address environmental issues in an urban setting. Research has shown that green roofs can be used to mitigate numerous urban problems such as storm water runoff and the urban heat island effect. Green roofs can also increase the life span of roofing materials. By adding additional layers to the roof, the performance of a rooftop can be greatly enhanced.A 12,300 square foot extensive green roof was constructed at a commercial site in Pittsburgh. A conventional gravel ballasted roof covers the remainder of the building. The green roof consists of a drainage layer, 5.5 inch thick layer of soil substrate, and vegetation. Using the conventional roof as a control, a monitoring system measured performance parameters of temperature, net radiation, relative humidity, wind speed, and wind direction.The data results clearly show the effect the respective roof coverings have on the roof membranes. The gravel ballast covering the membrane on the control roof cannot protect the membrane from ambient conditions or radiation. The green roof works effectively during the summer and fall, when the high ambient temperature is greater than 65°F and high incident solar radiation is greater than 400 W*m-2 net. For example, on August 25, 2006 the ambient high was 90°F, the low 70°F. The control roof membrane reached an afternoon high temperature of 130°F and a low temperature of 65°F. Meanwhile, on that same day at the green roof membrane high temperature was 86°F and 73°F at night. While the green roof outperformed the conventional roof during the summer and fall, during the winter they perform equally. An Environmental Life Cycle Assessment was also used to determine the effect of roof type on the overall environment. A conventional, extensive green, and intensive green roof were modeled. The extensive green roof impact was roughly 50% less than the control roof in a variety of environmental damage categories. The intensive green roof actually varied with each damage category, from 10% to 44%. Still, green roofs were the environmental preferable choice.


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    Details

    Item Type: University of Pittsburgh ETD
    Creators/Authors:
    CreatorsEmailORCID
    Kosareo, Lisa Mlmkosareo@gmail.com
    ETD Committee:
    ETD Committee TypeCommittee MemberEmailORCID
    Committee ChairRies, Robertrobries@pitt.edu
    Committee MemberDzombak, Daviddzombak@cmu.edu
    Committee MemberNeufeld, Ronaldneufeld@engr.pitt.edu
    Title: THE THERMAL PERFORMANCE AND LIFE CYCLE ASSESSMENT OF A GREEN ROOF IN PITTSBURGH, PENNSYLVANIA
    Status: Unpublished
    Abstract: A green roof, a roof with a vegetative cover, is one passive technique that can be used to address environmental issues in an urban setting. Research has shown that green roofs can be used to mitigate numerous urban problems such as storm water runoff and the urban heat island effect. Green roofs can also increase the life span of roofing materials. By adding additional layers to the roof, the performance of a rooftop can be greatly enhanced.A 12,300 square foot extensive green roof was constructed at a commercial site in Pittsburgh. A conventional gravel ballasted roof covers the remainder of the building. The green roof consists of a drainage layer, 5.5 inch thick layer of soil substrate, and vegetation. Using the conventional roof as a control, a monitoring system measured performance parameters of temperature, net radiation, relative humidity, wind speed, and wind direction.The data results clearly show the effect the respective roof coverings have on the roof membranes. The gravel ballast covering the membrane on the control roof cannot protect the membrane from ambient conditions or radiation. The green roof works effectively during the summer and fall, when the high ambient temperature is greater than 65°F and high incident solar radiation is greater than 400 W*m-2 net. For example, on August 25, 2006 the ambient high was 90°F, the low 70°F. The control roof membrane reached an afternoon high temperature of 130°F and a low temperature of 65°F. Meanwhile, on that same day at the green roof membrane high temperature was 86°F and 73°F at night. While the green roof outperformed the conventional roof during the summer and fall, during the winter they perform equally. An Environmental Life Cycle Assessment was also used to determine the effect of roof type on the overall environment. A conventional, extensive green, and intensive green roof were modeled. The extensive green roof impact was roughly 50% less than the control roof in a variety of environmental damage categories. The intensive green roof actually varied with each damage category, from 10% to 44%. Still, green roofs were the environmental preferable choice.
    Date: 25 September 2007
    Date Type: Completion
    Defense Date: 16 July 2007
    Approval Date: 25 September 2007
    Submission Date: 22 May 2007
    Access Restriction: No restriction; The work is available for access worldwide immediately.
    Patent pending: No
    Institution: University of Pittsburgh
    Thesis Type: Master's Thesis
    Refereed: Yes
    Degree: MSCE - Master of Science in Civil Engineering
    URN: etd-05222007-222606
    Uncontrolled Keywords: LCA; temperature profile; thermocouples; urban heat island; benefits of green roofs; life cycle inventory; green roof
    Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
    Date Deposited: 10 Nov 2011 14:45
    Last Modified: 13 Jun 2012 09:31
    Other ID: http://etd.library.pitt.edu/ETD/available/etd-05222007-222606/, etd-05222007-222606

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