1.6 : Embodied Energy of Building Assemblies




1.6.5 Embodied Energy of Other Commercial Roof Assemblies in the U.S.
Embodied Energy CO2 Equivalent
(MMBtu/SF) (1) Emissions (lbs/SF)
Precast Hollow-Core Concrete
EPDM Membrane 0.17 21.23
PVC Membrane 0.26 30.89
Modified Bitumen Membrane 0.26 31.94
4-Ply Built-Up Roofing System 0.44 51.68
Steel Roofing System 0.11 20.24
Precast Double-T
EPDM Membrane 0.15 17.42
PVC Membrane 0.24 27.05
Modified Bitumen Membrane 0.25 28.13
4-Ply Built-Up Roofing System 0.43 47.86
Steel Roofing System 0.10 16.42
Suspended Concrete Slab
EPDM Membrane 0.24 37.32
PVC Membrane 0.33 46.96
Modified Bitumen Membrane 0.33 48.04
4-Ply Built-Up Roofing System 0.51 67.75
Steel Roofing System 0.18 36.33
Open-Web Steel Joist, Steel Decking (2)
EPDM Membrane 0.17 15.28
PVC Membrane 0.26 24.93
Modified Bitumen Membrane 0.26 26.01
4-Ply Built-Up Roofing System 0.45 45.72
Steel Roofing System 0.12 14.29
Note(s): Assumptions: 60 year building lifetime. Low rise building. Values are general estimations for the U.S. All roof assemblies include R-20 continuous insulation, polyethylene membrane, and latex paint. All assemblies are insulated to IECC 2009 minimums for zones 3 and 6. 1) Embodied Energy: Energy use includes extraction, processing, transportation, construction, and disposal of each material. 2) Includes gypsum board.









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