5.1 : Building Materials/Insulation
| 5.1.5 |
Properties of
Cool Roofing Materials (1) |
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Solar Reflectance (2) |
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Infrared Emittance (3) |
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| Asphalt
Shingles |
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| Shasta White |
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0.26 |
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0.91 |
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| Generic White |
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0.25 |
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0.91 |
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| Generic Grey |
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0.22 |
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0.91 |
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| Light Brown |
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0.19 |
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0.91 |
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| Medium Brown |
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0.12 |
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0.91 |
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| Generic Black |
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0.05 |
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0.91 |
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| White Coatings |
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| White Coating
(1 coat, 8 mil) |
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0.80 |
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0.91 |
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| White Coating
(2 coats, 20 mil) |
0.85 |
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0.91 |
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| Aluminum
Coatings |
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| Aluminum |
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0.61 |
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0.25 |
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| Fibered on
Black |
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0.40 |
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0.56 |
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| Membranes |
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| Gray EPDM (4) |
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0.23 |
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0.87 |
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| White EPDM (4) |
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0.69 |
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0.87 |
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| T-EPDM (4) |
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0.81 |
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0.92 |
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| Light Gravel
on Built-Up Roof |
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0.34 |
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0.90 |
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| Metal Roof |
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| New, Bare
Galvanized Steel |
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0.61 |
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0.04 |
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| Tiles |
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| Red Clay |
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0.33 |
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0.90 |
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| White Concrete |
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0.73 |
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0.90 |
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| Fiber Cement,
Pewter Gray |
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0.25 |
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0.90 |
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| Note(s): |
1) A
good cool-roofing material has high solar reflectance and high infrared
emittance. 2) Solar Relectance is the percentage of incident solar radiation
that is reflected by the material. 3) A number between 0 and 1 that describes
the ability of a material to shed heat. The lower the value, the more heat
the material retains. 4) Ethylene propylene diene monomer rubber material. |
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DOWNLOAD TABLE AS PDF XLS
Related Tables:
Sources:
Lawernce Berkley National Laboratory, Cool Roofing Materials Database, http://eetd.lbl.gov/coolroofs/
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