Concentrations of Zinc, Copper, and Lead in Roof Runoff Based on Roof Material Type
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Metal | Roof Materials | Runoff Concentration (mg/L) |
---|---|---|
Zinc | New uncoated galvanized steel | 0.5-10 |
Old uncoated galvanized steel | 1-38 | |
Coated galvanized steel | 0.2-1 | |
Uncoated galvanized aluminum | 0.2-15 | |
Coated galvanized aluminum | 0.1-0.2 | |
Other (aluminum, stainless steel, titanium, polyester, gravel) | <0.002 | |
Copper | Uncoated copper | 0.002-0.175 |
Uncoated galvanized steel | <0.003 | |
Clay tiles | 0.003-4 | |
New asphalt shingles | 0.01-0.2 | |
New cedar shakes | 1.5-27 | |
Aged/patinated copper | 0.9-9.7 | |
Lead | Uncoated galvanized steel | 0.001-2 |
Coated and uncoated galvanized steel | <0.0001-0.006 | |
Painted materials | <0.002-0.6 |