| Roofing Material |
Water Quality Considerations |
| Metal Roofs |
- Runoff may contain high levels of zinc, copper, and lead (see Table 5)
|
| Sheet Roofing (PVC) |
- Recommended for non-potable use only
|
| Tile roofs (clay, ceramic, cement, fiberglass) |
- Need periodic cleaning - debris may accumulate between tiles
- Recommended for non-potable use only
|
Shingles
- asphalt
- composite
- three tab asphalt
|
- Recommended for non-potable use only
- Some shingles manufactured prior to 1980 may contain asbestos in trace amounts
- May not be suitable for irrigation if shingles have been treated for mold eradication or with herbicides
|
| Shingles – cedar shakes/wood shingles |
- Recommended for irrigation only
- Shingles retain moisture, support mold, algae, and insects, may be treated with fire retardant or other chemicals
|
