Homeowner wants to use removed asphalt fiberglass shingles as weed barrier under rock near house foundation in California high desert. Sloping away from house, minimal rain.
Pollution: Shingles leach petroleum compounds into soil—not their intended purpose.
Asbestos risk: Older shingles may contain asbestos.
Legal disposal: California law regulates shingle disposal. Follow local regulations.
Use proper landscape fabric, thick mulch, or no barrier with pre-emergent herbicide. Protect your soil and groundwater.
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