What roofing materials work best for a rainwater system?
For general irrigation purposes, any roof material is fine. For vegetable gardens and fruit trees, metal, tile and asphalt shingles are all acceptable surfaces for water catchment. Treated wood shingles and older tar/gravel surfaces could have contaminants and are best used for non-edible vegetation. If you have specific concerns, a local soil lab or plumbing company can test your system’s water quality.
