Rainwater Harvesting from Eco Roofs: Filtration, Storage, and Irish Best Practices

With the right filters and storage, roof runoff can support garden use and reduce mains consumption.

System Components

• Leaf guards and first‑flush diverters
• Sediment and carbon filters (use‑case dependent)
• Above/below‑ground storage tanks with overflow to soakaway

Sizing Your Tank

• Rule of thumb: 5–7 days of typical non‑potable use
• Consider Irish rainfall patterns and roof catchment area

Green Roof Considerations

• Substrate fines: choose suitable filter train and maintenance intervals
• Access to clean outlets and inspection points

Maintenance

• Quarterly checks of filters and pumps
• Gutter hygiene to protect water quality

Upgrading gutters or outlets? See our maintenance and roof repairs services to prep your roof for harvesting.