Roofing for Rain Collection
Roofing for Rain Collection:
The advances in roofing technology have allowed for several options in metal roofing (the best for rainwater harvesting), including some that have the look of slate, terracotta or cedar shakes, with the benefits of metal.
The safest type of roof for your rainwater harvesting system is a metal roof (galvanized steel), although stone/slate, concrete or terracotta options are possible. Here are some images and we encourage you to do a thorough review of the roofing material if your project includes re-roofing along with rainwater harvesting.
Roof Tips:
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Consider roof coatings: SMP coated metal and polymer roofs to avoid metals leaching into your rainwater.
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Ensure concrete tiles do not contain asbestos.
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Roofs should be washed down after pollen season ends before rainwater collection resumes.
- Gutter Guards are very helpful to reduce debris buildup while conveying water from roof to tank(s).
If you are not re-roofing and simply want to know whether your roof can safely harvest rain for non-potable uses, please see the safe types here below:
Roofing Types
The following are SAFE for harvesting rainwater:
Corrugated Galvanized Steel
https://www.shanghaimetal.com/
Corrugated Galvanized Steel, Enamelled steel, factory-coated
https://www.shanghaimetal.com/
Terracotta
Concrete Tile
Glazed Slate
Here is an excellent resource to distinguish between the roofing types, including those you should avoid for rainwater harvesting:
https://www.918construction.com/types-of-roof-shingles/
AVOID :
- Fibreglass shingles
- Cedar shakes, or shingles
- Bitumen, or composition roofing
Other Roofing Considerations
Does your region have much snowfall?
Consider installing snow rails on a metal roof in order to:
- Prevent gutter damage
- Protect entryways and planting beds located under eaves