Roof study reveals health dangers of harvested rainwater International News News | Click Green
The study, led by civil, architectural and environmental engineering Assistant Professor Mary Jo Kirisits, showed that, of the five roofing materials tested, metal (specifically Galvalume), concrete tile and cool roofs produce the highest harvested rainwater quality for indoor domestic use.
The study also showed that rainwater from asphalt fibreglass shingle roofs and increasingly popular “green” roofs contain high levels of dissolved organic carbon (DOC).
Although other potential pollutants can be significantly lower on green roofs (turbidity and aluminum), the high DOCs are significant where these roofs would be used for potable rainwater collection.
Water with DOC is not necessarily dangerous on its own, but Kirisits said when it’s mixed with chlorine – a common product used to disinfect water – the two substances react to form byproducts that potentially cause cancer and other negative human health effects.
Roof study reveals health dangers of harvested rainwater International News News | Click Green
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