With water quality and quantity concerns on the rise across the US and around the world, local codes use NSF P151 as a requirement for rainwater catchment to allow the water to be used for potable water or landscape uses. Local plumbing code officials should always be consulted for current potable water requirements.
With NSF P151 certification, roofs coated with GacoFlex S20 Silicone meet the safety criteria for rainwater catchment. In addition, if you want to store this resource in a concrete or metal tank, GacoFlex LM60 liquid applied polyurethane membrane meets NSF 61 requirements for potable water storage.
Gaco Western is able to offer a complete system for safe rainwater catchment.