2015/056: Regarding the compliance of asphalt roof shingles to roofs where the rainwater is harvested and used as potable water
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The authority has applied for a determination on whether asphalt shingles are suitable for use in situations where rainwater is to be harvested from a roof and used as potable water.
The authority is concerned that asphalt shingles may leach chemicals and particulates that, if consumed, may be potentially harmful to human health. The component of these shingles that is of particular concern to the authority is the asphalt binder, which is common to all the designs.
The matter for determination therefore is whether asphalt shingles, when used as part of a potable water supply system, comply with Clause G12 of the Building Code (First Schedule, Building Regulations 1992) in respect of chemicals or particulates leaching from the asphalt.