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Washington State Allows Shingle Use in Hot Mix

Tuesday, 09 March 2010 16:11

After careful review the Washington Department of Ecology has determined the use of asphalt shingles in hot and cold mix asphalt is a safe practice for human health and safety. But in a surprising twist, it became the first known state to determine that using recycled shingles in “loose” form was dangerous, and would require a beneficial use determination to be used in such manner.
The concern centers on arsenic and polycyclic aromatic hydrocarbons (PAHs) “present in levels that may be harmful to human health and the environment…Humans may inhale, ingest or absorb asphalt roofing particles and its contaminants. Wind or precipitation may carry the material into water sources.”

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