Tyvec for separation from contaminated ground?

Thanks to all on this lively newsgroup for the fascinating
discussions,

    Pretty new here myself, so please excuse if this one has been
answered before.

    Does anyone know if Tyvec, the DuPont wind-proofing house
wrap, would be both sufficient & safe to use as a barrier under
raised beds where the urban soil below has lead dust or other
contaminants?  Would Tyvec leach its own chemical contaminants
into the food?

Thank you for any information you may have,
Napi
Grace Arents Community Garden
Richmond, Virginia, USA


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