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Q. What about used tires out-gassing into the house? Don’t tires do that?
A. Any gas produced by used tires in this application will have to go through at a minimum; a moisture barrier of 6 mil construction plastic film and at least 1" of stucco (cement) or adobe plaster, with nothing forcing it to do so (static pressure, both sides of barrier). NOTE: The surface of used tires has been subjected to years of exposure to oxygen by high speed rotation in the atmosphere. This exposure causes a phenomenon called oxidation. Oxidation 'interlocks' the surface molecules with oxygen and 'out-gassing' (fly-away molecules of synthetic rubber) is considerably limited, if not stopped completely. It's the new tires that stink/outgas, they just need to “rust” for a while, before they are suitable for use as a building material.
and from several places.
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