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<p>[QUOTE=&quot;GeorgeM, post: 3397308, member: 28550&quot;]NT</p><p><br /></p><p>I also was of the opinion that slabs are relatively air tight. However, plastic is porous, so even if they are acoustically sealed 100%, I could see how some gasses would be able to pass through. </p><p><br /></p><p>Has anyone ever measured just how porous they are? Is there a filtration level where certain compounds are unable to pass, but others are?[/QUOTE]</p><p><br /></p>

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