Quote:
Originally Posted by Shin Pad
I disagree. Layfield plastics which is a major manufacturer of 6 mil poly, lists the perm rating at 0.16 which above 0.1, therefore it is a vapour re-tarder.
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You might be mixing up metric and US perms (Class ratings are based on the latter). Or you might be looking at the thickness in metric (6 mils is pretty close to 0.16 mm).
Regardless, here are test results for Layfield 6 mil poly showing a US perm rating of 0.044 perms:
https://www.layfieldgroup.com/Conten...t_Results1.pdf