[GSBN] Perms and Grains?
chris at endeavourcentre.org
Mon Sep 1 15:28:08 CDT 2014
I'm trying to compare the permeability of two different sheathing
products. One tells me that it is rated at 37 imperial perms and the
other says it is 5 grains/h-ft2-in (Hg min).
Can anybody tell me what the second rating means, and how it might
compare to imperial perms?
Director, Endeavour Centre
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