[GSBN] Perms and Grains?

Chris Magwood chris at endeavourcentre.org
Mon Sep 1 15:28:08 CDT 2014

Hi all,

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?



Chris Magwood
Director, Endeavour Centre

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