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ISO 9001:2008 Certified Management System
AIA Continuing Education
   

Instructions :

1)   Enter the Perm Rating of the vapor barrier / retarder of choice.
(Example: 0.3 Perm)

2)   Enter the area in square feet. (Example: 1,000 sq. ft.)

3)   Enter the time frame in hours. (Example: 24 hours)

 

The result will be the amount of transmitted water through the vapor barrier / retarder in a variety of units to provide an easy to understand perspective.

Vapor Barrier Perms:
Area in Square Feet:
Time in Hours:
Vapor Pressure difference: 0.2 psi
Result: Transmitted Water Volume
(after condensation)
Unit Quantity
l, kg
ml, g
lb
tsp
tbsp
oz
cup
pt
qt
gal
See why PERM & IMPACT
are both Critical Componets
 



 
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