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Perm Calculator

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
CLICK HERE