Minimum foam board thickness over OSB

Started by Arky217, January 10, 2011, 11:47:48 PM

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Arky217

For a mixed humid climate (Arkansas),
what would be the minimum thickness or R-value of foam board over OSB wall sheathing to prevent condensation in the colder months on the inner surface of the OSB when the wall cavity batts are R-19 ?

Thanks,
Arky

MountainDon

Just because something has been done and has not failed, doesn't mean it is good design.


bayview

#2
   Really a wealth of information on the Building Science site . . .

   I was surprised that air conditioned spaces shouldn't have any type of vapor barrier . . .    Since A/C dehumidifies the home.

/.
    . . . said the focus was safety, not filling town coffers with permit money . . .