Help Please - Vapor Barriers

[Deborah Burian]

Purchased a property and ditched the deadbeat... you know the one with the 52" flat screen and surround sound that couldn't pay $500 rent? When he moved the TV the drywall collapsed - it was soaking wet from a poorly installed window AC.

I removed the damaged drywall plus a little more to ensure I had removed everything that got wet and discovered that this 1937 plank-sheathed house does not have a vapor barrier at the exterior wall...

Is this a serious concern? Is there a way to fix it?

Any feedback is much appreciated.