Originally Posted by
Eric Barker
I always use the meter on a relative basis. If I have moisture readings in the ceramic floor away from the toilet I notch the sensitivity down and try it again. Unless I can get the meter to give me a low reading somewhere I am not going to put much faith into what it's telling me.
Precisely the way I used my moisture meters - relative to other like areas, even for drywall walls. Check several like areas 'known to be dry', i.e., where there is no logical reason for them to be other than dry, then compare that to the other areas you suspect problems. Caution though, do not compare exterior walls to interior walls, which is why I said "like areas" - you want the wall construction to be the same (frame/frame or CBS/CBS) and the environment on the other side of the wall to be the same (indoors/indoors or outdoors/outdoors).