If it weren't for that we'd have done it.
With interior damp the symptoms are the problem, so no symptoms = no problem. Exterior is different, too much wetness can cause spalling. Sometimes that's due to incorrect detailing.
NT
IME, masonary is normally quite dry, or off-the-scale wet, and it's not difficult to reconcile those two. The more interesting challenge is to identify where moisture is coming from, if it's present somewhere where you wouldn't expect it to be.
Moisture content of timber is more variable, and it's well defined what types of rot can establish themselves at different moisture levels. Knowing how long timber sits at an elevated moisture content is also important for assessing risk of rot, and that means keeping an eye on it over a period of time.
Keeping it under water for a year or so seems to have benefits :-)
They are good at detecting differences if you take a reading,do remedial work then take readings later they will tell you if things have changed
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