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I'd guess anything less than half a foot would create a microclimate. To be honest there's no smell or visible signs of damp so I'd just put it down to one of those things that happens at this time of year, probably just a little bit of moisture settling in the wall that set the surveyors detector off
Crispin_Glover
Is there an optimal distance for air flow here? We're getting a bit of that at the mo (chair mainly pushed back to be out of flight path of toddler).