3) Water pipe leak under floor slab - A leaking water pipe will also cause moisture to move up through a floor slab and initially mimic the sweating caused by a missing vapor barrier. But eventually the water will start to pond in an area or bubble up from small cracks.
impassive â(comparative more impassive, superlative most impassive) 1  Having, or revealing, no emotion. 2016 May 22, Phil McNulty, âCrystal Palace 1-2 Manchester Unitedâ, in BBC: It was a victory that clearly meant so much to Van Gaal as the normally impassive manager raced from his seat in the technical area to celebrate Lingard's winner. Still or motionless.
3 : free of extraneous matter : pure. 4 : free of impediments to view : unobstructed. 5a (1) : evident to the mind or senses : obvious it's perfectly plain that they will resist (2) : clear let me make my meaning plainb : marked by outspoken candor : free from duplicity or subtlety : blunt plain talk. 6a : belonging to the masses : commonb : lacking special distinction or affectation : ordinary.