We've been experiencing an issue across the floor on one half section of the house where there are discoloration spots across the floor. Moisture meter reads high- anywhere from 40-80% on spots with discoloration and 8-20% on rest of floor. Floor sits on concrete slab. The material of floor is Engineered Wood.
What baffles us is there's no plumbing underneath floor- all plumbing is above ceiling. Even irrigation drains run around the house, i.e. on sides parallel to house not directly under floor. There's no buckling of floor/seams or uneven ness.
So I'm looking for some help to find out what could be causing this issue. Any help is appreciated.
See pics (sorry for reflection from sun).
