Wow, both of those are wrong. Despite what the installer claimed the rh was, could have been raining. But still at time of inspection a 6 % reading is normal for your zone considering the current temp and rh of the home. Yes the wood can delaminate if not manufacturerd in accordance with astm standards, meaning cheap foreign made engineered junk. Also quoting Vanier; 60° – 80° F and relative humidity between 35 - 55% R. H...... If your within 5% rh your wood should not delaminate if it is a quality wood product. Even then if it is not manufacturerd to that standard I quoted above, why are they selling it in a dry zone where the manufacturer knows it cannot function properly? They have the responsibility to sell a product that will function properly in your zone.
And they said the subfloor is to dry, so the concrete is to dry. LOL What a joke.
The more I read that the more I get confused,
Quote:
i. What is the moisture reading of the sub-floor (if available)? (Ranged from 1.9% - 2.4% At Time of Install)
So many conflicting things in those it's stunning.