How it is done
Grid the room
Readings at edges, at plumbing walls, at exterior corners, and in the middle — not one heroic number.
Compare to the material
Boards have a moisture content. The room has one. The gap between them is the risk.
Write the decision
Install, wait, change to engineered, or refuse. A smile is not a moisture plan.
Correct when
Every install and every refinish that might have a leak history.
Wrong when
Never skipped because the client is in a hurry.