I did an inspection for a seller yesterday and in the kitchen there is a slight dip in a section of the floor near a door opening. The floor is ceramic tile. I went into the basement and put my level on all the associated floor joist in this area and they are all level. No indication of any cracks or defects in any of the joists.
After talking with the homeowner (they installed the floor) they mentioned that they may have went thinner on the thinset in this area. It is my opinion that this is most likely what happened…uneven thinset under the tile in this area. They were probably trying to hurry to get the job finished, since they were near the end.
You really can’t feel the dip unless you knew it was there and felt for it. It is visually noticable as you walk into the kitchen from the family room. Although, the door trim on the left side was cut too short (it is about an inch+ above the floor). I am thinking that this gap drawers your attention to the floor area where you can then see the dip. I would bet that if the trim went to the floor it would probably be a lot less noticable.
Anyway, the question is, would you refer this for a structural engineer to evaluate?
Thanks for any help.