I am adding on to an existing structure. The existing house has a concrete floor on the first floor of the structure. The plans specify using I-joist for floor joist with 3/4″ t&g plywood subfloor. I will be bolting a ledger board to the existing foundation and using joist hangers to attach the the floor joist. My concern is the transition from the concrete floor, to the wood floor. The joint will span right through the middle of the kitchen. I am certain the two surfaces will expand and contract at different rates causing problems with the finished floor. Especially if the client uses tile or stone. I welcome any suggestions.
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Where are you, how big is the addition, etc...a few more details please. Any chance you could pour a concrete slab for the addition?
Do it right, or do it twice.
This is a job for whoever drew the plans.
The very word plans implies that somebody did some planning. But in this case, they failed to do the whole job. Let them finish their job before you start yours. They gave you drawings for something undoable or incomplete. You are not sure what the finished floor is to be so it is impossible to do the framing and subfloor right without knowing where you want to end up.
That's like going on a trip and just jumping in the car and taking off. It's a good idea to know what city you want to end up in before you point your car out the driveway.
Excellence is its own reward!