Our house is being remodeled, and our spec calls for 3/4" t&g under new flooring. The house was built in '79 with 1/2" plywood, which we guess is t&g, but I don't know how to tell. Later, someone installed another 1/2" on top. On top of the second layer was tile in a hallway and a bath, and carpet in bedrooms and living room. Now we are putting wood in the front hall, new master suite, an upstairs bedroom, and the upstairs hall. The top layer of plywood was removed in the upstairs and downstairs hall and the whole master suite. We have a new staircase, which was installed and set on the 1/2".
So now, the bedroom upstairs and the living room next on the first floor hall are 1/2" higher than the hallways they are next to. We'd rather not have transition moldings if we don't have to. More importantly, we aren't comfortable with the 1/2" under the new wood floors. The flooring contractor & others have said is 1/2" isn't suitable, and while we tend to agree, we don't know if we are making too big a deal of it. We think our contractor didn't read the spec, or didn't realize we had 1/2" subfloor. Bottom line, he says 1/2" is fine.
We are practically rebuilding our house, including new cedar roof, all new windows, three new bathrooms, new siding, a front porch, six dormer windows. Given how much money we are investing, we aren't happy about not upgrading to a better subfloor while we have the chance. I think we'd need to uninstall the stairs so we can either add 1/4" t&g on top of what is there, or remove the 1/2" and replace with new 3/4". We can only have a difference in riser height of 3/8" along the entire run of stair, so that means we can't add 1/4" to the upstairs and downstairs.
Is it unreasonable for us to hold to the contract, and ask for the stairs to be pulled out and reset, so the subfloor can be corrected? Could our floor be bouncy if we leave things as they are, and is this something that could get worse over time? Just trying to put this in perspective. Is it understandable that the contractor didn't pick this up, or should he have realized what the spec called for, and that a house the age of ours would not have 3/4" t&g?