Another squeaky subfloor
The main floor of our old (1975) house has 5/8" plywood subflooring, over joists at 16-inch centers. In the kitchen & adjoining dining room, this was covered with vinyl flooring. About six years ago, we wanted to change the flooring, and since the subfloor beneath the vinyl had always squeaked quite a lot, I asked the local building supply from which we were buying the new linoleum what to do to prepare.
They recommended putting extra screws in through the subflooring and into all the joists - at the rate of a screw every six inches. I did that. We followed this by applying half-inch MDF above, and then the lino went down onto that. Absolutely no squeaks.
We're likely to change the wall-to-wall carpeting in our living room this year, and so I wonder about the process for getting the squeaks out there too. I could simply follow the former advice (a screw every half foot), but it's a tedious job and I've wondered if it is actually overkill?