My wife and I bought a 8 year old log cabin last year that needed a lot of work. Currently we are trying to redo the floor for our loft. The flooring is 2 x 8 T&G yellow pine and was nailed and glued to the rafters (which are 4" x 8", 32" on center). The reason we are redoing the floor is because just about all the boards are cupped and there are up to 3/8" gaps between the boards (the tongue and groove separated).
At this point, we have taken down all the flooring and put it through a planer to get the boards flat again. Now I am trying to figure out what to do with the tongue and groove in order to get them matched up again. My thoughts are to increase the width of the groove and then use felt/tarpaper to wrap around the tongue so when I put the boards back together, I will get a snug fit with no creaking. Any thoughts would be greatly appreciated. Also, do I want to glue the floor down again (and nail/screw).
As for starting installing a new floor... this is not an option at this point - we already put waaay to much into this place!