I live in a 115 year old house that has existing 3/4 tongue and groove floorboards. While they seem sturdy, they are super ugly and have worn very unevenly, and unfortunately sanding won’t be a solution, due to many nails, knots, etc.
I would like to install new hardwood over it, but I want to make sure everything ends up flat and clean looking. I also have new carpet installed in several rooms and want to keep the flooring somewhat at the same height.
I will definitely sand everything to get it flat, but the floor is a lost cause. It was never ‘high-quality’ necessarily. While I don’t doubt I can get it flat, it has some holes drilled in it, patches here and there, and it is not a ‘beautiful’ wood grain, and very plain looking. The tongue and groove are also cut in such a way as to have a noticeable, if very small gap. I’m hoping a thin plywood will add something to the stability, but maybe that’s naive of me.
Assuming I sand everything flat, and use something like liquid nails and 1/4 plywood, will this be sufficient to get a solid, relatively squeak-fee and solid base to attach new nail-down hardwood?
Key detail here is how will this attach best:
What’s the best attachment method for the plywood to existing wood floor? Would screws sit too high (not sink enough in 1/4” ply?) or should I use nails? (Either way I am unsure of size and type) Will the 1/4 plywood be rigid enough?
I also had someone say take out the whole floor and install new 3/4 plywood subfloor, but that honestly sounds time consuming, destructive and like a terrible solution.
What’s my best bet here?
Also, if my original floor is flat after sanding, is the plywood pointless? Should the new floor just attach directly?