We are contemplating hardwood floors in an 1860 house we are
renovating. It currently has two layers (1.5 inches total) of pine
floor -- the rough-sawn subfloor covered by painted pine boards.
Everything sits on 2 x 8 joists (older style) set 30" OC.

I'm planning on tearing up the top layer of boards and putting down
3/4 T&G flooring (Advantech). But I'm worried that the amount of flex
(bounce) in the floor from the widely spaced joists will cause
problems down the road.

Has anyone here tried anything similar? What luck?

Thanks,

John