Re: subfloor, new construction
ok,, let me clarify this... that last post is pretty vague
basically with older style hardwood they used wood that came in longer lengths which would span 3 joists minimum, even still this is a weak method of intalling hardwood. the floor framing would have to be 12" o.c if not closer together just to prevent deflection and to allow the hardwood to be properly fastened.
newer hardwood comes in random lenghts, usually the longest piece is 6' and short pieces around 12", this creates a random floor which is because the manufacturers make the peices out of whatever they can use from the tree. also a properly installed floor should have the starter and closer strip glued down with construction adhesive so to prevent the last few rows from spreading.. and for fastening a properly fastened floor is stapled roughly every 8 or 12" some guys do as little as possible but these floors end up having issues with movement. you cant get that with hardwood fastened to joists that are 16" o.c or 19.2" o.c
fire up the saw and make some dust