I'm a competent amateur woodworker, http://bmacgillivray.ott.istop.com/woodprojects/projects.html and have done my fair share of home renovation projects but I've never installed hardwood flooring before. I've read up on it on a few web sites and perused the flooring book from the Borg and in all cases they suggest runing the flooring strips at right angles to the joists. Esthetically, this will not work in our house.
The current subfloor is 3/4" osb and is in ok condition. I read someplace that to install the flooring parallel to the joists an extra 1/2" plywood layer would be a good idea. Is this necessary or is is overkill?