hank mitchell wrote:
i am now planning on installing a second subfloor directly on top
of the original wood floor (There is no true subfloor, there is an
existing tongue and groove 2 1/2" hardwood strip floor nailed
directly to the joists)

I will use 3/4 plywood and just nail it directly down - any
suggestions/pitfalls?

1. Use tongue and groove ply

2. Stagger the ply joints. Take a 12x16 room for example...
4x4, 4x8
4x8, 4x4
4x4, 4x8
4x8, 4x4

3. Fasten securely.
a. Try to get ply edges over joists and fasten through ply and strip
floor into joist.
b. Fasten other areas of ply to strip floor
c. Don't skimp on fastenings

4. Do a good job on the sub-floor...it will make the laying finish floor go
much better and help avoid potential problems with it later.

--
dadiOH
_____________________________

dadiOH's dandies v3.0...
....a help file of info about MP3s, recording from
LP/cassette and tips & tricks on this and that.
Get it at http://mysite.verizon.net/xico
____________________________