Solid Hardwood, Engineered and Laminate Flooring - sub flooring??

Hello,

I just removed a glued down Oak parkay floor over concrete on grade. It had no signs of moisture problems. It was glued with black tar like adhesive circa 1967. I razor blade scraped it to clean it.
I have 3/4" t&g solid Jatoba (Brazilian Cherry) that I want to staple down to 3/4" plywood using a pneumatic nailer.
How do fasten the plywood to the concrete?
Do I really need a moisture barrier below the plywood as the previous floor had no moisture barrier?
I was going to use a high tech glue (liquid nails sub floor adhesive) for the plywood and then pneumatic nail it to the concrete. Then use 15 or 30# roof felt above the plywood.
I am so confused :confused:
Thanks,
Scott SS
Stuart, Florida

Nobody knows anything about this????:(

Go to www.installingwoodfloors.com

thanks,
I have seen this site.
How can wood floors be routinely glued directly to the slab in Florida? Now because I am using a subfloor of plywood and nailing down the floor I must go to extremes to prevent moisture?
how is moisture controlled on glue down floors?

thanks,
Scott SS

Have you ever seen moisture penetrate polyurethane? The adhesive is the moisture barrier, to an extent. If the slab has more moisture or pH, then the adhesive will allow, then you have problems. You need to find something besides wood or spend the money to correct the vapor emission problems.

Thanks Perry,
I really wanted to follow the recomendations at www.installingwoodfloors.com but cut back adhesive is not available here in the West Palm Beach Florida area, in fact no one has even heard of it! So there was no way to do it the way they say to.......The previous floor was glued directly to the concrete for 35 years with out any problems.
I decided to used a construction adhesive and pneumatic nail the plywood down. I will use 30# roofing felt on top of the plywood and pneumatic staple the T & G down.
The on grade slab is has one exterior wall and is surrounded by crawl space on the other three sides.
wish me luck,
Scott

Scott:

You could look at my link that deals with exactly what your're dealing with...unless it's too late?

http://www.floridawoodfloors.net/nail.htm

Thanks but its too late. I am gambling that the leftover cut back adhesive in the pores of the concrete will act as the moisture barrier. In addition to the location of the slab in the structure proving for only one outside wall and that there were no signs of a moisture problem with the previous installation.
I ended up using DSI pro 400 adhesive 3/8 in bead aroung hte perimeter and zigged throughout the sheets plus about 144 pneumatic driven concrete nails per sheet. Then 30# roofing felt and rosin paper over that.
I put down about 100 feet of the Jatoba tonight. Wow, is it back breaking work!
No wonder they charge so much to install. I will have a like new Bostitch Floor Stapler for sale when i complete the job, if anyone is interested contact me off the forum.
Thanks,
Scott SS
windsurfer@bigfoot.com