Any one who had their solid hardwood floor glued down? Any problems? Speical technique? Recommended, Ok, or avoid? Brazilian Cherry glue down?

Whenever possible you should avoid this. Also remember Brazilian cherry is an "oily" wood and some may say more difficult than most to hold the glue over time due to this.

Art

Gluing random length 3/4" solid hardwood is not an accepted method with the NWFA. Gluing shorts is. Finding shorts nowdays is getting very difficult because they include them in random lengths now. You could mill your own.
There are a variety of issues/problems. Expansion/contraction of Brazilian Cherry would be at the top.

We're doing a 3/4" solid Br. Cherry over crete here. We sealed the crete with Chemrex sealer ($190.00/5 gal.) that is a two part epoxy style sealer then Used the Polyurethane based Chemrex glue ($150.00/5gal.) to install treated 3/4" Plywood T&G subfloor to the crete then put the concrete adaptor on my portanailer and install as usual and still used a moisture bar. between treated ply and wood floor. There's definitely a height issue if your project can do with it ... and this subfloor added about $3700.00 to the price of this 1400 ft job.

Hope that helps,



PS Follow instructions on those Chemrex products TO THE LETTER!

A little warning about using treated plywood...

It will have higher then normal moisture content! We were warned in inspector class about that.

It can cause cupping, and in exteme cases a buckle.

Agreed--spooky to say the least

Would it be better to use an un-treated approved ply?

IMO, there is no reason to use treated plywood as a subfloor over concrete. If you are using a moisture sealant for the slab, that should keep the plywood from getting damp. My preferred method is to install an inexpensive sheet vinyl floor over the slab then glue and nail the 3/4" CDX to that . The glue is use I Franklin Advantage (used to be 811 plus) a moisture cured urethane that is DESIGNED to be applied over vinyl moisture barriers. Once your ply is down, then treat it as a normal subfloor except use shorter fasteners and cover with the 15 lb. asphalt felt. You'll be good to go then.