RE: FCI Article " A constant relative humidity means there is no expected expansion or shrinkage after being acclimated to the particular environment condition".

Whats your point ? The wood was going to be installed straight out of a warehouse, and on top of that , without the HVAC up and running. I could be wrong, but I dont think the warehouse is the environment of the particular environment in the home. Without everything "fired up" you cant control levels of consistancy for wood to acclimate to those levels.

This is the Carlisle method and works fine. One uses cartridges or sausages of a quality urethane adhesive ( SIKA works great ). My method for gluing and nailing wide plank to wood subfloors.

1) Interior temp and humidity to be at normal living conditions. 65 to 75 degrees F and 45 to 50% RH. Flooring to be at no less than 7 % MC and no more than 9%. Average 8% MC.
Subflooring to be at 10% MC. 8 mil black polyethylene laid on earth in crawl space covering 100% of earth.
2) Subfloor to be flat to 1/4" within 10' radius. Make all subfloor repairs necessary. Undercut jambs and casings. Sand all seams flat. Sand entire subfloor with a buffer and 40 grit disc to clean off dirt and promote good adhesion of adhesive. Vacuum subfloors.
3) Install plank by running 1/4 beads of adhesive 8" OC perpendicular to the direction of the flooring.
4) Nail every plank within 2" of end butts and 8" OC using. Face-nail sparingly when you cannot blind nail. Clean off adhesive as you go. Dried urethane adhesive is real hard to remove.

Would you also sand new Advantech that has never been wet?

Thanks,

Tom

If it is clean, no. But usually, most subfloors have gotten very dirty during construction. The dirt has been ground in. The sanding with a buffer is to help remove the top layer of dirt and expose some wood for the glue to adhere to. If one is installing new plywood underlayment over the existing subfloor, it is usually very clean and then, no sanding would be needed.

Thanks everybody here for your help. I've gotten 3 estimates and will be selecting someone soon. Each of them are glueing and nailing, all come well recommended. The a/c should be finished on Wednesday, wood delivered just after that, and then install the following week.