I'm sorry I can't answer your question but I'm very curious, why are you choosing solid over plywood instead of engineered? Is this new construction or are you remodeling? Several floor folks have told me they will not install solid on a concrete slab, engineered is better for our area (Tampa). I guess putting solid over plywood is doing your own engineering, in a way. Are you site finishing the floors?

Would it work to put the same, or thicker, plywood under the tile?

It's remodeling. 17year old house. Mostly because of thickness. 3/4" solid is practically speaking forever although engineered hardwood is one-time-sand. This is what we have currently in the kitchen and it sucks (don't know when they laid it but the surface has cracked and it doesn't look good).

Since the price difference is tiny I don't see any disadvantage of the solid option vs. the engineered. Also nailing is faster and cleaner than gluing.

We're neighbors - I'm from Atlanta. And though is humid here in general surprisingly enough mouisture meter showed only 8% (max allowed is 12%) in the room. I'm also planning to lay 6mil barrier underneath so I'm sure it's gonna be fine. Folks from a local iFloor confirmed my plan as many articles and instructions I've read.

Btw, we're going with Tigerwood from Mazama (builddirec.com) unless iFloor beats them.

I am not a pro, but a homeowner who just recently had tile installed in my kitchen. The tile floor was about 3/4" higher than my Pergo livingroom floor. My tiler took measurements of the transition and had a woodworker/cabinetmaker fashion a solid white oak threshhold for the transition. I didn't know what to expect, but was pleasantly surprised by the outcome. I'll post a picture within a day or two if you're interested (if I can figure out how to post it).

Site finished or pre-finished? DIY?

The quality of engineered wood varies widely. The top layer on good engineered floors is nearly as thick as the area of wood above the tongue and groove of solid, and they can be sanded three or more times. Of course when you're living with floors that look awful I don't blame you for choosing something entirely different!

You must have thought through the issue of door clearances, 1.5 inches sounds like a lot of extra height.

I think the barrier is a great idea, and wonder if you plan to bring it up on the sides - you could prevent the kind of disaster I had where water came in from an adjoining area and under the floors. I never saw the water until the floors were ruined.

Tigerwood is lovely, good luck to you!