No such thing as waterproof hardwood. A pre finished hardwood floor will have a finished top coat that is better with UV fading and scratching but water will still damage it.

There are waterproof engineered wood floors - "waterproof" = 24-36 hour topical spills (it does not = standing water or active flood situations). OP - I assume this is the type of flooring that you are referring to instead of waterproof hardwood flooring?

If, you are installing over a slab. You need proper moisture control. Cracks should be chased and filled, spallings repaired, hi/lo spots brought into flatness tolerance. Use a compatible moisture control system to the adhesive being used. Even though you are in a dry climate zone. Air will always carry moisture. So, protect your flooring from any air vapor from under. That's one half of your waterproof system.

I do not believe there is such a thing as waterproof hardwoos just a finish that can stand water sitting on it for a bit longer . Not sure why waterproof is even needed . If you have a flood there is actually no waterproof floor even tile will still allow water into the subfloor.. I would heed G&S info if on a slab

Even tile floors are not waterproof!

Are you asking about SPC Rigid Core flooring? It isn't hardwood.

Yes you are all correct it is SPC they market it as "engineered wood". We don't like LVP and tile is so hard, we were looking for an alternative. We wouldn't expect it to withstand standing water, just typical drips in a kitchen, bathroom with adults.

Ask for a sample to test the limits. You can usually talk to a tech person at the company during a slow time. Ask about the country of origin. It would work in a powder room for sure. Possibly a couple deet of tile next to the shower and under a freestanding tub.

We have experience with LifeProof Engineered Hardwood throughout (including bathrooms). It's been over a year and holding up very well.

When I went to our local Home Depot store, they had an extensive display of LifeProof LVP products. I had to look across the aisle into the engineered wood section the see the LifeProof engineered hardwood display.

I have site finished solid hardwood floors throughout my main level + European Oak engineered wood floors on upper level - except for three bathrooms on upper level (where there are showers/tubs) + laundry and mudroom on main level. I do have them in my powder room + kitchen. They've been installed for a LONG time - and only had one issue (refrigerator water line not installed correctly - small area of floor was wet for awhile - floors went back to normal after drying out).

Have you considered installing solid or engineered wood floors throughout your home except for in the bathroom/laundry room areas?