You don’t want the wood floor under the pan because if the floor does buckle or warp, you want to pull it out without messing the shower. Also, I would suggest you get a sliding glass door because a regular door will get water on the floor when you open it. Personally, I have boxes of leftover wood in my storage unit and didn’t use it in either of my recent bath remodels because of wetness, though I may consider it in my powder room.

Are you also putting new wood flooring into the bedroom or does the flooring already exist?

I ask because when I remodeled I had new wood floors installed everywhere but the bathrooms. The bathrooms have tile and there is no transition at all becasuse the wood and tile are the same level - it is a seamless transition except for the obvious change in the "look" - e.g. from wood to marble.

I assume that the subfloors were prepared so that the height of the finished floors were the same. I know that my wood floors had self leveling applied as well as cork to soundproof.

it is a brand new open concept bathroom. There was no bathroom before in that bedroom. It is a bedroom in which I am adding a bathroom with no wall separating it from the bedroom (only a curtain separating the two areas). Something like this but with same floor everywhere. As I said, the toilet and sink are wall-hung, so the only things that go on the floor is the shower. I wish they had floating showers ahah. I will start another post about the design of the bathroom. It is a room with a wood subfloor, old solid wood has just been removed. We will install 8" engineered white oak floor in 2 weeks, and now with the contractor we are discussing how to handle the shower pan. Any answer to my 4 questions above would be highly appreciated. Thank you very much!

I would save the wood for elsewhere and put a waterproof type floor in the bathroom.

Note: in the part of the house that is on wood subfloor they are installing Ice and water shield under plywood, then 3/4" plywood and then the wood floor using glue with moisture barrier.

@cat_ky wood is already ordered and shipped. the bedroom will be all woodfloor, with open concept bathroom or without bathroom. There is no saving for me by not laying down the wood and storing it in the garage.

We’ve had an engineered wood floor in our bathroom for 8 years without problem, we do have a tub/shower with a curtain. Floor was laid after and caulked between tub and floor.

"they are installing Ice and water shield under plywood, then 3/4" plywood and then the wood floor using glue with moisture barrier."

Make sure you are not creating other issues with trapping moisture as the method you describe will have two moisture barriers.

And Ice and Water Barrier is typically an exterior product used under roofing...................

Giant technical disaster in the making. No one involved seems to have the faintest clue how to do this properly, or why to not do it at all. Open concept bathroom is a recipe for all kinds of home infiltration from moisture. The cubic volume of space will be difficult to temp and moisture control with a humidity factory inside it. It will need its own very expensive HVAC system. High volume airflow, dehumidifiers, and an ERV etc are required. In addition to a properly drawn out section detail with all of the waterproofing detailed correctly. Which is already effed up. Ice and water shield. OMG. 🙄 Mold and rot are not far behind. And will only get accelerated by this ridiculous bathroom inside a bedroom idea.

@User : thank you very much for raising very good points, appreciated it. The contractor spoke with the city and the city saw no problem with the open bathroom concept, but they said the fan will have to be sized based on the entire room size, of course. My contractor did bathrooms bigger than this bedroom and knows how to size the fan. The fan will have a sensor that will run the fan when humidity is above a user defined % ( I guess 55%?). Why do you think it needs a separate dehumidifier and AC? My friend has a non-open concept bathroom with a wood floor that itself is 17'x17', bigger than my room,which is 15'x15'. My friend huge bathroom has no mold, and it just has a very powerful fan in the middle. Could you please elaborate why this 15x15' room with open concept bathroom should have mold? As for waterproofing, you mean on the pan? Any suggestion for that? Note: here in north Florida there is no ice.

@Creative Tile Eastern CT : had a meeting with my contractor, I ruled out tiled shower floor meeting woodfloor, he said it is crazy. I gonna get this pan and he suggested to put it on top of the hardwood floor, with a thin mud bed. He said that this way the pan will keep the planks from differentially warping. He also said he is fine with cutting woodfloor at the shower pan and put pan on mud bed on top of subfloor, but he would prefer the first options. Thoughts?

@Creative Tile Eastern CT : could you please elaborate on the Fire & Ice barrier? I guess for North Florida is the Fire barrier. What is it?

Guaranteed moldy disaster. Giaranteed. Your contractor is clueless. Or an active con, conning you out of money.

Thank you but could you kindly elaborate, why it would be for that room with open concept bathroom and not for a large bathroom, given the same size and a properly sized fan with humidity sensor? If you explain it would help other people on Houzz not only me, so the mistake is not done somewhere else. Please help.

@User can you please explain why is the humidity sensor with large fan not enough? It would be really appreciated. Thank you very much.

@venexiano I have no idea why a great fan with an automatic system that runs on ambient humidity levels wouldn't be enough to ensure that a bathroom isn't filled with high humidity levels.

I have a bathroom with the Panasonic Whisper Fan with the automatic sensor. It turns on when someone showers and runs for awhile and then turns itself off. I don't have condensation on the mirrors or shower doors and everything is dry. I have no mold either or any unpleasant odors from mildew or the equivalent. FWIW I do keep the bathroom door open except when it is needed for privacy because it is more difficult to open and close a bathroom door in a master for no reason.

That said I have hardwood floors throughout my home except in the bathrooms. I installed marble basketweave tile and the transition is beautiful. Once benefit to having all of the flooring done at once is that all of the transitions are at the same level so there is no piece needed because of height differences of difference floors. I used to have those prior to my remodel in all of the rooms.