Getting ready to gut two bathrooms – replacing all fixtures and floors.
Should the CBU for the floors be run under the tub?
The house was built in 1902 so unless someone has placed plywood in the floors in aprevious renovation, there is likely 1x subfloor sheathing running on a 45 to the joists. Is this acceptable to place CBU on? Span is only 10 feet or so. Any moisture barrier recommended under the CBU?
Replies
I assume that you'lll be tiling the floor (you don't say)? If yes, the 1x planking is not likely to be stiff enough for ceramic tile, the CBU won't add much structural strength. ( Not sure I understand SF running at 45 Deg to joists? ) So you need to beef up the subfloor, maybe by glueing and screwing down at least 1/2" ply.
Assuming you do that, the right way to install CBU on a floor is to embed it in thinset and fasten it down to the sf. Can't use poly here as a moisture barrier. How wet will this space get, any intention to flood it ?(as in a shower stall)
Thanks for the reply sharpblade. You assumption about the 45 degree angle of the subfloor was correct - sorry I wasn't clear. I'm not sure myself as to the orientation of the subfloor boards yet.
Their will not be a tiled shower floor in this bathroom which will be flooded.
I bought this house at an auction a few weeks ago and don't want to get too crazy with it. It's a great house - about 6000 SF on 3 floors. Needs 2 bathrooms redone, kitchen makeover, and tons of floor refinishing and painting/wallpaper. Floors are white oak on the first floor, heart pine on the second, and I think some sort of pine on the 3rd floor. I don't have possession of the house yet, but I'm trying to plan things out so I can hit this project hard after the 1st of the year. I'd lke to have it ready for resale by June.
If you're going to replace all the fixtures, go ahead and add a layer of plywood and do the entire floor. It will add a little support ubnder the tub/shower, and it will raise the tub an equalt amount so the new flooring doesn't seem too high.
Whenever you are asked if you can do a job, tell'em "Certainly, I can!" Then get busy and find out how to do it. T. Roosevelt
I agree with you Ed about covering the entire floor with plywood.
How about running the CBU under the tub (just slightly beyond the edge) or just adding another layer of 1/2" plywood there so floor doesn't seem too high?