Bathroom remodel: walls and floor prep - DIY Home Improvement ...

Hello eveyone,

I plan to remodel my bathroom in a 30 year old house. I moved to the States couple years ago and amazed how far you can go on your own whe repairing your house! So I decided to give it a try, and while researching found this fantastic forum.

I have a bathroom with painted sheetrock walls and vinyl floor. I want to tile walls top to bottom, to tile floor and to replace a tub. Optionally, I was thinking of installing heated floor as
well. Tub replacement I plan to leave to professionals, the rest I want to tackle myself. Also, I want to replace the door. I have a pretty good idea on how to lay tile (did it before), but the walls and floor preparation is new to me.

The course of action:
1. Remove all fixtures, vanity, toilet, door and door trim (pretty straightforward)

2. Cut the sheetrock with circuliar saw (1/4 in?) as close as possible to the ceiling. I don't want to do anything with the ceiling, and not sure how to remove the rest of sheetrock. Would that
work? Also, this will mean that topmos tile will partially be adhered to sheetrock. Is it reasonable to do?

3. Remove vinyl and see the condition of underlayment. When I look in the register opening I see there is a vinyl, some thin layer under it, then two layers of plywood (underlaynet and subfloor).
From crawl space I see that there are patches under the bathroom, so I suspect that subfloor may need a repair. How do I repair the subfloor? My thinking is to use a circuliar saw to cut out the
piece of damaged subfloor up to nearest joists, and replace it with the neew piece of plywood. In this case, do I need to leave 1/8 in between old and new pieces of subfloor? Do I need to seal this seam? What if I don't
have an accessible joist? Do I make it up from the crawl space by using a 2x4?

4. Important: now my vinyl is flush with carpet in the hallway, if I remove vinyl,install backerboard on top of underlayment and put tile, bathroom floor will be considerably higher. How can I avoid
that? Can I remove plywood underlayment and place a backerboard instead? Or I have to keep the underlayment intact? If underlayment can be removed, I may consider adding heated floors, otherwise it is goingto be too high.

5. Install the new bath (wouldn't do it myself)

6. (Optional) Install and hook up heated floors (hook up done by electrician).

7. Install vapor barrier (polyethilene). Tuck the top part under sheetrock. Should it go under the tub lip?

8. Install floor backerboard. Spread adhesive thinly on subfloor/underlayment and put backerboards.Leave 1/4 in on perimeter, 1/8 in between the lists. Screw backerboards to the subfloor after
placing all sheets. Do I need to screw to joists, or just screwing to subfloor is good enough? If I need to screw to joists, I need to make sure that seams are on the joists then. Last step is to seal the seams.Also, is it easy to do holes in backerboard (e.g. for toilet pipe?)

9. Install wall backerboard (screw to the studs). On the walls, top is tight with sheetrock (see point 2), not sure about the bottom. Should it be 1/4 inch from subfloor (so that it is level with floor backerboard?) Wall backerboard should be 1/4in from the tub lip.

10. Install new door casing and trim. (Which is a task by itself, but not a subject of this post)

Phew, thanks for reading that far. It seems at this point I will be ready to start putting tile. Does the sequence of steps above makes sense and do I miss any steps? Any feedback is highly appreciated!

Source: http://www.houserepairtalk.com/f45/bathroom-remodel-walls-floor-prep-15571/

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