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wrestlin 11-30-2010 12:04 PM

expanding bathroom....continuous floor from mudbed???
So I am basically doubling the size of 2nd floor bath by making a doorway in the existing bath and framing out some of the neighboring room for the expansion. I want the bathroom floor to run continuous from the old part through the doorway and into the new part.

My problem is that the existing bath floor is built on a thick mud bed. The new area has t&g sub that I was planning to layer over with plywood and then cement backer board. How can I merge these two floors through the doorway without sacrificing stability for the tiles?

Can I overlay the plywood into the mud bed area and then use levelling cement to smooth everything out?

KCB 12-02-2010 05:34 PM

Whats the hieght difference between the 2 floors or finished grades .

wrestlin 12-03-2010 10:37 AM

after pulling up two layers of tiles and the levelling cement from the orginal floor, the remaining rough mudbed is about 1.5inches lower than the t&g subfloor in the new floor area.

KCB 12-03-2010 06:47 PM

That mud bed may need to come out , is it directly over plywood or whats under it ? If it were me i would scrape it out , then figure out what to use to bring the floor up level with your T&G " be it " lay flat 2x4 stud sleepers then 3/4 or 1/2 "plywood or 2 sheets of 3x4 plywood etc... Then plywood both floors level.The cheaper being using sleepers depending on the size of the existing bathroom.
Also what about your fixtures toilet etc?...
It sounds like a great idea to expand your bath in such a way but it may be a little harder to get it done.If your fixtures are out it'll be easier and the way it should be done .As for your tub or shower depending on what you have .A full tub and shower wall system you could leave it in place or you'd have to shorten the shower walls and flange the P-trap etc...If it were me i would also resize it now for future maintenance issues.It depends on you i guess. Move the sink/vanity and toilet.Reset it when your done.Youd have to re-flange your toilet of course and maybe use a longer drain pipe to the sink no biggy.Alot of things to consider.

wrestlin 12-06-2010 07:42 AM

Everything in the bath is torn out down to stud and the mud bed. The only reason I was going to leave the mudbed is because I have no clue how to get it out. I used a cold chisel and 3lb sledge for the 2+Inches of levelling cement and 2 layers of tile.....but the mudbed (which is about 4" thick and spread across 5 chiseled out joists) wont budge. Its on the second floor too, so every time I wack it with the hammer the joists deflect to absorb the blow.

Below the 4" mudbed are 1x strips of wood (about half way down the 2x10 joists). I would love to get rid of all that heavy cement and do as you suggested to level the floor going into the new bath area....but how the hell to get that cement out?? bigger sledge?

SteelToes 12-06-2010 10:08 AM

mud bed
Hmm... Pay attention to the could have some inside that mud bad slab.
As far as how to remove the slab ...try to cut a few lines across the floor with a circular saw and masonry blade, pound down on one small section with a sledge hammer.
Once you get one section out try to pull remaining out with a pry bar.

wrestlin 12-06-2010 10:32 AM

There actuallt was some plumbing inbedded in the cement (including steam radiator piping that was rusted out and leaking through my first floor ceiling :mad:) but I have everything disconnected.

I will try your suggestion. Thanks!!

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