How do I replace rotten underlayment when remodeling a tile shower?
Snootch asked:
I am remodeling a shower/tub area. I removed the old tiles and the wall underneath is in good shape except for the tub lip which is rusted away. Some of the greenboard looks rotten near the spout and valves. What do I replace the old board with (it is 20 years old)???
The green paper came off with the tiles, what do I put down on the good areas before putting the mastic down? Roofing paper?
If I put down cement board, do I put paper over it before I put down the mastic? What should I use to level the wall once the cement board is down? Thanks SO much!
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You need to remove the bad board for sure, just to inspect for further rot within the wall. I would then use cement board as a replacement. Instructions on cutting and application are on the board. Very easy!!! Good luck [who]
replace the bad green board with new, then put cement backboard on top of the green board. That way you have a nice raised tile surface, which looks far better than just flat against the wall. You don’t put any paper of any kind over the greenboard or the cement backerboard. [who]
Also, make sure you put a rust stopper on the tub lip to keep the rust from spreading under the tub enamel finish and corroding the tub.
If you don’t, later you could find the enamel flaking off and not be even able to reglaze it because of the rust. [who]
Remove the board. Greenboard should never be used for shower walls. It should be used in the rest of the bathroom, but not where it will be in direct contact with water (even under tile). Under the tile you should use concrete board.
I am an architect and would never do it in greenboard, let alone using old faceless greenboard. [who]