Do I need to remove all plasterboard?

L

lost_diyer

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I’m renovating my bathroom and installing tile backer board on several walls where tiles were removed. There are two other adjoining walls with moisture resistant plasterboard. Should I remove the plasterboard from these walls as well, or can I leave it and tile over it?
 

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If it’s not in a shower area but is just a splashback over a sink, or where tiles are just decorative, then moisture resistant plasterboard is fine.
 
A friend of mine is having his bathroom done and the builders are using moisture resistant PB....i told him a proper shower board like Elements would be better. Builders disagree / cant be bothered!!!!!
 
koolpc said:
A friend of mine is having his bathroom done and the builders are using moisture resistant PB....i told him a proper shower board like Elements would be better. Builders disagree / cant be bothered!!!!!
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I agree with you that cement based boards are better and it’s what I would use in a shower. However, MR plaster board is in most instances sufficient and if I were your mate I wouldn’t worry. There are plenty of 1980s bathrooms with showers over baths tiled on ordinary PB with no problems after 40 years’ service.
 
Agree with Kools: MR still gets mushy when it gets wet, perhaps a bit slower than the normal stuff is all (how do I know?) Next time I'll use cement board fo sure.
 
Just to be clear, I agree that where the grout or seals fail, MR plasterboard can be damaged, which is why I would use cement board. However, I also think your friend doesn’t need to be overly worried - grout is pretty reliable these days and silicone seals can be redone if they are showing signs of failing.
 
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