Water Resistant Board For Bathrooms
Moisture resistant pb or normal pb?
Moisture resistant pb or normal pb?
Djtemeka
Original Poster
1,434 posts
164 months
Sunday 7th August 2016
Just wandering something today. Using moisture resistant plasterboard in a shower or regular plasterboard.
Of course the MR PB is better than regular but if moisture is getting past the tiles it will hit the adhesive first and break that down and then move onto the plasterboard so you have tiles coming loose regardless of what type of board used so that negates the use of the MR pb in the first place.
I must be missing something here? Right? I've stripped MR PB before after a leak and found it to be unusable again.
Sunday 7th August 2016
I would never use plasterboard in a shower.
If there is any movement, eventually the water will get to the plasterboard, and very soon the plasterboard will be ruined., MR is moisture resistant, not waterproof.
We always replace the plasterboard in a shower with a cement based tile backing board, Hardibacker usually or Aquapanel.
Some people apply a tanking solution over plasterboard, but I would rather not have soft flexible plaster board in a shower zone
Edited by Neil - YVM on Sunday 7th August 10:59
Sunday 7th August 2016
As Neil said, use a proper backing board if you can. I'm not sure what the point of MR plasterboard is TBH. If for some reason you do use it, bare in mind you can't skim it without priming the boards first.
Sunday 7th August 2016
It shouldn't matter what is used behind tiles.
If the job is done properly, water will not get through anyway.
Sunday 7th August 2016
Alucidnation said:
It shouldn't matter what is used behind tiles.
If the job is done properly, water will not get through anyway.
For what it's worth, new build are all normal plasterboard behind the tiles. Certainly in the two bathrooms we have had renovated we found standard PB. In both cases the plasterboard was untouched, after 8 years of being in place.
Sunday 7th August 2016
Andehh said:
Alucidnation said:
It shouldn't matter what is used behind tiles.
If the job is done properly, water will not get through anyway.
For what it's worth, new build are all normal plasterboard behind the tiles. Certainly in the two bathrooms we have had renovated we found standard PB. In both cases the plasterboard was untouched, after 8 years of being in place.
.
That's true.
And over the years has provided me with lots of work rectifying leaking showers. Indeed one local 'Executive' estate we have done over 20 showers, all with std plaster board used, and the tiling/grouting failed due to small amounts of movement.
Edited by Neil - YVM on Sunday 7th August 11:01
227bhp
10,203 posts
100 months
Sunday 7th August 2016
Andehh said:
Alucidnation said:
It shouldn't matter what is used behind tiles.
If the job is done properly, water will not get through anyway.
For what it's worth, new build are all normal plasterboard behind the tiles. Certainly in the two bathrooms we have had renovated we found standard PB. In both cases the plasterboard was untouched, after 8 years of being in place.
In a regularly used shower? I don't think so.
Edited by 227bhp on Sunday 7th August 11:05
Sunday 7th August 2016
Why not?
As I said, if it's done properly and to a good standard then there is no reason not to use it.
227bhp
10,203 posts
100 months
Sunday 7th August 2016
Alucidnation said:
Why not?
As I said, if it's done properly and to a good standard then there is no reason not to use it.
Because (unless in the very unlikely event it's epoxy) grout is porous.
Go to your bathroom now and try it, take a mister spray (maybe even some glass cleaner) or just a wet finger and watch how it soaks in.
Sunday 7th August 2016
227bhp said:
Andehh said:
Alucidnation said:
It shouldn't matter what is used behind tiles.
If the job is done properly, water will not get through anyway.
For what it's worth, new build are all normal plasterboard behind the tiles. Certainly in the two bathrooms we have had renovated we found standard PB. In both cases the plasterboard was untouched, after 8 years of being in place.
In a regularly used shower? I don't think so.
Edited by 227bhp on Sunday 7th August 11:05
Master en suite, so yes used twice a day by us, and I imagine a similar amount for the previous owners. House built in 2006.
Grout is porous, but at several mm thick, on top of a well adhesives tile does limit the damage! You would really need to direct the water at the grout to force enough through.
Sunday 7th August 2016
Andehh said:
For what it's worth, new build are all normal plasterboard behind the tiles.
Because new builds are well known for using only the best of materials in their construction and never cost cutting on the bits that can't be seen 
V8RX7
22,703 posts
235 months
Sunday 7th August 2016
I've used normal PB in my own showers and have lived in the houses for up to 8yrs twice.
Never had a problem.
If people are careless and either:
Don't re seal if there is movement (I've never had to do that either)
Point the shower at the wall whilst they lather themselves up
Don't use an extract fan / window
Then they might have a problem.
Sunday 7th August 2016
227bhp said:
Andehh said:
Alucidnation said:
It shouldn't matter what is used behind tiles.
If the job is done properly, water will not get through anyway.
For what it's worth, new build are all normal plasterboard behind the tiles. Certainly in the two bathrooms we have had renovated we found standard PB. In both cases the plasterboard was untouched, after 8 years of being in place.
In a regularly used shower? I don't think so.
Edited by 227bhp on Sunday 7th August 11:05
Ripped out countless shower/bathrooms without the slightest hint of any moisture making its way to the plasterboard.
We always use aquapanel but I certainly wouldn't have a problem tiling on to a well supported 12.5 board.
Sunday 7th August 2016
jagnet said:
Andehh said:
For what it's worth, new build are all normal plasterboard behind the tiles.
Because new builds are well known for using only the best of materials in their construction and never cost cutting on the bits that can't be seen
Whilst I am in general agreement with you (several areas of ours show sloppy tradesman) any fault for the first 2 years are instant builder-put-right, it isn't in their interest to risk bathroom replacement for the sake of saving £10 a board (pb or aquapanel etc) . They will have done the math and calculated the risk, and deemed normal grout and plasterboard fine.
Whilst I do agree you could force water through the grout, for general showering practise I think you are pretty safe.
(However, all above said and done... For our wetroom we still used moisture resistant PB, tanked the hell out of it (double the manf recommended layers) , and I use grout sealant two/three times a year to be safe! )
Sunday 7th August 2016
Why would you use a poor cproduct, when there are much better ones available ?
Sometimes plasterboard will be fine, but why risk it for a few quid?
The problem is movement, not the porosity of the grout. It only takes a tiny amount of movement, then the grout fails, then moisture gets in, then it's game over.
Tile backing board is far more rigid on its own, so firstly reduces the initial risk of failure, secondly won't turn to mush if it does get wet.
Here a pic of a shower we did last year, new build, cost around £900k, approx 4 years old. We have had to do all three showers in the property.
Edited by Neil - YVM on Sunday 7th August 18:57
Sunday 7th August 2016
Because, they were poorly installed.
However most shower trays are now resin and are much more suitable than the crap plastic.
Sunday 7th August 2016
Neil - YVM said:
Why would you use a poor product, when there are much better ones available ?
Sometimes plasterboard will be fine, but why risk it for a few quid?
The problem is movement, not the porosity of the grout. It only takes a tiny amount of movement, then the grout fails, then moisture gets in, then it's game over.
Tile backing board is far more rigid on its own, so firstly reduces the initial risk of failure, secondly won't turn to mush if it does get wet.
Here a pic of a shower in we did last year, new build, cost around £900k, approx 4 years old. We have had to do all three showers in the property.
Don't get me wrong, I totally agree with spending the extra.
Regarding your picture, that is seriously bad workmanship.
I bet you could have popped those tiles off with your finger nails.
Sunday 7th August 2016
Alucidnation said:
Because, they were poorly installed.
However most shower trays are now resin and are much more suitable than the crap plastic.
Yes poorly installed using a cheap product, Ie plasterboard.
Tray was resin stone, so had no bearing on the failure.
If you really want to believe the best product is plasterboard, then more fool you.
Sunday 7th August 2016
Spudler said:
Neil - YVM said:
Why would you use a poor product, when there are much better ones available ?
Sometimes plasterboard will be fine, but why risk it for a few quid?
The problem is movement, not the porosity of the grout. It only takes a tiny amount of movement, then the grout fails, then moisture gets in, then it's game over.
Tile backing board is far more rigid on its own, so firstly reduces the initial risk of failure, secondly won't turn to mush if it does get wet.
Here a pic of a shower in we did last year, new build, cost around £900k, approx 4 years old. We have had to do all three showers in the property.
Don't get me wrong, I totally agree with spending the extra.
Regarding your picture, that is seriously bad workmanship.
I bet you could have popped those tiles off with your finger nails.
Yep,
all looked fine except fine brown lines in the grout, ie fine cracks.
Water was coming through into the lounge below.
Recognised the issue immediately and did remove a tile with my hands to show the customer how the plaster board had turned to mush, after the grout had failed.
Plasterboard was replaced with Hardibacker and some additional noggins
Edited by Neil - YVM on Sunday 7th August 20:26
Sunday 7th August 2016
I was between tenants in a rental I own. While showing a lovely young girl around she said she would take it if I fitted a shower. I'd had a few other people turn the place down because of no shower so thought why not. I've done a few bathrooms since but this was my first one. First job was to tile from bath to ceiling and fit a shower screen. After peeling back the wood chip wall paper there was just the bare old plasterboard. Not knowing anything about backing board or grout sealants or specialist tile adhesive I just cracked right on. It was only when I was refurbish my own home I got into the whole primer backer board etc etc. For a few years after I expected a call regarding soggy plasterboards and tiles falling on toes, but every time I go I always check the bathroom, the grout is intact and the tiles firm. I reckon it's been around 7 years so far and looks like it will last another.
Don't get me wrong though, I would never tile on bare plasterboard again.
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Water Resistant Board For Bathrooms
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