DIY Heavy tiles onto skimmed moisture board

Discuss Heavy tiles onto skimmed moisture board in the DIY Tiling | Learn to Tile area at


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I'm looking for some reassurance that I can get away with tiling onto the skimmed moisture resistant plasterboard that is around my new bath.

I wasn't planning on using heavy tiles when I prepared the bath surround and didn't feel the need to fully waterproof it as there is no shower spray so just had the plasterboard skimmed and then primed it ready for tiling.
Now I have 12mm thick marble veneered ceramic tiles and an worried that I am running a risk that they may be too much for the substrate.
The tiles are 600x300 and I only intend to fix 2 rows above the bath. The weight per m2 obviously exceeds the max for skimmed plasterboard but over a relatively small area do I need to be overly concerned?

My solution if the plaster wont hold will be to cut out a 800mm wide band of the plaster board and fit hardiebacker to fix the tiles to. with the mess and faff of adding extra noggins etc. I really could do without it.

Any advice greatly received!


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The Tilers Forums answer would be to do it properly by taking the board off and replacing with a TBB

In reality, it’s two tiles up from the bath, it’s plaster that was skimmed directly onto board so you should know how good the bond is so in reality it would be fine.

However, we are professionals here so we wouldn’t be able to do such a thing for a paying customer.


Unregistered (Please Register)
Hang on, it’s MR board?!

I take back my statement. MR board shouldn’t be skimmed full stop.
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