Heavy tiles onto skimmed moisture board

[Olly]

Thanks for the contributions.

I appreciate that I should have set out differently before boarding the room but I didn't know what tiles or layout I was going for until after the bath was in.

The Moisture board was primed with pregrit before skimming to get a good bond.
I might try a test patch by sticking on an offcut and see what fails when I lever it back off the wall once set. If it's hard work and the paper/plaster bond doesn't fail I'll get tiling.

 

[Waluigi]

You would probably be ok then. I’d be a bit worried if multi/board finish was slapped on with no primer

 

[Cranbrook]

There are some exceptions.

Can you skim an MR grade board? - https://www.british-gypsum.com/technical-advice/faqs/082-can-you-skim-an-mr-grade-board

Ive argued with a number of different plasterers until I was blue in the face about this topic, none of them will ever listen!

 

[widler]

You can skim without doubt skim onto moisture board, but it needs blue grit 1st, moisture board has a coating on it which just skim won’t adhere too .
As for holding the weight , probably, try one, stick it on, leave a day or two and try and rive it off

 

[Boggs]

A few newer build properties I have worked on lately have had skimmed moisture restistant board in bathrooms and had been tiled over.

Taking the tiles off left the fully intact board almost as good as new.

Paint scraper behind skim that was left took it straight off.

 

[Cranbrook]

A few newer build properties I have worked on lately have had skimmed moisture restistant board in bathrooms and had been tiled over.

Taking the tiles off left the fully intact board almost as good as new.

Paint scraper behind skim that was left took it straight off.

Was this for a large housebuilder?

 

[Boggs]

Of course.

 

[Cranbrook]

Of course.

Crazy aint it... 'Reputable' housebuilders that make such embarrassing errors. Should know better!