Discuss Substrate prep for uneven chimney breast with heat in the DIY Tiling Forum area at TilersForums.com.

S

SandsofEss

We’re planning to have our chimney breast tiled in split face slate or quarzite stone.

We’re getting a pro in to fit the tiles, but to keep to a tight budget I need to prep the substrate myself. Whatever I do needs to stand up to the heat from a freestanding stove.

I’ve stripped the chimney breast back to bare brick. It’s solid, but there are chunks of mortar missing, and it’s not particularly level.

My plan had been to mechanically fix 12mm hardiebacker boards to the chimney breast, but I’m now wondering if that will prove difficult if the wall is out a fair bit.

As far as I can tell, my options are:
  • Mech fix the hardiebacker anyway, trusting that the rustic look of the split face tiles will deal with the unlevel wall (I presume this is a no-no)
  • Dot and dab the hardiebacker boards with a heat resistant adhesive to get them level, then screw them to the brickwork for long term stability (this will leave some voids behind in some places – maybe a problem given the heat?)
  • Render the chimney breast until it’s level, then tile directly onto this
Are there any options I’m missing?

If you’ve fitted natural stone tiles near a stove before, how have you done it?

Any advice would be gratefully received.
 

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Substrate prep for uneven chimney breast with heat
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