Preparing for tile backer board in bathroom

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27 May 2012
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London
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United Kingdom
Hi,

I'm planning to tile my bathroom in 40cm travertine tiles with Kerdi backer board. However, the walls aren't ready to be boarded just yet for a few reasons... First, I've reduced the size of a boxed in section so there are now some bits of bare brick next to rendered walls:

(second picture shows the wood from the old boxing that I'll be pulling off the wall.)

The Kerdi people suggested I can dot and dab onto the render and onto the brick, and I should put fixings into the brick on top of that, so that's my plan. Is it OK just to have thicker dabs to compensate for the missing render? Or can I try to compensate with thicker Kerdi if the difference is more extreme?

Number two: while removing a bit of old partition wall a big chunk of render cracked and fell off on a convex corner near a window:



I'm not sure how to board over this? It seems a waste to get it rendered up just to get covered. I'm hesitant to knock all the render off that wall in case that just makes things worse.

Number three: there's a bit of wall that's not properly rendered below about 1.2m from the floor; it's adjacent to a doorframe that's been blocked up (with plasterboard in a wooden frame). The wall is actually sloped, the gap is about 4cm at the top and below 1cm near the floor:



How can I make it all flat enough to get a good, flat backer board to tile onto?
 
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