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Building up an area prior to tiling.

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I am tiling with 600 x 300mm tiles mostly over existing tiles. I have primed ith Mapei Eco Ultra Grip. The lower section of wall where the bath was is not tiled. I have installed 10mm backerboard there but it is around 4mm less proud than where tiled. How can I fill this area in to bring it to the same level as the pre tiled upper wall, before tiling over with new tiles. See photo.
 

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Good morning Dav657.
There are a couple of ways of doing this….
If you put a long straight edge ( eg an 1800 spirit level) down the wall across your tiles and the ‘void’ and you’re relatively confident that the gap is the same everywhere, then you could “ plaster it” with the back of your tiling trowel with RapidSet tile adhesive. Keep running your WET straight edge over it to keep it flat.
The tiles will bond to it no problem when it’s dry.
Another way to do it is to screw a batten to the wall along the bottom row of tiles, and tile the top first. Then when you’re tiling the bottom half, use your notched trowel to first trowel the wall, and as you’re using 600 x 300 tiles you can trowel the back of them AT 90 DEGREES to the wall troweling orientation, and place them on. Obvs keeping your straight edge to hand !
 
Thank you that's a great help, I was thinking along thise lines but needed confirmation it was the right way to go.
 

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