How to fit backer boards to walls

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Tile Warehouse

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Things have changed a bit since you posted this video but it's not just recommended to use backer board for wet areas such as showers but it's actually required by BBS along with tanking of the area ( or waterproofing ).
A few things in the video are a bit off the mark. Cement board is not hydrophobic and it will absorb moisture if it's exposed to it. The difference is that it will not degrade to the same extent as gypsum based products and generally, it will take a rather long time for a leaky grout line to cause an issue. However, you must tank the surface if you want longevity and compliance with BBS. It's also not a hard thing to do now that you readily have liquid applied waterproofers and you are looking at a minor increase in cost. Even replacing a portion of the tiling because of a failure would cost you more than tanking the entire room and not just zones 0 & 1.

edit: sorry for the corrections ... your wall is filled with insulation but the vapour barrier is missing. That's a mistake and you should have a vapour barrier on the warm side of the wall, i.e. the bathroom. I'm well aware that 90% of builds are not like this but we are not talking about barely passing standards here, are we :)

george

Can I use cement board on the wall behind my kitchen taps . Great video

dilligaf

Can I fit backer board to an existing plastered block wall, prior to fitting wall boards for a wet room? How best to fix the tile backer to the plaster?

grahamsmith

I am keen to use this type of backer board for its ability to carry loads like grab rails but I'm concerned that cutting the large diameter (150mm) holes for the concealed shower valve etc is going to be tricky without creating a lot of dust etc. Can you please advise? Thanks.

ColinMill