tiling on chipboard

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Hi, I have just had a loft conversion and they have laid 22mm moisture resistant chipboard throughout.
I am having a go at doing the walls in a couple of days and would also like to try the floor with porcelain tiles after.
In the tile shop they recommended ditra matting, as it wouldn't leave a massive step, but after having a bit of a read on here it seems that isn't what I need.
What would be the best way to tackle this? I don't really want to lift the floor as they have already bedded in the shower tray, could I get away with just a backer board?

Thanks for any help.
 
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Do not tile directly onto chipboard. The tiles will come up. I appreciate you don't what the extra height but that is going to be unavoidable. I use BackerBoard 250 on all my tiling jobs. Use plenty of screws and stagger boards. Also make sure the Backerboards overlap the joints of the chipboard flooring and I put in extra screws through the backerboards either side of the joint in the chipboards joints (if that makes sense) Also, screw the chipboard onto the joists below to tighten it all up. You don't want any squeaks in the future! Use a single part flexi sticky, tiles will stay there for ever.
 
Thanks! Glad it doesn't have to all come up. Might be better to get a pro, will see after i've had a go at the walls.
 
Why don't you want to use a de-coupling membrane such as Ditra ?
 
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Hi, I vaguely remember reading that it wasn't to be used over chipboard as it wasn't as good with any flexing left.
If its the stuff to use I would prefer 3mm to 6.
 
then that's down to the fixing of the chipboard. caber type flooring should be glued to the floor joists and screwed every 150mm along the joists and all joints should be staggered, glued and set on the joists. If you don't fix the first flooring layer properly what's the point of fixing further material over the top.
 

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