tiles on existing chipboard floor

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offered a job to in mates house, 11 years old.one bathroom and one ensuite both about 3 metres square,
remove carpet and lay ceramic 300 x 300 tiles.
the subtrate is green chipboard which i wont tile onto.
do i use backaboard or overlay with WBP .not keen to take up existing floor but i will if necessary. i intend to move both toilet and pedestal basin in each room to tile under and that will leave the bath or shower tray in the respective rooms.suppose when i do that it isn,t that much trouble to take up chipboard and replace with WBP, except for shower tray/bath.
so after subtrate sorted ,seal with primer, flexible powdered addy, lay tiles.
would you seal tiles and if so when?, before you lay them?
any advice, thanks in advance
 
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tpt

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IF theres no deflection in the floor then backer board will be fine. Your right not to tile onto green chip - nowt sticks to it.

Make sure you prime as per the backerboard manufacturers intructions and dont just use PVA.

You dont have to seal ceramic tiles.
 
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Personally I won’t tile even over boarded chipbut your call; I would replace the floor with 18-25mm WBP; thickness you need depends on floor joist size/pitch/span. Fix into joists ever 200mm, seal the back & edges with SBR primer before lying & support any cut edges with noggins. Use only quality trade tiling products not cheap DIY, it’s generally crap ; only prime if addy manufacture recommends it; not usual with powder addy.

Read tiling sticky & forum archive posts for more info.
 
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