Discuss Tiles over floating floor substrates in the Advice Forum for Australian Tilers area at TilersForums.com

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PHarry55

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Hi all.
I've read a few forum comments or articles about the dangers of laying tiles over floating floors due to deflection and cracking of grout/tiles. Was just wondering if there was any sort of floating substrate board where a professional tiler would be comfortable laying tiles on?
Hypothetical: A 12 or 18mm thick dimpled acoustic underlay laid over the structural floor slab. Then, two layers of 6mm thick CFC, laid 90degrees to eachother so as to provide superior strength across the joins (less deflection). Would anyone here feel comfortable laying tiles onto that total 12mm thick CFC in that scenario?
If not....a third 6mm layer, again laid 90deg to the one below? 18mm total?
Any comments would be appreciated, thanks.
 

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