Shower waste pipe and concrete floor

a 70's built house should still have a damp proof membrain of some sort, doubt it would be plastic, more likely synthaproof/blackjack, which was painted on before the screed was laid. your screed will be somewhere in the region of 50mm approx.
 
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Hi

thanks for the heads up on the laminate.. one final question i think.. do i still need the 18mm ply if i has a concrete floor that has been leveled??

can i just put the sand and cement mix straight onto the concrete floor, then the shower tray on top??

With having a concrete floor base.. i don't really understand what the 18mm ply adds to the whole thing.. Can you explain?

thanks again

Stu
 

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