DIY Doctor UK DIY Forums

i have been watching the tilers next door install a screed on a roof terrace they lay a sand and cement screed on a dry concrete base to get their level,and then tile directly onto it 2 hours later.Now its hard enough to stand on,But surely it should be left to dry.
Has anyone done this method as I have never seen it done and are there any complications afterwards.

hi welsh brickie,

never seen it done this way before but i guess it would be no different to laying slabs or bricks into wet concrete. why use another layer of adhesive, provided the tiles bond with the cement in the screed i suppose it makes sense especially as it's exterior.

wall tiles used to be set with a cement mix before tile adhesives came onto the market.

don't know why they left it for two hours though - i'd have thought that this technique would work better if the tiles were laid directly onto fresh screed.

thanks chris for your reply,It seems to have set well enough I was just curious to see if the tiles would pop as time goes by

The wait for it to become walkable seems strange. you can lay some tiles into wet cement but its very unusual these days.