Laying quarry tiles

[hola]

I'm looking to extend the outdoor patio in a new ground floor apartment in Spain. The existing 20cm x 20cm quarry tiles are set in an approx 5cm thick concrete bed laid over compacted soil.

In extending the patio, is a 5cm concrete base really thick enough for everyday use? I'm planning a 1 cement: 3 sand: 6 aggregate mix - would that be OK?

Should the tiles be immediately laid directly onto the concrete as soon as it is levelled or should they be laid in a sand / cement screed once the concrete base is dry? If the latter, is a 1:3 mix for a 5mm screed enough?

Any other tips for this Easter holiday job will be gratefully received!

 

[lancenotalot]

Most concrete patios are about 4" (10cm) thick,your mix sounds ok,use 20mm aggregate.

Let the concrete dry out a bit.
You should then be ok to lay the tiles directly onto the concrete but I would use powdered adhesive rather than a cement screed although at one time that is how all tiles were fixed.

 

[hola]

Thanks for the prompt reply.
I think in Spain these tiles are still laid on cement, so not sure if adhesive is available. If I set them in cement screed would a 1:3 mix say 5mm deep be OK?