Discuss Laying porcelain over concrete paving slabs in the DIY Tiling Forum | How to tile area at TilersForums.com

S

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Hi there,

I'm about to undertake a job involving laying 60cm x 60cm porcelain slabs in my garden. The area I wanted to cover currently has old concrete paving slabs that are still solid, but have seen better days and aren't perfectly level. My question is can I lay the porcelain tiles on a mortar bed (6 to 1 mix?) with a slurry primer directly over the concrete kavjbg slabs, or do I need to rip them up and lay a sub base, so start all over again? Or even lay a sub base over the pavers, then lay concrete slab and use adhesive? For ref, I have lots of cement and building sand left over from a previous job, but want to do this properly, hence the question.

I'm a new tiler, but pretty efficient DIYer in other fields, and familiar with working with mortar and cements of various mixes, so pretty confident I can do a decent job once I'm over this issue. Any advice greatly appreciated!
 
S

Simstone

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Morning, i would be definitely starting afresh , a disaster waiting to happen if you did.
Good luck. 👍
Thanks! Just out of curiosity, would the same advice go for any other type of tile (thinking sandstone or other natural stone).
 
Dave

Dave

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Thanks! Just out of curiosity, would the same advice go for any other type of tile (thinking sandstone or other natural stone).
Imho yes. 👍 ... previous paving/tiling is subject to expansion and will expand and contract at a different rate to an overlay. Thus the possibility of a failure
 
F

F layer

Morning, i would be definitely starting afresh , a disaster waiting to happen if you did.
Good luck. 👍
Why if your substrate is solid with no movement what are your concerns? Please explain why you have come to this conclusion
 
bsc ceramics

bsc ceramics

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as explaned in earlier posts it may seem solid but concrete paving slabs are not
a good base to tile onto...
 

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