I've got a large old patio made of random concrete slab shapes. Each year I weed it and fill in some of the cracks but by the next spring (or even end of that summer) the filling has broken or crumbled (I used mortar as previously advised but think I might have used the wrong type!).
I'm fed up with it looking rubbish and was wondering whether it would be possible to overlay it with a pebble mosaic (something like the one here: http://2ff8n03drmib1b12373aauek-wpengin ... tio_15.jpg ). I was thinking to do this with concrete over the top of the slabs as the patio is raised a good two foot above the lawn level, has hardcore underneath and therefore freezing / frosts won't be an issue.
My questions are:
Is it possible to use the existing patio as a Base or do I really need to dig it all up and start again?
What type of concrete would be appropriate? And what depth of concrete would be needed to stop this cracking too?
I've seen a video that recommended mortar to stick things down then grout to fill the gaps. Do you think this would work, and if so what type of grout would you recommend?
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