Joined: July 2004
||Posted: 30 May 2019,10:41
Have I got this right: you plan to lay new porcelain paving over the top of spot-bedded sandstone flags?
That is a bad idea. A very bad idea. Very, very bad. It is almost certainly doomed to failure.
The old paving MUST be removed, along with the comedy bedding. The sub-base should be regulated to ensure you will have a consistent bed depth for the new paving, and then lay the porcelain in accordance ith the manufacturer's installation instruction.
Personally, I would not lay porcelain on anything other than a concrete base with outdoor grade tile adhesive, but I know some manufacturers are pushing the 'lay on mortar' method.
Read more: Laying Porcelain
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