Patio Mortar Bed Thickness Limit

I'm laying a patio. After digging too deep and having already bought and compacted 5 tonnes of hardcore type 1 for the sub-base, I don't know if I can bear to order/haul in another 1-2 tonnes to bring the sub-base up to the desired level. How thick can a mortar bed be with a very strong subbase underneath? I am looking to lay a 60-80mm mortar bed in some places to then lay my 18mm patio slabs on top of. Would 60-80mm be too thick?

1 Answers

68/80mm is thick but as a whole the paving would be structurally sound as the base of the slab spread evenly on the main area would he solid as long as it was done with a full mortar bed each time, it would cost a bit more as 80mm is a lot to build up but it would never move and would be a solid area to walk on or out anything on.
13th Jun 2022
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