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Hi James, I'm know expert in paving, but I do lay the odd patio.
On the paving expert wedd site it shows with limestone you should make a bridging bond between lime slabs and mortar using SBR and cement mix that you applie to the bottom of the slab. I have successfully used this method to repair old patio's. It appears to work well. The other methods I have used it to wet the bottom of the slabs on the outside course. Which causes suction.
Hope that helps, Dave
Thanks Dave, this is weird in the fact that I haven't experienced this issues before with this stone. I haven't used the SBR mix before and it's never been an issue.
I did email Tony from Paving Expert and he has suggested that these stones are perhaps clearance one which have been sat in the yard for a while. If they are they quite often get dusty and this causes issues