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If it's any consolation, all the little flexes I was noticing disappeared as soon as I put the walls in place. Weight FTW!
This paving was genuinely awful, the total range of heights was about 15mm. Shocking. If it was mine I would have ripped it up and laid it fresh.
hamrack-
Cool. I imagine it would be nigh on impossible to have a perfectly level surface in a real world application. The idea being to reduce as much of the flex as possible to remove any undue focussed stress points on the structure. There will be a certain amount of tolerance in this but the more you do to mitigate, the better. As you have done.
stevo_com
I ordered the extra bearers and picked up a roll of damp proof course too. Will find out on Sat just how level the concrete is.