Joined: July 2004
||Posted: 29 Oct. 2019,12:33
Wrong and even wronger!
Flexible block paving should NEVER be laid over a sand/cement bed. It may be working now for your freind, but the driveway will not perform, or survive as long, as would a properly constrcutred flexible driveway.
And then flexible block paving should not be jointed with a brush-in mortar. It's a nonsense.
The simple rule we have followed for over a hundred years is "flexible on flexible: rigid on rigid."
If the pavement is to be flexible, then there's no binder (cement) in the bedding, and none in the jointing.
When the pavement is to be rigid, the bedding must be bound (a cement-based mortar) and so must the jointing, which should have sufficient strength to support the poaving as a whole.
I still see no need for rigid paving on your project, but I would strongly recommend intermediate restraining courses. However, if you want to use the rigid option, then you must ensure the build-up is correct, so NOT a thin scattering of sand and cement over a flexible sub-base, but a proper rigid base, with a rigid (mortar) laying course and then rigid *strong* jointing.
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