I have several friends told me that before
placing the pavers on the setting bed sand,
I should request the constructor to pour
a layer of cement underneath for stability
and prevent weeding.

I have checked that out and one constructor
told me that unless a think layer is poured,
the effect will not be beneficial. However
the cost will be huge. I also checked that
the drainage becomes crucial too.

Would you please comment on that? Thanks.