IMHO, there is nothing you can put in to prevent weeds, over the seasons (years) dirt will accumulate above the barrier, and you will get weeds. I use a good liquid weed spray and go out and spend 15 to 20 minutes of quality time spraying the weeds. One other thought, if I understand what you are proposing you will accumulate water during heavy rains, and you will not be able to water plants correctly.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
Last edited by villagetinker; 07-22-2021 at 11:37 AM.
Reason: added additional thoughts.
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