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Tyvek would not let water drain through it for one thing. That's the main reason weed barriers are used. They are supposed to stop weeds but still let water through. Otherwise you might as well use poly.
 

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Why not WRBs? Because one side of Tyvek blocks water. The other side only allows moisture through. So laying it down regardless which side is up your pavers will be floating in a pool.

Why sand and gravel? Because you need a supporting base, and one that drains, under the pavers or each one will be a teeter totter.

If you are spending big money on Unilock, then look at their installation details.
 
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