Mulch & Weed Barrier Combo is a for sure No No in my book. When you put the mulch on top of the weed control fabric, the mulch decomposes & turns into topsoil. The weeds then start growing on top of the weed control fabric, the roots of the weeds find their way through the fabric, get firmly rooted into the soil. Then it can not be easily removed, Making it extremely difficult to remove old mulch before adding new.
There is a right time to use Weed Barrier & that is with rock & really then it is more of a Rock barrier then it is for weeds. The fabric keeps all of your expensive rocks on top of the dirt and keep them from sinking into the mud. Why doesn't weed barrier keep weeds out of rocked landscaping? well your "new" rock comes straight from the landscape supply yard "washed" but still has dust on it, when it rains that dust settles to the bottom of the rock and lays ontop of the fabric. Then decomposing grass clippings, & leaves add to the organic matter, which if the grass is mowed away and the landscape blown out afterwards will help slow this down. Finally there is the dust when the wind blows, not much at a time but it also adds to that layer.
To conclude, there is no magical carpet that keeps weeds out. If you see a landscape bed that is weed free, that is because time or funds were invested to keep the maintenance up on it
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