Experience with weed control fabric - How should I lay it?

Hello, I want to put a weed barrier fabric around my roses. It is a long hedge. But the weeds grow so strongly underneath, I can't control it. However, I am concerned whether enough water will still reach down. Does anyone have experience with something like this? Can I just put it on the weed now in winter so that it dies underneath?

With a fleece, enough water always passes through: water simply flows through it. I find these things very effective. In the rock garden, we have such fleece. Water drains away without any problems, and no weeds grow through anymore.

How long can it remain like that and does it have to be replaced at some point?

The fleece in the rock garden is on the soil, so soil, fleece, stones on top. That stays forever. But I am not sure if you are talking about the same type of fleece.

There are different types. They differ in thickness and thus permeability. I would try it with an average fabric. A few stones on top, and that's fine.

Do stones have to go on there? I wanted bark mulch....?