The best thing to do for roughness is to either not use a map and set it up as variable roughness, or use a map with variable roughness .

Here are some video demonstrating why you would want to do this. None of the included base nodes in Cycles or Superfly know how to do this by default.

Here is how it is done without a map. https://youtu.be/PwhACBSOsyU?si=7A-GgsDkK0USaPHR And this will work for a lot of things. Most actually.

And here is how to do it with the roughness map no one supplies because you don't really need it. https://youtu.be/DrMdUYk-eLA?si=5HXTppCXLDC1Xg69

There are a few ways of getting around the fact that Superfly still doesn't have the required RGB curve node to do this easily.

None of which are simple and strait forward...............

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Some things are easy to explain, other things are not........ <- Store ->   <-Freebies->