How to use roughness map?

When i try to use my roughness map in Unreal 4.9 i get a bad result: the material look super-glossy and I don’t understand why.

Can someone help me?

You need values between 0 to 1 for roughness and metallic, so you only need one of the channels(red pin) of your textures. Plug that into the alpha of a Lerp node and then set the min. and max. roughness values you want your material to have as A and B.

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