Painted wall material

Hello,

for my current projects of individual exhibition stand design and visualization I have to find a adequate wall paint material. For the constuction will be used walls made with wooden chipboard plates and they get painted with common wall paint colors. The thing is that a painted wall don’t have a clean plain surface. From the paint it get a noisy and abit bumpy surface.
Example painted wall:


I tried to find a way to setup the materials with a glossy and diffuse color and a noise texture as displacement:

Setup wallpaint white and green color matt:



The wallpaint material blendfile can be downloaded here.

My question is how to make the bump height of the displacement noise texture controlable and also any other help and comments regarding the material setup is appreciated.

Thanks and regards,
Matthias

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