I am trying to apply a 2nd layer over the original plaster wall in order to sound proof a room. I was going to use 5/8" Quiet Rock. My concern is how to remove the window trim. Also, if I put a 2nd layer of Quiet Rock over the original plaster will I have to do anything different with the trim to make sure it still fits around the window? Will the added layer create too much distance between window & trim?
You are correct in thinking that you will have to make an adjustment to accommodate the new wall thickness.