So I built an out building and I finished the electrical and I'll be starting the insulation and wall covering soon. I have a problem/question that has popped up. I used standard stud mounted metal boxes for the everything. They are screwed to the studs and have small tabs that more or less set the position of the box on the stud in relation to the depth. Well the material I plan to put on the wall is 3/4" thick and the boxes are basically made for 1/2" material so my boxes will be roughly 1/4" short of flush to the finished surface. I can shim out the duplexes and switches with spacers I suppose but I was wondering if there is a better solution available. Has anyone had experience with this sort of an issue? Is there something better on the market to make up that gap?