Use Polystyrene Sheet As Drywall Shim

In either sense shims are cut perfectly to size for working with full sheets of drywall.

Use polystyrene sheet as drywall shim.

This foam board insulation is the rigid pink or blue panels that can be found at home centers in many different thicknesses. You may need a skim coat if you are repairing a crack filling a joint or leveling an area with an existing flat surface. The structure will be removable for intermittent access. Use polystyrene sheet as drywall shim.

At 1 1 2 inches wide drywall shims are the width of a stud reducing width waste and the need for long cuts. I usually have lotsa scrap 1 4 stuff around. I have a partial sheet of polystyrene insulation that i plan to cut into a shape to insulate a square hole without permanently filling the hole. Place it horizontally along the wall at various elevations to determine the thickness of the shim i just rip plywood.

Less than that i use construction adhesives which will take out the slop for a 1 16 easy. You may need a skim coat if you are repairing a crack filling a joint or leveling an area with an existing flat surface. Get an 8 level.