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.

Use polystyrene sheet as drywall shim.

At 45 inches long drywall shims are the perfect length because they are the width of a sheet of drywall or half of an 8 foot length. 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. Due to factors beyond the control of the drywall doctor we cannot guarantee against improper use or unauthorized modifications of this informati. At 1 1 2 inches wide drywall shims are the width of a stud reducing width waste and the need for long cuts.

Get an 8 level. Use polystyrene sheet as drywall shim. The structure will be removable for intermittent access. You may need a skim coat if you are repairing a crack filling a joint or leveling an area with an existing flat surface.

Place it horizontally along the wall at various elevations to determine the thickness of the shim i just rip plywood. I usually have lotsa scrap 1 4 stuff around. Less than that i use construction adhesives which will take out the slop for a 1 16 easy.