After doing our roof over in metal we decided that the cedar shingles looked kind of crappy with several of them curling so we are going with vinyl siding. Since three of the four walls of the house are only 2 x 4 construction we also are adding foam panels for some additional insulation -- 3/4 inch to be precise. The contractor plans to strip off the shingles, nail up the foam panels and then put on the siding . . . Quick question . . . Should the contractor apply Typar or tar paper between the plywood and foam panels . . . or would putting up the foam panels and taping the seams work instead?