We removed the siding, replaced a lot of rotten OSB, added 2" of exterior insulation with the seams sealed with Dow Weathermate and/or Zip System tape, replaced all windows with high performance Strassburger uPVC windows featuring molded in trim with an integral J-channel, and Azek cellular PVC corner trim with an integral J-channel for clean lines. Then we resided with 8" horizontal lap vinyl siding. The finishing touch was a galvalume metal roof for the porch.