How to rough in window and door openings with 2×4 framing and 3″ of continuous board insulation outside sheathing?

Hi there – I’m retrofitting an addition with 2×4 framing. The layers from inside to outside are as follows: 2×4 framing, zip sheathing, 3″ polyiso (in two 1.5″ layers), furring strips,… Hi there – I’m retrofitting an addition with 2×4 framing. The layers from inside to outside are as follows: 2×4 framing, zip sheathing, 3″ polyiso (in two 1.5″ layers), furring strips,…Read MoreGreenBuildingAdvisor