How to Insulate Existing Walls without Removing Drywall

Open-Cell Injection Foam Insulation Kit – 35 cu.ft. Slow Rise Retrofill | Green Wall Cavity Foam for Closed Spaces | R-4.4 per Inch | Includes Gun, Hose, Nozzles & Injection Tube

Owens Corning FOAMULAR 250 2 in. x 48 in. x 8 ft. R-10 Scored Squared Edge Foam Board Insulation Sheathing 52DD

Scott on Instagram: "Product links is on our Facebook Page. In this video, I walk through how to install rigid 2" foam board insulation across a shed ceiling using standard 4x8 sheets. My shed requires six panels total, with two sheets spanning the width, so the process starts with trimming the boards and scoring them cleanly using an OLFA knife. A long blade makes cutting easier, but you can also score-and-break as long as the cut rests on a solid surface. From there, I lift each panel into pla