INSUL-WALL from Green-R-Panel Systems lets builders insert insulated panels between their 2x4s or 2x6s. Slots in each panel hold framing members in place. The panel’s interior-facing side includes 3x3-inch horizontal channels to accommodate electrical and plumbing. The mold -and mildew-resistant panels eliminate the need for exterior sheathing and offer a 2-inch thermal break with R-values of 20, 24, and 28. 855.467.8592.