![]() (See Figure 2.) This air barrier can consist of drywall, OSB, plywood, or rigid foam. Install an air barrier over the studs on the section of wall that will be double framed.Sheathe with the same sheathing as is used on the rest of the exterior walls. Frame the exterior wall using the same stud framing as the rest of the exterior wall, preferably 2圆, 24-inch on-center.How to Air Seal and Insulate a Double Wall Using Batt Insulation The mudded, taped, and caulked drywall and the taped rigid foam exterior sheathing serve as the interior and exterior air barriers. The interior drywall and exterior sheathing serve as the interior and exterior air barriers.įigure 1. Blown-in insulation fills the double-stud cavity. Caulk the drywall to the framing at the top plate, bottom plate, and studs. Drywall when the rest of the walls are drywalled.Ensure that the wall is completely filled to the proper density to minimize settling. Tack netting to the interior face of the interior wall studs and blow in loose fiberglass or cellulose insulation when the rest of the walls are insulated.Install a second section of framing to the inside of the exterior wall framing, where the thicker wall is desired, using 2x4 or 2圆, 24-inch on-center framing.Sheathe with the same exterior sheathing as is used on the rest of the exterior walls. How to Air Seal and Insulate a Double Wall Using Blown-In Insulation This task should be included in the contract for the appropriate trade, depending on the workflow at the specific job site. The insulation and fully aligned air barrier for an accent double wall may be installed by insulators, framers, or drywallers. These three ways are described in the steps below. ![]() Insulate the exterior cavity with spray foam.Separate the interior cavity from the exterior cavity and fill the interior cavity.Fill the entire cavity with blown insulation.There are three ways to insulate a double wall and achieve a fully aligned air barrier: So, the wall must be insulated to at least the level of the home’s other exterior walls, and the insulation in the wall must be aligned with and enclosed by air barriers on all six sides. The important thing to keep in mind about a double wall used as an architectural feature is that if it is located on the exterior wall of a home, it is part of the home’s thermal envelope. That technique is described in Double Wall Framing. This is not the same as the double-wall construction technique used to provide deeper wall cavities for more insulation on all of the exterior walls of a home. The double walls described here are half or full walls included in a home design as an architectural feature that provides a more dimensional appearance. See the Compliance Tab for related codes and standards requirements, and criteria to meet national programs such as DOE’s Zero Energy Ready Home program, ENERGY STAR Single-Family New Homes, and Indoor airPLUS. The spray foam can serve as the air barrier if it is at least 5.5 inches thick if open-cell or at least 1.5 inches thick if closed-cell spray foam insulation. Use spray foam insulation for the wall cavity.Dense-pack the entire cavity of the double wall assembly with blown insulation, ensuring the insulation is in contact with the insulation to the top of the wall cavity with no misalignments, compressions, gaps, or voids in the insulation.Install insulation in the interior wall cavity equal in R-value to other exterior wall cavity in the home, without misalignments, compressions, gaps, or voids.Seal all seams, gaps, and holes of the air barrier with caulk or foam.Install a continuous air barrier on the exterior of the interior wall.Air seal and insulate double-walls that are half-height or full-height walls used as architectural features in homes.
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