This is because wider spaced stud walls have fewer studs overall. 24″ on center) will have better insulating properties than a stud wall with narrower spacing (i.e. The insulation value of the wood studs is also taken into account in this calculator. These R-values account for the microscopic layers of “air insulation” that form on the interior and exterior finishes of walls. Wall R-Value Tips Air FilmĪn R-value of 0.21 for an exterior air film and 0.68 for an interior air film is added in to the calculation. Hit “calculate” to see the effective R-value of your wall. This is typically drywall or wood paneling. Many homes still use fiberglass batts or blown in insulation between studs.įinally, choose your interior cladding or wall covering. The stud cavity insulation is the most important insulation component of any wall. Typically, a continuous layer of plywood sheathing is used to prevent racking and to add rigidity to stud-framed structures. Many modern homes have a continuous layer of rigid insulation wrapping the home to help minimize thermal bridging through studs.Ĭhoose your wall sheathing next. Next, choose your exterior insulation, if applicable. Note there is also an option for metal/vinyl siding that comes backed with a layer of insulation. Typical siding choices for many homes built today are vinyl or wood siding. Most commonly this is either 2×4 (3.5″ width) or 2×6 (5.5″ width).Įxterior cladding is a fancy term for siding. If your wall is built with advanced framing techniques, choose either the 16″ or 24″ advanced framing option. Check out the framing calculator if you need to calculate materials for wood stud framed walls. Typically, this is either 16″ or 24″ on center. First, enter the stud spacing for your wall.

Wood lathe and plaster wall r value