How far should 2x4 be apart?

Wood-framed houses have traditionally been built with 2x4 studs spaced 16-inches on-center.

basc.pnnl.gov - Advanced Framing: Minimum Wall Studs

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Description

Adding more studs than necessary wastes lumber and reduces the wall’s thermal resistance because the lumber blocks cavity space that could be filled with insulation and because each stud represents a thermal bridge that can transfer heat between the interior and exterior of the building. Wood-framed houses have traditionally been built with 2x4 studs spaced 16-inches on-center. Research has shown exterior framed walls can be adequately supported by 2x6 studs spaced 24-inches on-center. This wider spacing reduces the number of studs in the wall, thus reducing thermal resistance and increase the amount of space available for insulation. Building walls of 2x6s 24-inch on-center has long been permitted in building codes in most jurisdictions, and is particularly appropriate for colder climates (IECC Climate Zones 5-8) where higher wall R-values are required (Baczek, Yost, and Finegan 2002; DOE 2002; Lstiburek 2010). In some jurisdictions, particularly in hurricane zones, 16-inch on-center is the maximum stud spacing allowed; check with local code officials. This 2x6, 24-inch on-center stud spacing is one of many components of advanced wall framing that reduce costs and provide materials and energy savings. Techniques for installing 24-inch on-center exterior and interior wall framing and single top plates are described below. Other techniques are described in other resource guides: see Insulated Corners, which explains how to construct corners with 2 studs instead of 3 studs to permit more insulation, Insulated Headers for tips on how and when to build open and insulated headers over windows and doors, Minimal Framing at Doors/Windows for efficient framing around doors and windows, and Insulated Interior/Exterior Wall Intersections for ways to reduce framing and add insulation where interior walls intersect exterior walls. In one study employing several advanced framing techniques, such as 2x6 24-inch on-center wall framing, 24-inch on-center floor joist and rafter spacing, 2x4 24-inch on-center interior framing, 2-stud corners, open and insulated headers, reduced studs around windows and doors, and single top plates, all of the measures combined contributed to energy savings of 13% over standard framing but this single measure alone - switching from 2x4 16-inch on-center to 2x6 24-inch on-center framing– accounted for energy savings of 11% (Lstiburek and Grin 2010). The energy savings is accounted for by two factors – the thicker wall enables wall insulation to be upgraded from R-13 to R-19 and less studs mean less thermal bridging. Building scientists suggest that builders should consider the “whole-wall” R-value as opposed to the center-of-cavity or rated R-value of the insulation. In one study, a 2x4 16-inch on-center wall was insulated with batts labeled R-13, but researchers calculated the actual whole-wall insulation value of the wall at R-9.4 (or 72% of R-13) when the thermal conductivity of the framing, windows, and doors are taken into account. In the same simulation, researchers found that the calculated whole-wall R value of a 2x6 24-inch on-center wall insulated with R-19 batts, was R-15.2, or 80% of R-19 (Baczek, Yost, and Finegan 2002). While both walls had a lower whole-wall R-value than rated R-value, the 2x6, 24-inch on-center wall with R-19 performed closer to its rated R-value because the wall had less thermal bridging.

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Stud spacing can also affect cost savings. In one study of a 2,910-square foot home, switching from 2x4 16-inch on-center framing to 2x6 24-inch on-center framing reduced board feet of lumber by 1,634 feet and cut costs by $171. When other advanced framing measures were added, like switching to single top plates, 24-inch spacing of interior walls, and open headers, lumber costs were reduced $1,117 (Baczek, Yost, and Finegan 2002). Framing on a two-foot also saves money by reducing material waste. Most sheet goods (plywood, OSB, foam insulation) come in 4x8-foot sheets. When the entire home is designed on a 2-foot grid from roof rafters to wall framing to floor joists, sheet good and lumber waste are greatly reduced. Reducing the number of studs in the walls by one-third also reduces labor costs in terms of the time it takes to handle, cut, install, drill through, and attach to studs. Based on numerous field experiments, Building Science Corporation estimates savings of up to $1,000 per home in materials and labor are possible for production builders who use a combination of advanced framing techniques (Lstiburek and Grin 2010). Advanced framing techniques should be specified in the framer’s contract. Detailed framing elevations should be prepared after confirming that these advanced framing techniques are permitted by code in the local jurisdiction. There is a cost associated with redrawing existing floor plans or providing framing details for new plans, but the cost per home is minimal if the plan will be used several times. Also, cost savings will be realized because the details will help gain building official approval, improve accuracy for materials purchasing, clarify instructions for the lead framer, assist in training subs, and greatly improve the chances that the specified measure will actually be implemented (Baczek, Yost, and Finegan 2002).

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Figure 1. Traditional framing of stud-framed walls with 2x4 studs spaced 16-inches on-center uses more wood than necessary and limits the amount of insulation that can be installed. Advanced framing uses as 2x6 24-inch on-center wall framing, single top plates, and no more studs than are structurally needed, providing a dimensionally thicker wall with more space for insulation (Source: Courtesy of PNNL). Figure 2. This house is being built with advanced framing techniques including 2x6 24-inch on-center wall framing, single top plates, open headers over windows on non-load-bearing walls, and minimal studs around windows (Source: Building Science Corporation 2010).

How to Construct Walls with Fewer Studs

basc.pnnl.gov - Advanced Framing: Minimum Wall Studs

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