2×6 Exterior Walls for Superior Modular Construction | Strength and Efficiency

Leland's Modular explains why it builds exterior walls with 2×6 framing instead of the 2×4 lumber common in most site-built homes. The extra depth of the wall cavity allows for significantly more insulation, pushing R-values into the R-19 to R-21 range compared to roughly R-13 to R-15 for standard 2×4 walls, which the company says exceeds current code minimums and improves temperature control and energy costs.

Beyond insulation, the thicker walls add structural benefits — greater load-bearing strength, better resistance to lateral forces, sturdier connections between multi-section homes, and more room to route electrical, plumbing, and HVAC lines. The article frames the modest upfront cost as a long-term value driver: lower utility bills, reduced HVAC strain, and stronger resale value.