Here is a technique called "Advanced Framing" that can be used in Earth Advantage Certified Homes or homes using Blown In Insulation

Advanced Framing

• Advanced framing techniques use less lumber and create walls that can be more effectively insulated, making them ideally suited for areas of the country with tough winters. The walls can be framed with 2 x 4 boards that are spaced 24 inches apart. When the walls support more than one floor, you can frame the walls with 2 x 6 boards and space them 24 inches apart as well.