Traditional wall framing uses more studs than necessary to structurally support a wall. Using more studs not only increases the amount of lumber used, it decreases the amount of available space for insulation, and increases the surface area of lumber. Framing materials are not good insulators; heat can move through them from one side of the wall to the other. To reduce the amount of lumber in the walls while allowing more room for insulation, high-efficiency advanced framing uses techniques like thicker studs spaced further apart, two studs rather than three or four studs in the corners, aligning windows and doors on a two-foot grid, providing space for attic insulation above exterior walls, and other techniques that can help homeowners save energy and money.