Traditional wall framing uses more lumber than is necessary and limits a builder’s ability to insulate walls. Wood and other framing materials are not good insulators. Heat can move through them from one side of the wall to the other. High-efficiency advanced framing uses techniques like thicker studs spaced further apart, two studs rather than three or more studs in corners, aligning windows and doors on a two-foot grid, and other steps to reduce the amount of lumber in the walls, while allowing more room for insulation.