These are a 1.2m support span board and are an upgraded version of the Grade A Boards. They are machine stress graded to clearly defined new grading rules. Recent research (by TimberSolve, HSE 02-1) has given extra credence to this board with established loadings and grade rules. The new grading rules provide a sound platform for a 1.2m support span and this type of board is widely used throughout the industry.