This European Standard specifies requirements for visual and machine strength graded structural timber of rectangular cross-section shaped by sawing, planing or other methods and of minimum cross sectional dimensions complying with EN 336. This European Standard includes provisions for test methods, Assessment and Verification of Constancy of Performance and marking of structural strength graded timber. NOTE For machine strength graded timber additional provisions for type testing (TT) are given in EN 14081-2 and for factory production control (FPC) in EN 14081-3. This European Standard identifies characteristics for which limits have to be given in visual grading standards. This European Standard covers structural rectangular timber, untreated or treated against biological attack. This European Standard does not cover: - timber treated by fire retardant products to improve its fire performance; - finger jointed timber.