The NLGA Standard Grading Rules for Canadian Lumber incorporates the National Grading Rules for Dimension Lumber, a uniform set of grade descriptions and other requirements for softwood dimension lumber that form a required part of all softwood lumber grading rules in the United States. Thus, all dimension lumber throughout Canada and the United States is graded to uniform requirements. For engineering design in Canada, CSA O86 Engineering Design in Wood recognizes certain US species combinations as being equivalent to Canadian species combinations for the purposes of determining design values. As per Clause 6.2.1.3 and Table 6.2.1.3 of the CSA O86-14, US Douglas Fir-Larch is considered equivalent to Canadian Douglas Fir – Larch and US Hem-Fir is considered equivalent to Canadian Hem-Fir.