Design Values of Mechanical Properties
Design values for the different types of stresses are dependent on the type of lumber. The design values given in these tables are to be adjusted to fit the conditions under which the structure will be used. Tables 3.3 through 3.6 give the design values along with its adjustment factors that are specified by NDS for dimension lumber, southern pine dimension lumber, timber (5 x 5 in. and larger) and decking. Table 3.3a through 3.3d gives the design values along with its adjustment factors for all species except Southern Pine. Design values for Southern Pine are shown in Tables 3.4a through 3.4d and Table 3.5.