Give an example of a structural grade wood species group. Why are species groups used in structural grading?
a) Example: Southern Pine. Species groups are used to account for variations in strength within a species due to growth conditions.
b) Example: Cedar. Species groups are used to simplify grading processes and reduce costs.
c) Example: Redwood. Species groups help ensure uniformity in wood quality.
d) Example: Oak. Species groups are used to determine wood's resistance to fire.