Species Groups for Plywood
Species Groups 1-5
Sanded Plywood - Georgia-Pacific (table 3)
1 = strongest, 5 = weakest
reference design values not available for Group 5
Panel Grade
grade number is only for face and back plies
crossband and center plies could be from Groups 1-4, and Group 4 is assumed for calculation purposes
STRUCTURAL I
all of the plies are from Group 1
exterior glue is used
further restrictions on layup, knot size, and repairs