Most Solid Sawn Grading is based on visual inspection. Lumber strength varies from regions and species of Southern Yellow Pine within the United States. The only way to be sure of the strength of planking is to proof load at the time of manufacturing.
If the original plank was marked with a credible stamp and the customer can provide a certificate of grade, yes the plank is still considered scaffold grade. But the new loading values must be reviewed by a competent person.
The regulation states that the surface of the plank cannot be covered with anything so as not to be able to see knots, grain, and imperfections in the wood. They have no problems with our translucent non-skid coating, giving much longer plank life translating into money saved.
Rodding a plank is a process where a hole is drilled and a metal rod is inserted to prevent cupping and splitting. Rebar does nothing to prevent splitting. Twist lock pins actually screw lock into an under size hole locking the wood together preventing cracks from starting and spreading.
ANSI A10.8-2001 states “all solid sawn wood planks shall be rated as ‘scaffold plank’ and shall be certified by, or bear the grade stamp of, a grading agency approved by the American Lumber Standards Committee.”
OSHA does not inspect lumber therefore any stamp that says “OSHA APPROVED” is at best misleading, and should not be assumed to meet the criteria on that basis alone. Ask your supplier for a certificate of grade to ensure compliance.