![]() This means a board on a 7' span can deflect up to 1.4" when fully loaded. The mandatory rule is found in OSHA 1926.451(f)(16) and says a scaffold board cannot deflect more than 1/60th of its length when loaded. Appendix A is a guideline and not mandatory. Deflection Tolerances for Scaffold Boards Per OSHAĭo the Appendix A guidelines create a problem for medium-duty contractors (basically all masonry contractors) using 7' spans? Not necessarily. Here is another link to an OSHA workbook with this information. The maximum allowable span between the frames with this type of board is 6’. _|_|_Īccording to the Appendix, using the typical 7’ span between the frames with the 2X10 nominal thickness lumber will not achieve the 50 pounds/square foot rating in terms of board capacity. This appendix contains the following chart: _ OSHA has provided a non-mandatory Appendix A to help contractors comply with the requirements of Subpart L. Scaffolding and scaffold board load requirements are governed by OSHA 1926 Subpart L. OSHA Load Requirements for Scaffold Boards Using full thickness (solid sawn) lumber, this weight is not a problem, however, full thickness lumber is hard to find so most companies use nominal thickness lumber. If you apply an intended load of 50 pounds per square foot to the 35 square foot platform, a maximum of 1,750 pounds may be applied to the platform. ![]() In this setup, there is approximately 35 sq. In most masonry applications, 5' wide frames are spaced 7' apart and use nominal thickness 2X10 lumber for the planks (nominal thickness 2X10 lumber actually measures 1.5” X 9.25'). Most of our customers fall in the medium-duty category so this is what will be addressed in this post. These ratings are based on the intended load, which is calculated by dividing the total weight to be placed between two spans of scaffolding by the total area between the two spans. OHSA designates three different categories for load bearing calculations on scaffold boards. Load Limits on Scaffold Boards in Medium Duty Applications
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