![]() Employers shall ensure the proper selection, inspection and maintenance of wood scaffold planks.Īn important safety aspect that is often neglected on a formal basis is the inspection of scaffold planks. It is therefore important that every employer ensures wood used in a work platform is of minimum risk to health and safety when used as directed. A weight loss of 2-3% due to incipient decay can reduce the impact resistance on planks by as much as 50%. Incipient decay in scaffold planking is a concern because it is hard to detect and has a dramatic effect on the impact resistance of the plank. ![]() 2 grade lumber is more susceptible to water infiltration and incipient decay. 2 grade and better S-P-F lumber can be considered as equivalent to No. This species combination is stamped with the common designation S-P-F (spruce, pine, fir). Also, given that a number of Canadian timber species are grown, harvested, manufactured and marketed together, typical species combination for spruce and fir also includes pine. The differences between grades relate primarily to the appearance of the material. These changes followed a countrywide testing program that showed no significant differences in strength characteristics between No. However, due to changes in grading rules, lumber is now typically graded as No. 1 grade planking specified in Regulation 91-191 was commercially available in New Brunswick. 1 grade or better spruce or fir scaffold planks are difficult to obtain. All wood bearers shall be reinforced with 3⁄16 x 2 inch steel strip, or the equivalent, secured to the lower edges for the entire length of the bearer.Legislative Interpretations Topic: Scaffold Planksġ28 An employer shall ensure that all wood used in a work platform is NOTE: All members except planking are used on edge. Maximum vertical spacing of horizontal members Note: Platform units used to make scaffold platforms intended for light-duty use shall be capable of supporting at least 25 pounds per square foot applied uniformly over the entire unit-span area, or a 250-pound point load placed on the unit at the center of the span, whichever load produces the greater shear force. 250 pounds placed at the center of the span and 250 pounds placed 18 inches to the left and right of the center of the span (total 750 pounds).250 pounds placed 18 inches to the left and right of the center of the span (total 500 pounds).250 pounds placed at the center of the span (total 250 pounds).75 pounds per square foot applied uniformly over the entire span area.50 pounds per square foot applied uniformly over the entire span area.25 pounds per square foot applied uniformly over the entire span area.Masons' multi-point adjustable suspension scaffolds.įabricated planks: Maximum intended load being calculated Rated load.Stonesetters' multi-point adjustable suspension scaffolds.Two-point adjustable suspension scaffolds.Single-point adjustable suspension scaffolds.Step, platform and trestle ladder scaffolds.Form scaffolds and carpenters' bracket scaffolds.Plasterers', decorators' and large area scaffolds.Scaffold components which are not selected and loaded in accordance with this Appendix, and components for which no specific guidelines or tables are given in this appendix (e.g., joints, ties, components for wood pole scaffolds more than 60 feet in height, components for heavy-duty horse scaffolds, components made with other materials, and components with other dimensions, etc.) must be designed and constructed in accordance with the capacity requirements of § 1926.451(a), and loaded in accordance with § 1926.451(d)(1). ![]() However, the guidelines do not provide all the information necessary to build a complete system, and the employer is still responsible for designing and assembling these components in such a way that the completed system will meet the requirements of § 1926.451(a). An employer may use these guidelines and tables as a starting point for designing scaffold systems. This appendix provides non-mandatory guidelines to assist employers in complying with the requirements of subpart L of this part. (Non-mandatory) Appendix A to Subpart L of Part 1926-Scaffold Specifications
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |