Section 296-874-40004 - Prevent supported scaffolds from tipping(1) You must make sure supported scaffolds with a height to least base dimension ratio of greater than four to one are prevented from tipping by one or more of the following: (d) Other equivalent means. Note: | The least base dimension includes outriggers, if used. |
(2) You must install guys, ties, and braces where horizontal members support both the inner and outer legs of the scaffold. (3) You must install guys, ties, and braces:(a) According to the scaffold manufacturer's recommendations; or(b) At all points where the following horizontal and vertical planes meet: (i) First vertical level at a height equal to four times the least base dimension.(ii) Subsequent vertical levels every: (A) Twenty feet (6.1 m) or less for scaffolds having a width of three feet (0.91 m) or less;(B) Twenty six feet (7.9 m) or less for scaffolds more than three feet (0.91 m) wide.(iii) Horizontally at: (A) Each end of the scaffold; and(B) Intervals of thirty feet (9.1 m) or less. Note: | The thirty-foot horizontal intervals are measured from one end of the scaffold to the other. |
(4) You must make sure the highest level of guys, ties, or braces is no further from the top of the scaffold than a distance equal to four times the least base dimension. (5) You must make sure scaffolds that have an eccentric load applied or transmitted to them, such as a cantilevered work platform, are prevented from tipping by one or more of the following: (e) Other equivalent means.Wash. Admin. Code § 296-874-40004
Amended by WSR 15-23-086, Filed 11/17/2015, effective 12/18/2015Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. 07-17-026, § 296-874-40004, filed 8/7/07, effective 10/6/07; 07-03-163, § 296-874-40004, filed 1/24/07, effective 4/1/07; 05-01-054, § 296-874-40004, filed 12/7/04, effective 3/1/05.