1. (1) You must reinforce wood scaffolds with gussets on both sides of each corner.

2. (2) You must make sure diagonal braces are installed:

   1. (a) On all sides of each square;
   2. (b) Between squares on the front and back sides of the scaffold;
   3. (c) Extending from the bottom of each square to the top of the next square.

3. (3) Make sure scaffolds meet all of the following:

   1. (a) Are no more than three tiers high;
   2. (b) Are constructed and arranged so that each square rests directly above another square;

   3. (c) The upper tiers:

      1. (i) Stand on a continuous row of planks laid across the next lower tier; and
      2. (ii) Are nailed down or otherwise secured to prevent displacement.

[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-874-40014, filed 11/17/15, effective 12/18/15. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, 49.17.060. WSR 05-01-054, § 296-874-40014, filed 12/7/04, effective 3/1/05.]