1. (1) You must make sure outrigger beams are made of structural metal or equivalent strength material.

2. (2) You must stabilize the inboard ends of outrigger beams by using either:

   1. (a) Bolts or other direct connections to the floor or roof deck; or

   2. (b) Counterweights and tiebacks.

      EXEMPTION:

      Masons' multipoint adjustable scaffold outrigger beams cannot be stabilized by counterweights.

3. (3) You must make sure, before the scaffold is used, that a competent person:

   1. (a) Evaluates the direct connections; and
   2. (b) Confirms that the supporting surfaces can support the loads placed on them.

4. (4) You must make sure suspended scaffold outrigger beams are all of the following:

   1. (a) Restrained to prevent moving;
   2. (b) Provided with stop bolts or shackles at both ends;
   3. (c) Securely fastened together with the flanges turned out when channel iron beams are used in place of I-beams;
   4. (d) Set and maintained with the web in a vertical position;
   5. (e) Placed so the suspension rope is centered over the stirrup.

5. (5) You must place outrigger beams at a right angle (perpendicular) to their bearing support.

   EXEMPTION:	Outrigger beams can be placed at other than a right angle (perpendicular) if:
   	1. You can demonstrate that immovable obstructions make it impossible to place the beams at a right angle (perpendicular) to their bearing support; and
   	2. Opposing angle tiebacks are used.

   Note:

   The angle between the outrigger beam and the bearing support is usually the same as the angle between the outrigger beam and the face of the building or structure.

[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050. WSR 15-23-086, § 296-874-30004, 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, § 296-874-30004, filed 12/7/04, effective 3/1/05.]