Page 283 - Safety Memo

B. Scaffold-specific requirements j. Trucks or vehicles that have scaffolds attached to
them shall have a device in use whenever employees
After reviewing the general requirements for scaffolds, refer are on the scaffold that prevents swaying or listing of
to the regulations listed below (and any other applicable the platforms. 1646(h)
SOs) for the specific type(s) of scaffold in use to determine
whether these requirements replace or augment the general k. Employees may ride on a rolling scaffold moved by
requirements. others below if the following conditions exist: 1646(i)
The requirements listed below are unique to each specific type 1. The floor or surface is within 3 degrees of level,
of scaffold listed: and free from pits, holes, or obstructions.
1. Tubular welded scaffold systems 1644 2. The minimum dimension of the scaffold base,
when ready for rolling, is at least 1/2 of the height.
These scaffold systems are commercially fabricated and Outriggers, if used, shall be installed on both
must meet the following requirements: sides of staging.
a. Frames must nest with coupling or stacking pins to 3. The wheels are equipped with rubber or similar
provide proper vertical alignment. 1644(c)(5) resilient tires. For towers 50 ft. or over, metal
b. Frame panels must be vertically pinned if uplift may wheels may be used.
occur. 1644(c)(6) 4. The manual force used to move the scaffold shall
2. Tower and rolling scaffolds 1646 be applied as close to the base as practicable,
but not more than 5 ft. (1.5 meters) above the
The specifications for tower and rolling scaffolds are as supporting surface of the scaffold.
follows:
5. Before a scaffold is moved, each employee on the
a. The “height-to-base” must not exceed 3:1 unless the scaffold shall be made aware of the move.
scaffold is secured. 1646(a)
6. No employee shall be on any part of the scaffold
b. A screw jack must extend 1/3 of its length into the leg that extends outward beyond the wheels,
tube and the exposed thread must not exceed casters, or other supports.
12 inches. 1646(b)(2)
l. Employees may ride and move on a Self-Propelled
c. Two wheels or casters must swivel; all four must lock. rolling scaffold while on the platform without
1646(c) assistance from others below, provided the following
conditions are met: 1646(j)
d. A fully planked platform is required. 1646(e)
1. All of the provisions in 1646(i) shall be met, except
e. All frame and center joints shall be locked together by that the scaffold need not be moved by others
lock pins, bolts, or equivalent fastenings. 1646(d) below.
f. The scaffold must have horizontal diagonal bracing 2. The scaffold platform shall not be more than 4 ft.
(see Illustration 9). 1646(b) above the floor level.
g. Railings are required if the platform is 7 1/2 ft. or more 3. The working platform shall be no less than
above grade. 1646(b) 20 inches in width with a maximum 1-inch space
h. Ladders or other unstable objects shall not be placed between platform planks.
on top of rolling scaffolds to gain greater height. 4. Wheels or casters of rolling scaffolds shall be
1646(f) provided with an effective locking device that is
i. When scaffolds are built on motor trucks or vehicles, used in accordance with 1646(c); or rolling
they must be rigidly attached to the truck or vehicle. scaffolds shall be provided with an effective
1646(g) device that is used to prevent movement of the

124 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 Cal/OSHA Pocket Guide for the Construction Industry | June 2019 125