020301bA Scaffolding - Part A Flashcards
Mud sills should extend ____ mm past year centreline of the leg.
300 mm
Do backfill under mud sills. T or F
F
Planks for scaffolds must be atleast ___ mm thick.
51 mm (2”)
Wood planks can not span more than ____ on a light duty scaffold and or ___ on a heavy duty scaffold.
- 0
2. 3
Gaps between planks should not extend more than ___ mm.
25 mm
Platforms must be atleast ___ mm wide for light duty scaffolds.
500 mm
Scaffold platforms must be at least ____ m side for heavy duty scaffold.
1 m
When are guard rails needed on a scaffold?
When 3.0 high, fall hazard, when scaffold is 12” from wall or structure being worked on.
Guardrails must be tied to standards not more than 3.0 m. T or F
T
Toeboards are required 9’ scaffolds more than 3.5 m high. T or F
T
Transverse bracing should occur every 6.1 m horizontally and on each lift at both ends of the scaffold. T or F
T
Mud sills should be atleast 38 mm x 286 mm. T or F
T
Once a scaffold reaches a height-to-width ratio of ____ it must be tied off.
3:1
Tied at intervals 6.4 horizontally and 4.6 vertically. T or F
T
Scaffold systems are designed with a safety factor of what?
4:1
