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Under One Roof

Canadian Roofing Reference Manual

1.7.3 Wood Staging and Scaffolds

Half-Horse Scaffold

A half-horse or lean-to scaffold is so called because the inner end of the bearer is supported by leaning against the wall. Although it is restricted in its uses, a half-horse scaffold has an advantage, as it may rest against a finished portion of the wall while work above continues.

Pole Scaffold

Pole scaffolds can be constructed as single or double pole. “Pole” is actually the vertical leg.

Ladder Jack Scaffolds

A ladder jack scaffold refers to a scaffold that is erected by attaching a bracket to a ladder to support the scaffold planks. The following requirements should be kept in mind when using ladder jacks:

  • Use for light work or for work of short duration.
  • The maximum height is 4.5 m (15 ft) above the grade.
  • The supporting ladders must not be more than 3 m (10 ft) apart.
  • Ladders must be tied in position at the top and the bottom.
  • The support brackets should be supported by the side rails of the ladder or have at least
  • 14.3 mm (9/16 in) of width resting on the ladder rung.
  • There should be no more than two workers on the scaffold at one time.