Roofing contractors use ladder-jack scaffolds for various types
of work, including gutter and metal coping installations, soffit
and fascia details, mansard roof installations and siding
applications. Occupational Safety and Health Administration (OSHA)
rules related to setup and use of ladder-jack scaffolds are found
in "Subpart L—Scaffolds" of OSHA's construction regulations
and contain specific requirements for roofing contractors that
apply to all ladder-jack scaffold setups without regard for the
task at hand.
A ladder-jack scaffold simply is a platform or plank suspended
on supports, or jacks, which are attached to the rungs of two or
more ladders. The ladders are set at intervals apart from each
other to accommodate the length of the platform or plank and
provide intermediate support if required. A worker then can perform
tasks along a portion of a building's edge by working off the plank
instead of making multiple moves with a single ladder.
OSHA requires the platform or plank portion of a ladder-jack
scaffold to be at least 12 inches wide. Ordinarily, aluminum
scaffold planks—either fixed-length or
extension-type—are used with ladder jacks because of aluminum
scaffold planks' light weight and load capacity. Planks available
from major scaffold equipment manufacturers generally are designed
to comply with OSHA's 12-inch width requirement, and some models
are 14 inches wide. They also should have a posted load rating in
pounds that—in the case of fixed planks—may allow two
workers to be on a...
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