Document ID: chunk:federal_register_of_legislation:F2016L00411:front:0:p31
Version: federal_register_of_legislation:F2016L00411
Segment Type: other
Provision Reference: 
Character Range: 76113–78567

to which a person or object may fall, a copy of the detailed design drawings for the scaffold, prepared by a competent person, should be kept on site.

B2: TIMBER SCAFFOLDS - MAXIMUM 2 METRE LIFT HEIGHTS

2.1 Scaffold components
Load bearing structural members used or intended to be used in the construction of a timber scaffold in accordance with this part, including standards, ledgers, guardrails, midrails, putlogs, braces, ties and rakers, shall have a stress grading of not less than F8 unseasoned hardwood or MGP 12 seasoned pine.
The minimum cross-sectional dimensions of structural members should be as specified in Sections 2.4 to 2.9 in this appendix. The timber sizes listed in this section are the nominal sizes for rough sawn timber. Where this appendix nominates an alternative use of a higher grade seasoned dressed timber, the equivalent dressed size may be used.
All components intended for use in the construction of a timber scaffold must be visually inspected for defects prior to each use and components found to be in an unserviceable condition must not be used.

2.2 Working platform
Working platforms supported by timber scaffolds should be classified as:
    * light duty, for loads (persons and materials) of up to 225 kg per bay
    * medium duty, for loads (persons and materials) of up to 450 kg per bay
    * heavy duty, for loads (persons and materials) of up to 675 kg per bay.
The minimum width and length of working platforms should be:
    * 450 mm for light duty working platforms
    * 900 mm for medium duty working platforms
    * 1000 mm for heavy duty working platforms.
The maximum spans of solid timber scaffold planks are given in Table 1.
Scaffold planks forming a working platform should:
    * be of uniform thickness to prevent trip hazards
    * be closely laid across the full width of the scaffold to prevent traps and to prevent material or debris from falling through gaps
    * extend beyond their end putlogs not less than 150 mm nor more than 250 mm
    * be supported by putlogs at spacings not greater than the maximum spacing marked on the plank
    * except at returns or on unusually shaped profiles, be butted rather than lapped
    * where necessary, be adequately secured against uplift or displacement.

Table 1 Maximum span of solid timber scaffold planks complying with AS 1577

Nominal thickness of plank (mm)  Maximum span between trestles (m)

32 (hardwood only)               1.0