1.Uprights (Standards): 38 mm by 89
mm for scaffolds up to 6 m. 89 mm by 89 mm for scaffolds up to 15 m.
Uprights are spaced not more than 10 feet (3 m) apart supporting
loads of not more than 1.2 kPa. The spacing for heavy duty scaffolds is
not more than 7 feet (2.1 m).
2.Bearers (Ledgers): 19 mm by 140 mm up to 3.3 feet (1 m) and 38 mm by 140 mm up to 5 feet (1.5 m).
3.Ledgers (Ribbon Boards): 19 mm by 140 mm.
4.Braces: 19 mm by 140 mm.
5.Platform Planks: 2 inchs by 10 inches 51 mm by 254 mm. The minimum
platform width is 20 inches (508 mm). Minimum 6 inches (152 mm) and
maximum 12 inches (305 mm) platform extention beyond supporting member.
Planks must be fitted with cleats or nails to retain them on the
supports. Maximum horizontal open space between the platform edges and
the guard rails is 10 inches (254 mm).
6.Toe Board: 19 mm or 38 mm by 140 mm. Toe boards must be approximately
4 inches (102 mm) in height above the platform. The toe board clearance
between its low edge and the platform must not be more than 1/2 inch
(13 mm).
7.Top Guard Rail: 38 mm by 89 mm.
8.Intermediate Guard Rail: 19 mm by 140 mm.
9.Mud Sill: 38 mm by 184 mm.
10.Wall Scabs: 38 mm by 140 mm, fastened to wall by nails into wall
studs or by bolts through wall. 400 mm is minimal length of wall scabs.
11.Bearer Blocks: 38 mm by 140 mm, fastened to wall scabs by nails.
