3314.12.1 Standard designs.
BC § 3314.12.1
All wood pole scaffolds 40 feet (12 192 mm) high or less shall be constructed in accordance with the minimum nominal sizes and maximum spacings shown in Tables 3314.12.1(1) through 3314.12.1(6). Wood pole scaffolds more than 40 feet (12 192 mm) high shall be designed in accordance with Section 3314.3. Table 3314.12.1(1)Minimum Size and Maximum Spacing of Members of Single Wood Pole Light Duty Scaffolds. Uniformly Distributed Load Not to Exceed 25 psf Max. height of scaffold (ft)20' 40' 60' 75' Uniformly Distributed Load Not to Exceed 25 psf Max. height of scaffold (ft)20' 40' 60' 75' Poles or uprights (min.)2" x 4" 3" x 4" 4" x 4" Top 60'4" x 4"Lower Sect.4" x 6"Pole foundation (min.)2" x 9"Max. pole spacing (longitudinal)10' - 0" Max. width of scaffold 5' - 0" Bearers or putlogs (min.) 3" x 4" or 2" x 6" (on edge) Ledgers (minimum):With 6'-0" pole space1" x 6" (on edge) With 10'-0" pole space1 1/4" x 9" (on edge) Vertical spacing of ledgers (max.)7' - 0" Non-supporting stringers1" x 4" Tie-ins1" x 4" Bracing1" x 4" Planking:Not more than 6' span1 1/4" x 9" Up to 10' span2" x 9" Toeboards1" x 6" Guard rails2" x 4" Note: For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 47.88 Pa. Table 3314.12.1(2)Minimum Size and Maximum Spacing of Members of Single Wood Pole Medium Duty Scaffolds Uniformly Distributed Load Not to Exceed 50 psf Max. height of scaffold (ft)20' 40' 60' 75' Uniformly Distributed Load Not to Exceed 50 psf Max. height of scaffold (ft)20' 40' 60' 75' Poles or uprights (min)3" x 4" or 2" x 6" 4" x 4" 4" x 6" Top 60'4" x 6"Lower Sect.4" x 6"Pole foundation (min.)2" x 9" Max. pole spacing (longitudinal)8' - 0" Max. width of scaffold5' - 0" 8' - 0" Bearers or putlogs (min.) 3" x 4" or 2" x 6" (on edge) 3" x 5" or 2" x 9" (on edge) Max. spacing of bearers or putlogs8' - 0" Ledgers (minimum)2" x 9" (on edge) Vertical spacing of ledgers (max.)7' - 0" Non-supporting stringers1" x 6" or 1 1/4" x 4" Tie-ins1" x 6" Bracing1" x 6" Planking: Not more than 6' span 1 1/4" x 9 1/4" Up to 8' span2" x 9" Toeboards2" x 9" Guard rails 2" x 4" Note: For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 47.88 Pa. Table 3314.12.1(3)Minimum Size and Maximum Spacing of Members of Single Wood Pole Heavy Duty Scaffolds. Uniformly Distributed Load Not to Exceed 75 psf Max. height of scaffold (ft)20' 40' 60' 75' Uniformly Distributed Load Not to Exceed 75 psf Max. height of scaffold (ft)20' 40' 60' 75' Poles or uprights (min)3" x 4" or 2" x 6" 4" x 4" 4" x 6" Top 60'4" x 6"Lower Sect.6" x 6"Pole foundation (min.)2" x 9" Max. pole spacing (longitudinal)6' - 0" Max. width of scaffold5' - 0" 8' - 0" Bearers or putlogs (min.) 3" x 5" 3" x 6" or 2" x 9" Max. spacing of bearers or putlogs6' - 0" Ledgers (minimum)2" x 9" (on edge) Vertical spacing of ledgers (max.)7' - 0" Non-supporting stringers2" x 4" Tie-ins1" x 6" Bracing1" x 6" Planking2" x 9" Toeboards2" x 9" Guard rails2" x 4" Note: For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 47.88 Pa. Table 3314.12.1(4)Minimum Size and Maximum Spacing of Members of Independent Wood Pole Light Duty Scaffolds Uniformly Distributed Load Not to Exceed 25 psf Max. height of scaffold (ft)20' 40' 60' 75' Uniformly Distributed Load Not to Exceed 25 psf Max. height of scaffold (ft)20' 40' 60' 75' Poles or uprights (min)2" x 4" 3" x 4" or 2" x 6" 4" x 4" Top 60'4" x 6"Lower Sect.6" x 6"Pole foundation (min.)2" x 9" Max. pole spacing (longitudinal):With 1 1/4" x 9" ledgers6' - 0" With 2" x 9" ledgers10' - 0" Max. pole spacing (transverse)10 - 0" a Ledgers (minimum)1 1/4" x 9" (on edge) or 2" x 9"Vertical spacing of ledgers (max.)7' - 0" Bearers (minimum)1 1/4" x 9" (on edge) Non-supporting stringers1" x 4" Bracing1" x 4" Planking:Not more than 6' span 1 1/4" x 9 1/4"Up to 8' span2" x 9" Toeboards1" x 6" Guard rails2" x 4" Note: For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 47.88 Pa. Note for Table 3314.12.1(4): a Total base dimension in both directions to be at least 25 percent of height. Table 3314.12.1(5)Minimum Size and Maximum Spacing Members of Independent Wood Pole Medium Duty Scaffolds Uniformly Distributed Load Not to Exceed 50 psf Max. height of scaffold (ft)20' 40' 60' 75' Poles or uprights (min)3" x 4" or 2" x 6" 4" x 4" 4" x 6" Top 60'14" x 6"Lower Sect.6" x 6"Pole foundation (min.)2" x 9" Max. pole spacing (longitudinal)8' - 0" Max. pole spacing (transverse)10' - 0" aLedgers (minimum)2" x 9" (on edge) Vertical spacing of ledgers (max.)6' - 0" Bearers (minimum)2" x 9" (on edge) Non-supporting stringers1 1/4" x 4" or 1" x 6" Bracing1" x 6" Planking:Not more than 6' span 1 1/4" x 9 1/4"Up to 6' span2" x 9" Toeboards2" x 9" Guard rails2" x 4" Note: For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 47.88 Pa. Note for Table 3314.12.1(5): a Total base dimension in both directions to be at least 25 percent of height. Table 3314.12.1(6)Minimum Size and Maximum Spacing of Members of Independent Wood Pole Heavy Duty Scaffolds Uniformly Distributed Load Not to Exceed 75 psf Max. height of scaffold (ft)20' 40' 60' 75' Uniformly Distributed Load Not to Exceed 75 psf Max. height of scaffold (ft)20' 40' 60' 75' Poles or uprights (min)4" x 4" 4" x 4" 4" x 6" Top 60'4" x 6"Lower Sect.6" x 6"Pole foundation (min.)2" x 9" Max. pole spacing (longitudinal)6' - 0" a Max. pole spacing (transverse)10' - 0" a Ledgers (minimum)2" x 9" (on edge) Vertical spacing of ledgers (max.)5' - 0" Bearers (minimum)2" x 9" (on edge) Non-supporting stringers1 1/4" x 9 1/4"Bracing1" x 6" Planking2" x 9" Toeboards2" x 9" Guard rails2" x 4" Note: For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 47.88 Pa. Note for Table 3314.12.1(6): a Total base dimension in both directions to be at least 25 percent of height.
