Structural Members | Light duty (Up to 25 pounds per square foot) | | Heavy duty (25 to 75 pounds per square foot) |
Height in feet | | Height in feet |
< 24 | ˃24<40 | 40<60 | <24 | ˃24<40 | 40<60 |
Poles or uprights (in inches) . . . . | 2x4 | 3x4 or 2x6 | 4x4 | 3x4 | 4x4 | 4x6 |
Bearers (in inches) . . . . | 2x4 | 2x6 | 2x6 | 2x8 | 2x8 | 2x10 |
Ledgers (in inches) . . . . | 2x6 | 2x6 | 2x6 | 2x8 | 2x8 | 2x8 |
Stringer (not supporting bearers) (in inches) . . . . | 1x6 | 1x6 | 1x6 | 1x6 | 1x6 | 1x6 |
Braces (in inches) . . . . | 1x4 | 1x6 | 1x6 | 1x6 | 1x6 | 1x6 |
Pole spacing— longitudinally (in feet) . . . . | 7 1/2 | 7 1/2 | 7 1/2 | 7 | 7 | 7 |
Pole spacing— transversely (in feet) . . . . | 6 1/2 min | 7 1/2 min | 8 1/2 min | 6 1/2 | 10 | 10 |
Ledger spacing— vertically (in feet) . . . . | 7 | 7 | 7 | 4 1/2 | 4 1/2 | 4 1/2 |
TABLE E-2
SPECIFICATIONS FOR SIDE RAILS OF LADDERS
Length (in feet) | Cross section (in inches) |
At ends | At center |
15 . . . . | 1 7/8 x 2 3/4 | | 1 7/8 x 3 3/4 |
16 . . . . | 1 7/8 x 2 3/4 | | 1 7/8 x 3 3/4 |
17 . . . . | 1 7/8 x 3 | | 1 7/8 x 4 |
18 . . . . | 1 7/8 x 3 | | 1 7/8 x 4 |
20 . . . . | 1 7/8 x 3 | | 1 7/8 x 4 1/2 |
24 . . . . | 1 7/8 x 3 | | 1 7/8 x 4 1/2 |
TABLE E-3
SPECIFICATIONS FOR THE CONSTRUCTION OF HORSES
Structural | Height in feet |
Members | <10 | ˃10<16 | 16<20 |
| Inches | Inches | Inches |
Legs . . . . | 2x4 | 3x4 | 4x6 |
Bearers or headers | 2x6 | 2x8 | 4x6 |
Crossbraces . . . . | 2x4 or 1x8 | 2x4 | 2x6 |
Longitudinal braces . . . . | 2x4 | 2x6 | 2x6 |
TABLE E-4
SAFE CENTER LOADS FOR SCAFFOLD PLANK
OF 1,100 POUNDS FIBRE STRESS
[Codification note: The graphic presentation of this table has been varied in order that it would fall within the printing specifications for the Washington Administrative Code. The following table had lumber dimensions in the table heading typed in vertically across the page while the remainder of the table was typed horizontally on the page. The "Span in Feet" materials (6 through 16) which ran top to bottom has been switched to run left to right on the page. The "Lumber dimensions in inches" which ran left to right on the page has been switched to run top to bottom on the page.]
Lumber dimensions in inches | Span in Feet |
6 | 8 | 10 | 12 | 14 | 16 |
A-2 x 10 | | | | | | |
B-1 5/8 x 9 1/2 | 256 | 192 | 153 | 128 | 110 | ... |
A-2 x 12 | | | | | | |
B-1 5/8 x 11 1/2 | 309 | 232 | 186 | 155 | 133 | 116 |
A-3 x 8 | | | | | | |
B-2 5/8 x 7 1/2 | 526 | 395 | 316 | 263 | 225 | 197 |
A-3 x 10 | | | | | | |
B-2 5/8 x 9 1/2 | 667 | 600 | 400 | 333 | 286 | 250 |
A-3 x 12 | | | | | | |
B-2 5/8 x 11 1/2 | 807 | 605 | 484 | 404 | 346 | 303 |
(A)—Rough lumber. |
(B)—Dressed lumber. |
TABLE G-1
NUMBER AND SPACING OF U-BOLT WIRE
ROPE CLIPS
| | Number of Clips |
Improved plow steel rope diameter inches | | Drop forged | Other material | Minimum spacing (inches) |
* | . . . . | ... | ... | | | |
1/2 | . . . . | 3 | 4 | | 3 | |
5/8 | . . . . | 3 | 4 | | 3 3/4 | |
3/4 | . . . . | 4 | 5 | | 4 1/2 | |
7/8 | . . . . | 4 | 5 | | 5 1/4 | |
1 | . . . . | 4 | 6 | | 6 | |
1 1/8 | . . . . | 5 | 6 | | 6 3/4 | |
1 1/4 | . . . . | 5 | 7 | | 7 1/2 | |
1 3/8 | . . . . | 6 | 7 | | 8 1/4 | |
1 1/2 | . . . . | 6 | 8 | | 9 | |
*Three clips shall be used on wire size less than 1/2-inch diameter. |
TABLE G-2
MAXIMUM ALLOWABLE WEAR AT
ANY POINT OF LINK
Chain size in inches | Maximum allowable wear in fraction of inches |
1/4 (9/32). . . . | 3/64 |
3/8. . . . | 5/64 |
1/2. . . . | 7/64 |
5/8. . . . | 9/64 |
3/4. . . . | 5/32 |
7/8. . . . | 1/64 |
1. . . . | 3/16 |
1 1/8. . . . | 7/32 |
1 1/4. . . . | 1/4 |
1 3/8. . . . | 9/32 |
1 1/2. . . . | 5/16 |
1 3/4. . . . | 1/32 |
[Statutory Authority: RCW
49.17.010,
49.17.040,
49.17.050, and
49.17.060. WSR 17-18-075, § 296-304-07011, filed 9/5/17, effective 10/6/17. Statutory Authority: RCW
49.17.010,
49.17.040,
49.17.050,
49.17.060 and chapter
49.17 RCW. WSR 12-24-071, § 296-304-07011, filed 12/4/12, effective 1/4/13. Statutory Authority: RCW
49.17.010,
49.17.040,
49.17.050, and
49.17.060. WSR 03-04-099, § 296-304-07011, filed 2/4/03, effective 8/1/03; Order 74-25, § 296-304-07011, filed 5/7/74.]