1910.28—Safety requirements for scaffolding.
(a) General requirements for all scaffolds.
(1)
Scaffolds shall be furnished and erected in accordance with this standard for persons engaged in work that cannot be done safely from the ground or from solid construction, except that ladders used for such work shall conform to § 1910.25 and § 1910.26.
(2)
The footing or anchorage for scaffolds shall be sound, rigid, and capable of carrying the maximum intended load without settling or displacement. Unstable objects such as barrels, boxes, loose brick, or concrete blocks shall not be used to support scaffolds or planks.
(4)
Scaffolds and their components shall be capable of supporting without failure at least four times the maximum intended load.
(5)
Scaffolds and other devices mentioned or described in this section shall be maintained in safe condition. Scaffolds shall not be altered or moved horizontally while they are in use or occupied.
(6)
Any scaffold damaged or weakened from any cause shall be immediately repaired and shall not be used until repairs have been completed.
(8)
All load-carrying timber members of scaffold framing shall be a minimum of 1,500 f. (Stress Grade) construction grade lumber. All dimensions are nominal sizes as provided in the American Lumber Standards, except that where rough sizes are noted, only rough or undressed lumber of the size specified will satisfy minimum requirements. (Note: Where nominal sizes of lumber are used in place of rough sizes, the nominal size lumber shall be such as to provide equivalent strength to that specified in tables D-7 through D-12 and D-16.)
(9)
All planking shall be Scaffold Grade as recognized by grading rules for the species of wood used. The maximum permissible spans for 2- × 9-inch or wider planks are shown in the following table:
| Material | Full thickness undressed lumber | Nominal thickness lumber | ||||||
|---|---|---|---|---|---|---|---|---|
| Working load (p.s.f.) | 25 | 50 | 75 | 25 | 50 | |||
| Permissible span (ft.) | 10 | 8 | 6 | 8 | 9 |
Code of Federal Regulations
(10)
Nails or bolts used in the construction of scaffolds shall be of adequate size and in sufficient numbers at each connection to develop the designed strength of the scaffold. Nails shall not be subjected to a straight pull and shall be driven full length.
(13)
Scaffold planks shall extend over their end supports not less than 6 inches nor more than 18 inches.
(14)
The poles, legs, or uprights of scaffolds shall be plumb, and securely and rigidly braced to prevent swaying and displacement.
(17)
Scaffolds shall be provided with a screen between the toeboard and the guardrail, extending along the entire opening, consisting of No. 18 gauge U.S. Standard Wire one-half-inch mesh or the equivalent, where persons are required to work or pass under the scaffolds.
(19)
Employees shall not work on scaffolds which are covered with ice or snow, unless all ice or snow is removed and planking sanded to prevent slipping.
(20)
Tools, materials, and debris shall not be allowed to accumulate in quantities to cause a hazard.
(21)
Only treated or protected fiber rope shall be used for or near any work involving the use of corrosive substances or chemicals.
(22)
Wire or fiber rope used for scaffold suspension shall be capable of supporting at least six times the intended load.
(23)
When acid solutions are used for cleaning buildings over 50 feet in height, wire rope supported scaffolds shall be used.
(26)
Scaffolds shall be secured to permanent structures, through use of anchor bolts, reveal bolts, or other equivalent means. Window cleaners' anchor bolts shall not be used.
(27)
Special precautions shall be taken to protect scaffold members, including any wire or fiber ropes, when using a heat-producing process.
(b) General requirements for wood pole scaffolds.
(1)
Scaffold poles shall bear on a foundation of sufficient size and strength to spread the load from the poles over a sufficient area to prevent settlement. All poles shall be set plumb.
(2)
Where wood poles are spliced, the ends shall be squared and the upper section shall rest squarely on the lower section. Wood splice plates shall be provided on at least two adjacent sides and shall not be less than 4 feet 0 inches in length, overlapping the abutted ends equally, and have the same width and not less than the cross-sectional area of the pole. Splice plates of other materials of equivalent strength may be used.
(4)
All pole scaffolds shall be securely guyed or tied to the building or structure. Where the height or length exceeds 25 feet, the scaffold shall be secured at intervals not greater than 25 feet vertically and horizontally.
(5)
Putlogs or bearers shall be set with their greater dimensions vertical, long enough to project over the ledgers of the inner and outer rows of poles at least 3 inches for proper support.
(6)
Every wooden putlog on single pole scaffolds shall be reinforced with a 3/16 ×2-inch steel strip or equivalent secured to its lower edge throughout its entire length.
(7)
Ledgers shall be long enough to extend over two pole spaces. Ledgers shall not be spliced between the poles. Ledgers shall be reinforced by bearing blocks securely nailed to the side of the pole to form a support for the ledger.
(8)
Diagonal bracing shall be provided to prevent the poles from moving in a direction parallel with the wall of the building, or from buckling.
(9)
Cross bracing shall be provided between the inner and outer sets of poles in independent pole scaffolds. The free ends of pole scaffolds shall be cross braced.
(10)
Full diagonal face bracing shall be erected across the entire face of pole scaffolds in both directions. The braces shall be spliced at the poles.
(11)
Platform planks shall be laid with their edges close together so the platform will be tight with no spaces through which tools or fragments of material can fall.
(12)
Where planking is lapped, each plank shall lap its end supports at least 12 inches. Where the ends of planks abut each other to form a flush floor, the butt joint shall be at the centerline of a pole. The abutted ends shall rest on separate bearers. Intermediate beams shall be provided where necessary to prevent dislodgment of planks due to deflection, and the ends shall be nailed or cleated to prevent their dislodgment.
(13)
When a scaffold turns a corner, the platform planks shall be laid to prevent tipping. The planks that meet the corner putlog at an angle shall be laid first, extending over the diagonally placed putlog far enough to have a good safe bearing, but not far enough to involve any danger from tipping. The planking running in the opposite direction at right angles shall be laid so as to extend over and rest on the first layer of planking.
(14)
When moving platforms to the next level, the old platform shall be left undisturbed until the new putlogs or bearers have been set in place, ready to receive the platform planks.
(15)
Guardrails not less than 2 × 4 inches or the equivalent and not less than 36 inches or more than 42 inches high, with a mid-rail, when required, of 1 × 4-inch lumber or equivalent, and toeboards, shall be installed at all open sides on all scaffolds more than 10 feet above the ground or floor. Toeboards shall be a minimum of 4 inches in height. Wire mesh shall be installed in accordance with paragraph (a)(17) of this section.
(16)
All wood pole scaffolds 60 feet or less in height shall be constructed and erected in accordance with tables D-7 through D-12 of this section. If they are over 60 feet in height they shall be designed by a registered professional engineer and constructed and erected in accordance with such design. A copy of the typical drawings and specifications shall be made available to the employer and for inspection purposes.
| Maximum height of scaffold | ||
|---|---|---|
| 20 feet | 60 feet | |
| Uniformly distributed load | Not to exceed 25 pounds per square foot. | |
| Poles or uprights | 2 by 4 in | 4 by 4 in. |
| Pole spacing (longitudinal) | 6 ft. 0 in | 10 ft. 0 in. |
| Maximum width of scaffold | 5 ft. 0 in | 5 ft. 0 in. |
| Bearers or putlogs to 3 ft. 0 in. width | 2 by 4 in | 2 by 4 in. |
| Bearers or putlogs to 5 ft. 0 in. width | 2 by 6 in. or 3 by 4 in | 2 by 6 in. or 3 by 4 in.(rough). |
| Ledgers | 1 by 4 in | 11/4 by 9 in. |
| Planking | 11/4 by 9 in. (rough) | 2 by 9 in. |
| Vertical spacing of horizontal members | 7 ft. 0 in | 7 ft. 0 in. |
| Bracing, horizontal and diagonal | 1 by 4 in | 1 by 4 in. |
| Tie-ins | 1 by 4 in | 1 by 4 in. |
| Toeboards | 4 in. high (minimum) | 4 in. high (minimum). |
| Guardrail | 2 by 4 in | 2 by 4 in. |
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Code of Federal Regulations
135
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| All members except planking are used on edge. | ||
| Uniformly distributed load | Not to exceed 50 pounds per square foot. |
| Maximum height of scaffold | 60 ft. |
| Poles or uprights | 4 by 4 in. |
| Pole spacing (longitudinal) | 8 ft. 0 in. |
| Maximum width of scaffold | 5 ft. 0 in. |
| Bearers or putlogs | 2 by 9 in. or 3 by 4 in. |
| Spacing of bearers or putlogs | 8 ft. 0 in. |
| Ledgers | 2 by 9 in. |
| Vertical spacing of horizontal members | 9 ft. 0 in. |
| Bracing, horizontal | 1 by 6 in. or 11/4 by 4 in. |
| Bracing, diagonal | 1 by 4 in. |
| Tie-ins | 1 by 4 in. |
| Planking | 2 by 9 in. |
| Toeboards | 4 in. high (minimum). |
| Guardrail | 2 by 4 in. |
| All members except planking are used on edge. | |
| Uniformly distributed load | Not to exceed 75 pounds per square foot. |
| Maximum height of scaffold | 60 ft. |
| Poles or uprights | 4 by 4 in. |
| Pole spacing (longitudinal) | 6 ft. 0 in. |
| Maximum width of scaffold | 5 ft. 0 in. |
| Bearers or putlogs | 2 by 9 in. or 3 by 5 in. (rough). |
| Spacing of bearers or putlogs | 6 ft. 0 in. |
| Ledgers | 2 by 9 in. |
| Vertical spacing of horizontal members | 6 ft. 6 in. |
| Bracing, horizontal and diagonal | 2 by 4 in. |
| Tie-ins | 1 by 4 in. |
| Planking | 2 by 9 in. |
| Toeboards | 4 in. high (minimum). |
| Guardrail | 2 by 4 in. |
| All members except planking are used on edge. | |
| Maximum height of scaffold | ||
|---|---|---|
| 20 feet | 60 feet | |
| Uniformly distributed load | Not to exceed 25 pounds per square foot. | |
| Poles or uprights | 2 by 4 in | 4 by 4 in. |
| Pole spacing (longitudinal) | 6 ft. 0 in | 10 ft. 0 in. |
| Pole spacing (transverse) | 6 ft. 0 in | 10 ft. 0 in. |
| Ledgers | 11/4 by 4 in | 11/4 by 9 in. |
| Bearers to 3 ft. 0 in. span | 2 by 4 in | 2 by 4 in. |
| Bearers to 10 ft. 0 in. span | 2 by 6 in. or 3 by 4 in | 2 by 9 (rough) or 3 by 8 in. |
| Planking | 11/4 by 9 in | 2 by 9 in. |
| Vertical spacing of horizontal members | 7 ft. 0 in | 7 ft. 0 in. |
| Bracing, horizontal and diagonal | 1 by 4 in | 1 by 4 in. |
| Tie-ins | 1 by 4 in | 1 by 4 in. |
| Toeboards | 4 in. high | 4 in. high (minimum). |
| Guardrail | 2 by 4 in | 2 by 4 in. |
| All members except planking are used on edge. | ||
| Uniformly distributed load | Not to exceed 50 pounds per square foot. |
| Maximum height of scaffold | 60 ft. |
| Poles or uprights | 4 by 4 in. |
| Pole spacing (longitudinal) | 8 ft. 0 in. |
| Pole spacing (transverse) | 8 ft. 0 in. |
| Ledgers | 2 by 9 in. |
| Vertical spacing of horizontal members | 6 ft. 0 in. |
| Spacing of bearers | 8 ft. 0 in. |
| Bearers | 2 by 9 in. (rough) or 2 by 10 in. |
| Bracing, horizontal | 1 by 6 in. or 11/4 by 4 in. |
| Bracing, diagonal | 1 by 4 in. |
| Tie-ins | 1 by 4 in. |
| Planking | 2 by 9 in. |
| Toeboards | 4 in. high (minimum). |
| Guardrail | 2 by 4 in. |
| All members except planking are used on edge. | |
| Uniformly distributed load | Not to exceed 75 pounds per square foot. |
| Maximum height of scaffold | 60 ft. |
| Poles or uprights | 4 by 4 in. |
| Pole spacing (longitudinal) | 6 ft. 0 in. |
| Pole spacing (transverse) | 8 ft. 0 in. |
| Ledgers | 2 by 9 in. |
| Vertical spacing of horizontal members | 4 ft. 6 in. |
| Bearers | 2 by 9 in. (rough). |
| Bracing, horizontal and diagonal | 2 by 4 in. |
| Tie-ins | 1 by 4 in. |
| Planking | 2 by 9 in. |
| Toeboards | 4 in. high (minimum). |
| Guardrail | 2 by 4 in. |
| All members except planking are used on edge. | |
| Uniformly distributed load | Not to exceed 25 p.s.f. |
| post spacing (longitudinal) | 10 ft. 0 in. |
| Post spacing (transverse) | 6 ft. 0 in. |
| Working levels | Additional planked levels | Maximum height |
|---|---|---|
| 1 | 8 | 125 ft. |
| 2 | 4 | 125 ft. |
| 3 | 0 | 91 ft. 0 in. |
| Uniformly distributed load | Not to exceed 50 p.s.f. |
| Post spacing (longitudinal) | 8 ft. 0 in. |
| Post spacing (transverse) | 6 ft. 0 in. |
| Working levels | Additional planked levels | Maximum height |
|---|---|---|
| 1 | 6 | 125 ft. |
| 2 | 0 | 78 ft. 0 in. |
| Uniformly distributed load | Not to exceed 75 p.s.f. |
| Post spacing (longitudinal) | 6 ft. 6 in. |
| Post spacing (transverse) | 6 ft. 0 in. |
| Working levels | Additional planked levels | Maximum height |
|---|---|---|
| 1 | 6 | 125 ft. |
(c) Tube and coupler scaffolds.
(1)
A light-duty tube and coupler scaffold shall have all posts, bearers, runners, and bracing of nominal 2-inch O.D. steel tubing. The posts shall be spaced no more than 6 feet apart by 10 feet along the length of the scaffold. Other structural metals when used must be designed to carry an equivalent load.
(2)
A medium-duty tube and coupler scaffold shall have all posts, runners, and bracing of nominal 2-inch O.D. steel tubing. Posts spaced not more than 6 feet apart by 8 feet along the length of the scaffold shall have bearers of nominal 2 1/2 -inch O.D. steel tubing. Posts spaced not more than 5 feet apart by 8 feet along the length of the scaffold shall have bearers of nominal 2-inch O.D. steel tubing. Other structural metals when used must be designed to carry an equivalent load.
(3)
A heavy-duty tube and coupler scaffold shall have all posts, runners, and bracing of nominal 2-inch O.D. steel tubing, with the posts spaced not more than 6 feet apart by 6 feet 6 inches along the length of the scaffold. Other structural metals when used must be designed to carry an equivalent load.
(4)
Tube and coupler scaffolds shall be limited in heights and working levels to those permitted in tables D-13, 14, and 15, of this section. Drawings and specifications of all tube and coupler scaffolds above the limitations in tables D-13, 14, and 15 of this section shall be designed by a registered professional engineer and copies made available to the employer and for inspection purposes.
(5)
All tube and coupler scaffolds shall be constructed and erected to support four times the maximum intended loads as set forth in tables D-13, 14, and 15 of this section, or as set forth in the specifications by a registered professional engineer, copies which shall be made available to the employer and for inspection purposes.
(8)
Runners shall be erected along the length of the scaffold located on both the inside and the outside posts at even height. Runners shall be interlocked to form continuous lengths and coupled to each post. The bottom runners shall be located as close to the base as possible. Runners shall be placed not more than 6 feet 6 inches on centers.
(9)
Bearers shall be installed transversely between posts and shall be securely coupled to the posts bearing on the runner coupler. When coupled directly to the runners, the coupler must be kept as close to the posts as possible.
(10)
Bearers shall be at least 4 inches but not more than 12 inches longer than the post spacing or runner spacing. Bearers may be cantilevered for use as brackets to carry not more than two planks.
(11)
Cross bracing shall be installed across the width of the scaffold at least every third set of posts horizontally and every fourth runner vertically. Such bracing shall extend diagonally from the inner and outer runners upward to the next outer and inner runners.
(12)
Longitudinal diagonal bracing shall be installed at approximately a 45-degree angle from near the base of the first outer post upward to the extreme top of the scaffold. Where the longitudinal length of the scaffold permits, such bracing shall be duplicated beginning at every fifth post. In a similar manner, longitudinal diagonal bracing shall also be installed from the last post extending back and upward toward the first post. Where conditions preclude the attachment of this bracing to the posts, it may be attached to the runners.
(13)
The entire scaffold shall be tied to and securely braced against the building at intervals not to exceed 30 feet horizontally and 26 feet vertically.
(14)
Guardrails not less than 2×4 inches or the equivalent and not less than 36 inches or more than 42 inches high, with a mid-rail, when required, of 1×4-inch lumber or equivalent, and toeboards, shall be installed at all open sides on all scaffolds more than 10 feet above the ground or floor. Toeboards shall be a minimum of 4 inches in height. Wire mesh shall be installed in accordance with paragraph (a)(17) of this section.
(d) Tubular welded frame scaffolds.
(1)
Metal tubular frame scaffolds, including accessories such as braces, brackets, trusses, screw legs, ladders, etc., shall be designed and proved to safely support four times the maximum intended load.
(3)
Scaffolds shall be properly braced by cross bracing or diagonal braces, or both, for securing vertical members together laterally, and the cross braces shall be of such length as will automatically square and aline vertical members so that the erected scaffold is always plumb, square, and rigid. All brace connections shall be made secure.
(4)
Scaffold legs shall be set on adjustable bases or plain bases placed on mud sills or other foundations adequate to support the maximum intended load.
(5)
The frames shall be placed one on top of the other with coupling or stacking pins to provide proper vertical alinement of the legs.
(6)
Where uplift may occur, panels shall be locked together vertically by pins or other equivalent suitable means.
(7)
Guardrails not less than 2 × 4 inches or the equivalent and not less than 36 inches or more than 42 inches high, with a mid-rail, when required, of 1- × 4-inch lumber or equivalent, and toeboards, shall be installed at all open sides on all scaffolds more than 10 feet above the ground or floor. Toeboards shall be a minimum of 4 inches in height. Wire mesh shall be installed in accordance with paragraph (a)(17) of this section.
(8)
All tubular metal scaffolds shall be constructed and erected to support four times the maximum intended loads.
(9)
To prevent movement, the scaffold shall be secured to the building or structure at intervals not to exceed 30 feet horizontally and 26 feet vertically.
(10)
Maximum permissible spans of planking shall be in conformity with paragraph (a)(9) of this section.
(11)
Drawings and specifications for all frame scaffolds over 125 feet in height above the base plates shall be designed by a registered professional engineer and copies made available to the employer and for inspection purposes.
(13)
Frames and accessories for scaffolds shall be maintained in good repair and every defect, unsafe condition, or noncompliance with this section shall be immediately corrected before further use of the scaffold. Any broken, bent, excessively rusted, altered, or otherwise structurally damaged frames or accessories shall not be used.
(14)
Periodic inspections shall be made of all welded frames and accessories, and any maintenance, including painting, or minor corrections authorized by the manufacturer, shall be made before further use.
(e) Outrigger scaffolds.
(1)
Outrigger beams shall extend not more than 6 feet beyond the face of the building. The inboard end of outrigger beams, measured from the fulcrum point to the extreme point of support, shall be not less than one and one-half times the outboard end in length. The beams shall rest on edge, the sides shall be plumb, and the edges shall be horizontal. The fulcrum point of the beam shall rest on a secure bearing at least 6 inches in each horizontal dimension. The beam shall be secured in place against movement and shall be securely braced at the fulcrum point against tipping.
(2)
The inboard ends of outrigger beams shall be securely supported either by means of struts bearing against sills in contact with the overhead beams or ceiling, or by means of tension members secured to the floor joists underfoot, or by both if necessary. The inboard ends of outrigger beams shall be secured against tipping and the entire supporting structure shall be securely braced in both directions to prevent any horizontal movement.
(3)
Unless outrigger scaffolds are designed by a licensed professional engineer, they shall be constructed and erected in accordance with table D-16. Outrigger scaffolds designed by a registered professional engineer shall be constructed and erected in accordance with such design. A copy of the detailed drawings and specifications showing the sizes and spacing of members shall be kept on the job.
(4)
Planking shall be laid tight and shall extend to within 3 inches of the building wall. Planking shall be nailed or bolted to outriggers.
(5)
Where there is danger of material falling from the scaffold, a wire mesh or other enclosure shall be provided between the guardrail and the toeboard.
(6)
Where additional working levels are required to be supported by the outrigger method, the plans and specifications of the outrigger and scaffolding structure shall be designed by a registered professional engineer.
(f) Masons' adjustable multiple-point suspension scaffolds.
(1)
The scaffold shall be capable of sustaining a working load of 50 pounds per square foot and shall not be loaded in excess of that figure.
(2)
The scaffold shall be provided with hoisting machines that meet the requirements of a nationally recognized testing laboratory. Refer to § 1910.7 for definition of nationally recognized testing laboratory.
| Light duty | Medium duty | |
|---|---|---|
| Maximum scaffold load | 25 p.s.f. | 50 p.s.f. |
| Outrigger size | 2×10 in | 3×10 in. |
| Maximum outrigger spacing | 10 ft 0 in | 6 ft 0 in. |
| Planking | 2×9 in | 2×9 in. |
| Guardrail | 2×4 in | 2×4 in. |
| Guardrail uprights | 2×4 in | 2×4 in. |
| Toeboards (minimum) | 4 in | 4 in. |
(3)
The platform shall be supported by wire ropes in conformity with paragraph (a)(22) of this section, suspended from overhead outrigger beams.
(4)
The scaffold outrigger beams shall consist of structural metal securely fastened or anchored to the frame or floor system of the building or structure.
(5)
Each outrigger beam shall be equivalent in strength to at least a standard 7-inch, 15.3-pound steel I-beam, be at least 15 feet long, and shall not project more than 6 feet 6 inches beyond the bearing point.
(6)
Where the overhang exceeds 6 feet 6 inches, outrigger beams shall be composed of stronger beams or multiple beams and be installed in accordance with approved designs and instructions.
(7)
If channel iron outrigger beams are used in place of I-beams, they shall be securely fastened together with the flanges turned out.
(11)
All parts of the scaffold such as bolts, nuts, fittings, clamps, wire rope, and outrigger beams and their fastenings, shall be maintained in sound and good working condition and shall be inspected before each installation and periodically thereafter.
(12)
The free end of the suspension wire ropes shall be equipped with proper size thimbles and be secured by splicing or other equivalent means. The running ends shall be securely attached to the hoisting drum and at least four turns of rope shall at all times remain on the drum.
(13)
Where a single outrigger beam is used, the steel shackles or clevises with which the wire ropes are attached to the outrigger beams shall be placed directly over the hoisting drums.
(14)
The scaffold platform shall be equivalent in strength to at least 2-inch planking. (For maximum planking spans see paragraph (a)(9) of this section.)
(15)
Guardrails not less than 2 × 4 inches or the equivalent and not less than 36 inches or more than 42 inches high, with a mid-rail, when required, of 1 × 4-inch lumber or equivalent, and toeboards, shall be installed at all open sides on all scaffolds more than 10 feet above the ground or floor. Toeboards shall be a minimum of 4 inches in height. Wire mesh shall be installed in accordance with paragraph (a)(17) of this section.
(16)
Overhead protection shall be provided on the scaffold, not more than 9 feet above the platform, consisting of 2-inch planking or material of equivalent strength laid tight, when men are at work on the scaffold and an overhead hazard exists.
(17)
Each scaffold shall be installed or relocated in accordance with designs and instructions, of a registered professional engineer, and supervised by a competent, designated person.
(g) Two-point suspension scaffolds (swinging scaffolds).
(1)
Two-point suspension scaffold platforms shall be not less than 20 inches no more than 36 inches wide overall. The platform shall be securely fastened to the hangers by U-bolts or by other equivalent means.
(2)
The hangers of two-point suspension scaffolds shall be made of wrought iron, mild steel, or other equivalent material having a cross-sectional area capable of sustaining four times the maximum intended load, and shall be designed with a support for guardrail, intermediate rail, and toeboard.
(3)
When hoisting machines are used on two-point suspension scaffolds, such machines shall be of a design tested and approved by a nationally recognized testing laboratory. Refer to § 1910.7 for definition of nationally recognized testing laboratory.
(4)
The roof irons or hooks shall be of wrought iron, mild steel, or other equivalent material of proper size and design, securely installed and anchored. Tie-backs of three-fourth inch manila rope or the equivalent shall serve as a secondary means of anchorage, installed at right angles to the face of the building whenever possible and secured to a structurally sound portion of the building.
(5)
Guardrails not less than 2 × 4 inches or the equivalent and not less than 36 inches or more than 42 inches high, with a mid-rail, when required, of 1- × 4-inch lumber or equivalent, and toeboards, shall be installed at all open sides on all scaffolds more than 10 feet above the ground or floor. Toeboards shall be a minimum of 4 inches in height. Wire mesh shall be installed in accordance with paragraph (a)(17) of this section.
(6)
Two-point suspension scaffolds shall be suspended by wire or fiber ropes. Wire and fiber ropes shall conform to paragraph (a)(22) of this section.
(7)
The blocks for fiber ropes shall be of standard 6-inch size, consisting of at least one double and one single block. The sheaves of all blocks shall fit the size of rope used.
(8)
All wire ropes, fiber ropes, slings, hangers, platforms, and other supporting parts shall be inspected before every installation. Periodic inspections shall be made while the scaffold is in use.
(9)
On suspension scaffolds designed for a working load of 500 pounds no more than two men shall be permitted to work at one time. On suspension scaffolds with a working load of 750 pounds, no more than three men shall be permitted to work at one time. Each workman shall be protected by a safety lifebelt attached to a lifeline. The lifeline shall be securely attached to substantial members of the structure (not scaffold), or to securely rigged lines, which will safely suspend the workman in case of a fall.