OSHA 1926 Subpart L App A

8/17/2019 OSHA 1926 Subpart L App A

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• Part Number: 1926

• Part Title: Safety and Health Regulations for Construction

• Subpart: L

• Subpart Title: Scaolds

• Standard

Number: 1926 Subpart L App A

• Title: Scaold Specications

• GPO Source: eC!R

"his Appendi# pro$ides non%andatory guidelines to assist e%ployers in co%plying &ith the re'uire%ents

subpart L of this part( An e%ployer %ay use these guidelines and tables as a starting point for designing

scaold syste%s( Ho&e$er) the guidelines do not pro$ide all the infor%ation necessary to build a co%pletsyste%) and the e%ployer is still responsible for designing and asse%bling these co%ponents in such a &

that the co%pleted syste% &ill %eet the re'uire%ents of 1926(*+1,a-( Scaold co%ponents &hich are no

selected and loaded in accordance &ith this Appendi#) and co%ponents for &hich no specic guidelines o

tables are gi$en in this Appendi# ,e(g() .oints) ties) co%ponents for &ood pole scaolds %ore than 6/ feet

height) co%ponents for hea$yduty horse scaolds) co%ponents %ade &ith other %aterials) and

co%ponents &ith other di%ensions) etc(- %ust be designed and constructed in accordance &ith the capac

re'uire%ents of 1926(*+1,a-) and loaded in accordance &ith 1926(*+1,d-,1-(

Index to Appendix A for Subpart L

1. General guidelines and tables.

2. Specific guidelines and tables.

(a) Pole scaffolds:

Single-pole wood pole scaffolds.

Independent wood pole scaffolds.

(b) Tube and coupler scaffolds.

(c) Fabricated frame scaffolds.

(d) Plasterers', decorators' and large area scaffolds.

(e) Bricklayers' square scaffolds.

(f) Horse scaffolds.

(g) Form scaffolds and carpenters' bracket scaffolds.

(h) Roof bracket scaffolds.

(i) Outrigger scaffolds (one level).

https://www.osha.gov/pls/oshaweb/owalink.query_links?src_doc_type=STANDARDS&src_unique_file=1926_SUBPART_L_APP_A&src_anchor_name=1926+Subpart+L+App+Ahttp://www.ecfr.gov/cgi-bin/text-idx?SID=65b279ee2e7530009034c1f152d451e5&tpl=/ecfrbrowse/Title29/29tab_02.tplhttp://www.ecfr.gov/cgi-bin/text-idx?SID=65b279ee2e7530009034c1f152d451e5&tpl=/ecfrbrowse/Title29/29tab_02.tplhttps://www.osha.gov/pls/oshaweb/owalink.query_links?src_doc_type=STANDARDS&src_unique_file=1926_SUBPART_L_APP_A&src_anchor_name=1926+Subpart+L+App+A


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(j) Pump jack scaffolds.

(k) Ladder jack scaffolds.

(l) Window jack scaffolds.

(m) Crawling boards (chicken ladders).

(n) Step, platform and trestle ladder scaffolds.

(o) Single-point adjustable suspension scaffolds.

(p) Two-point adjustable suspension scaffolds.

(q)(1) Stonesetters' multi-point adjustable suspension

scaffolds.

(q)(2) Masons' multi-point adjustable suspension scaffolds.

(r) Catenary scaffolds.

(s) Float (ship) scaffolds.

(t) Interior hung scaffolds.

(u) Needle beam scaffolds.

(v) Multi-level suspension scaffolds.

(w) Mobile scaffolds.

(x) Repair bracket scaffolds.

(y) Stilts.

(z) Tank builders' scaffolds.

1( 0eneral 0uidelines and "ables

,a- "he follo&ing tables) and the tables in art 2 Specic guidelines and tables) assu%e that all load

carrying ti%ber %e%bers ,e#cept plans- of the scaold are a %ini%u% of 1)+// lbf3in,2- ,stress grade-

construction grade lu%ber( All di%ensions are no%inal si4es as pro$ided in the A%erican Soft&ood Lu%be

Standards) dated 5anuary 19/) e#cept that) &here rough si4es are noted) only rough or undressed lu%be

the si4e specied &ill satisfy %ini%u% re'uire%ents(

,b- Solid sa&n &ood used as scaold plans shall be selected for such use follo&ing the grading rules

established by a recogni4ed lu%ber grading association or by an independent lu%ber grading inspection

agency( Such plans shall be identied by the grade sta%p of such association or agency( "he association

agency and the grading rules under &hich the &ood is graded shall be certied by the 7oard of Re$ie&)

A%erican Lu%ber Standard Co%%ittee) as set forth in the A%erican Soft&ood Lu%ber Standard of the 8(S

epart%ent of Co%%erce(

,i- Allo&able spans shall be deter%ined in co%pliance &ith the :ational esign Specication for ;ood

Construction published by the :ational !orest roducts Association< paragraph + of A:S= A1/(>19>>

ScaoldingSafety Re'uire%ents published by the A%erican :ational Standards =nstitute< or for 2 # 1/ inc

,no%inal- or 2 # 9 inch ,rough- solid sa&n &ood plans) as sho&n in the follo&ing table?

_______________________________________________

| |


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| the span and 250 pounds placed 18

| inches to the left and right of the

| center of the span (total 750 pounds).

________________________|___________________________________________

:ote? latfor% units used to %ae scaold platfor%s intended for lightduty use shall be capable of

supporting at least 2+ pounds per s'uare foot applied unifor%ly o$er the entire unitspan area) or a 2+/pound point load placed on the unit at the center of the span) &hiche$er load produces the greater shear

force(

,d- 0uardrails shall be as follo&s?

,i- "oprails shall be e'ui$alent in strength to 2 inch by * inch lu%ber< or

1 1/4 inch x 1/8 inch structural angle iron; or

1 inch x .070 inch wall steel tubing; or 1.990 inch x .058

inch wall aluminum tubing.

,ii- @idrails shall be e'ui$alent in strength to 1 inch by 6 inch lu%ber< or

1 1/4 inch x 1 1/4 inch x 1/8 inch structural angle iron; or

1 inch x .070 inch wall steel tubing; or

1.990 inch x .058 inch wall aluminum tubing.

,iii- "oeboards shall be e'ui$alent in strength to 1 inch by * inch lu%ber< or

1 1/4 inch x 1 1/4 inch structural angle iron; or



,i$- osts shall be e'ui$alent in strength to 2 inch by * inch lu%ber< or

1 1/4 inch x 1 1/4 inch x 1/8 structural angle iron; or



,$- istance bet&een posts shall not e#ceed > feet(

,e- $erhead protection shall consist of 2 inch no%inal planing laid tight) or B3*inch ply&ood(

,f- Screen installed bet&een toeboards and %idrails or toprails shall consist of :o( 1> gauge 8(S( Standard

&ire one inch %esh(

2( Specic guidelines and tables(

,a- ole Scaolds(


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| | | 3 x 4 in....| or 3 x 5 in.

8 feet...... |........... |........... |2 x 10 in. or|

| | | 3 x 4 in....|..........

| | | |

Planking..........|1 1/4 x 9 in|2 x 10 in.. |2 x 10 in....|2 x 10 in.

| | | |

Maximum vertical | | | |

spacing of | | | |

horizontal | | | |

members. |7 feet......|9 feet......|7 feet.......|6 ft. 6 in.

| | | |

Bracing | | | |

horizontal.... |1 x 4 in....|1 x 4 in....|1 x 6 in. or |2 x 4 in.

| | | 1 1/4 x 4 in|

| | | |

Bracing diagonal..|1 x 4 in....|1 x 4 in....|1 x 4 in.....|2 x 4 in.

| | | |

Tie-ins...........|1 x 4 in....|1 x 4 in....|1 x 4 in.....|1 x 4 in.

__________________|____________|____________|_____________|___________

:ote? All %e%bers e#cept planing are used on edge( All &ood bearers shall be reinforced &ith B316 # 2 in

steel strip) or the e'ui$alent) secured to the lo&er edges for the entire length of the bearer(

Independent Wood Pole Scaffolds

______________________________________________________________________

| | | |

| Light duty | Light duty | Medium duty | Heavy duty

| up to 20 | up to 60 | up to 60 | up to 60

| feet high | feet high | feet high | feet high

_________________|____________|____________|_____________|____________

| | | |

Maximum intended | | | |

load.......... |25 lbs/ft(2)|25 lbs/ft(2)|50 lbs/ft(2) |75 lbs/ft(2).

| | | |


7/16

Poles or uprights|2 x 4 in....|4 x 4 in....|4 x 4 in.....|4 x 4 in.

| | | |


spacing | | | |

(longitudinal). |6 feet......|10 feet.....|8 feet.......|6 feet.

| | | |

Maximum | | | |

(transverse).. |6 feet......|10 feet.....|8 feet.......|8 feet.

| | | |

Runners......... |1 1/4 x 4 in|1 1/4 x 9 in|2 x 10 in....|2 x 10 in.

| | | |

Bearers and | | | |

maximum spacing | | | |

of bearers: | | | |

| | | |

3 feet...... |2 x 4 in....|2 x 4 in....|2 x 10 in....|2 x 10 in.

| | | | (rough).

6 feet...... |2 x 6 in. or|2 x 10 in.. |2 x 10 in....|2 x 10 in.

| 3 x 4 in...| (rough) or | | (rough).

| | 3 x 8 in. | |

8 feet...... |2 x 6 in. or|2 x 10 in.. |2 x 10 in....|........

| 3 x 4 in...| (rough) or | |

| | 3 x 8 in. | |

10 feet..... |2 x 6 in. or|2 x 10 in.. | |

| 3 x 4 in...| (rough) or | |

| | 3 x 3 in.. |.............|........

| | | |

Planking........ |1 1/4 x 9 in|2 x 10 in...|2 x 10 in....|2 x 10 in.

| | | |

Maximum vertical | | | |

spacing of | | | |

horizontal | | | |

members. |7 feet......|7 feet......|6 feet.......|6 feet.

| | | |


9/16

| |or Nominal |

| |2 1/2 in. |

| |(2.375 in.). |

| |OD steel tube |

| |or pipe and a |

| |maximum post |

| |spacing of |

| |6 ft. x8 ft.(*)|

| | |

Maximum runner | | |

spacing | | |

vertically....... |6 ft. 6 in.. |6 ft. 6 in.....|6 ft. 6 in.

___________________|______________|_______________|______________

Footnote(*) Bearers shall be installed in the direction of the

shorter dimension.

:ote? Longitudinal diagonal bracing shall be installed at an angle of *+ deg( ,3 + deg(-(

Maximum Number of Planked Levels

_____________________________________________________________________

| |

| Maximum number of |

| additional planked levels | Maximum

|____________________________| height of

| Light | Medium | Heavy | scaffold

| duty | duty | duty | (in feet)

__________________________|_________|_________|________|_____________

| | | |

Number of Working Levels: | | | |

1..................... | 16 | 11 | 6 | 125

2..................... | 11 | 1 | 0 | 125

3..................... | 6 | 0 | 0 | 125

4..................... | 1 | 0 | 0 | 125

__________________________|_________|_________|________|_____________


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,c- D!abricated fra%e scaolds(D 7ecause of their prefabricated nature) no additional guidelines or tables f

these scaolds are being adopted in this Appendi#(

,d- DlasterersE) decoratorsE) and large area scaolds(D "he guidelines for pole scaolds or tube and couple

scaolds ,Appendi# A ,a- and ,b-- %ay be applied(

,e- D7riclayersE s'uare scaolds(D

@a#i%u% intended load? +/ lb3ft(,2-,F-

__________

Footnote(*) The squares shall be set not more than 8 feet apart for

light duty scaffolds and not more than 5 feet apart for medium duty

scaffolds.

Maximum width: 5 ft.

Maximum height: 5 ft.

Gussets: 1 x 6 in.

Braces: 1 x 8 in.

Legs: 2 x 6 in.

Bearers (horizontal members): 2 x 6 in.

,f- Horse scaolds(

@a#i%u% intended load ,light duty-? 2+ lb3ft(,2-,FF-

__________

Footnote(**) Horses shall be spaced not more than 8 feet apart for

light duty loads, and not more than 5 feet apart for medium duty

loads.

Maximum intended load (medium duty): 50 lb/ft.(2)(**)

__________

Footnote(**) Horses shall be spaced not more than 8 feet apart for

light duty loads, and not more than 5 feet apart for medium duty

loads.

Horizontal members or bearers:


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Light duty: 2 x 4 in.

Medium duty: 3 x 4 in.

Legs: 2 x 4 in.

Longitudinal brace between legs: 1 x 6 in.

Gusset brace at top of legs: 1 x 8 in.

Half diagonal braces: 2 x 4 in.

,g- D!or% scaolds and carpentersE bracet scaolds(D

,1- 7racets shall consist of a triangularshaped fra%e %ade of &ood &ith a crosssection not less than 2

inches by B inches) or of 1 13* inch # 1 13* inch # 13> inch structural angle iron(

,2- 7olts used to attach bracets to structures shall not be less than +3> inches in dia%eter(

,B- @a#i%u% bracet spacing shall be > feet on centers(

,*- :o %ore than t&o e%ployees shall occupy any gi$en > feet of a bracet or for% scaold at any one ti%

"ools and %aterials shall not e#ceed + pounds in addition to the occupancy(

,+- ;ooden gurefour scaolds?

Maximum intended load: 25 lb/ft.(2)

Uprights: 2 x 4 in. or 2 x 6 in.

Bearers (two): 1 x 6 in.

Braces: 1 x 6 in.

Maximum length of bearers (unsupported): 3 ft. 6 in.

,i- utrigger bearers shall consist of t&o pieces of 1 # 6 inch lu%ber nailed on opposite sides of the $ertic

support(

,ii- 7earers for &ood gurefour bracets shall pro.ect not %ore than B feet 6 inches fro% the outside of th

for% support) and shall be braced and secured to pre$ent tipping or turning( "he nee or angle brace sha

intersect the bearer at least B feet fro% the for% at an angle of appro#i%ately *+ degrees) and the lo&er

end shall be nailed to a $ertical support(

,6- @etal bracet scaolds?


Uprights: 2 x 4 inch

Bearers: As designed.

Braces: As designed.

(7) Wood bracket scaffolds:


12/16


Uprights: 2 x 4 in or 2 x 6 in

Bearers: 2 x 6 in

Maximum scaffold width: 3 ft 6 in

Braces: 1 x 6 in

,h- DRoof bracet scaolds(D :o specic guidelines or tables are gi$en(

,i- Dutrigger scaolds ,single le$el-(D :o specic guidelines tables are gi$en(

,.- Du%p .ac scaolds(D ;ood poles shall not e#ceed B/ feet in height( @a#i%u% intended load +// lbs

bet&een poles< applied at the center of the span( :ot %ore than t&o e%ployees shall be on a pu%p .ac

scaold at one ti%e bet&een any t&o supports( ;hen 2 # *Es are spliced together to %ae a * # * inch &o

pole) they shall be spliced &ith D1/ pennyD co%%on nails no %ore than 12 inches center to center)

staggered unifor%ly fro% the opposite outside edges(

,- DLadder .ac scaolds(D @a#i%u% intended load 2+ lb3ft,2-( Ho&e$er) not %ore than t&o e%ployeesshall occupy any platfor% at any one ti%e( @a#i%u% span bet&een supports shall be > feet(

,l- D;indo& .ac scaolds(D :ot %ore than one e%ployee shall occupy a &indo& .ac scaold at any one

ti%e(

,%- DCra&ling boards ,chicen ladders-(D Cra&ling boards shall be not less than 1/ inches &ide and 1 inch

thic) &ith cleats ha$ing a %ini%u% 1 # 1 132 inch crosssectional area( "he cleats shall be e'ual in length

the &idth of the board and spaced at e'ual inter$als not to e#ceed 2* inches(

,n- DStep) platfor%) and trestle ladder scaolds(D :o additional guidelines or tables are gi$en(

,o- DSinglepoint ad.ustable suspension scaolds(D @a#i%u% intended load 2+/ lbs( ;ood seats for

boats&ainsE chairs shall be not less than 1 inch thic if %ade of nonla%inated &ood) or +3> inches thic if

%ade of %arine 'uality ply&ood(

,p- D"&opoint ad.ustable suspension scaolds(D ,1- =n addition to direct connections to buildings ,e#cept

&indo& cleanersE anchors- acceptable &ays to pre$ent scaold s&ay include angulated roping and static

lines( Angulated roping is a syste% of platfor% suspension in &hich the upper &ire rope shea$es or

suspension points are closer to the plane of the building face than the corresponding attach%ent points o

the platfor%) thus causing the platfor% to press against the face of the building( Static lines are separate

ropes secured at their top and botto% ends closer to the plane of the building face than the outer%ost ed

of the platfor%( 7y dra&ing the static line taut) the platfor% is dra&n against the face of the building(

,2- n suspension scaolds designed for a &oring load of +// pounds) no %ore than t&o e%ployees sha

be per%itted on the scaold at one ti%e( n suspension scaolds &ith a &oring load of +/ pounds) no

%ore than three e%ployees shall be per%itted on the scaold at one ti%e(

,B- Laddertype platfor%s( "he side stringer shall be of clear straightgrained spruce( "he rungs shall be o

straightgrained oa) ash) or hicory) at least 1 13> inches in dia%eter) &ith 3> inch tenons %ortised into

the side stringers at least 3> inch( "he stringers shall be tied together &ith tie rods not less than 13* inch

dia%eter) passing through the stringers and ri$eted up tight against &ashers on both ends( "he Gooring

strips shall be spaced not %ore than +3> inch apart) e#cept at the side rails &here the space %ay be 1 inc

Laddertype platfor%s shall be constructed in accordance &ith the follo&ing table?

Schedule for Ladder-Type Platforms

_____________________________________________________________________


14/16

| or underside, full length.

Rungs......................|Rungs shall be 1 1/8 inch minimum

| diameter with at least 7/8 inch in

| diameter tenons, and the maximum

| spacing shall be 12 inches to center.

| Tie rods.

| |

Number (minimum)....... |5...................|6.

Diameter (minimum)..... |1/4 in..............|1/4 in.

Flooring, minimum finished | |

size..................... |1/2 x 2 3/4 in......|1/2 x 2 3/4 in.

___________________________|____________________|____________________

,*- lan"ype latfor%s( lantype platfor%s shall be co%posed of not less than no%inal 2 # > inch

unspliced plans) connected together on the underside &ith cleats at inter$als not e#ceeding * feet) start

6 inches fro% each end( A bar or other eecti$e %eans shall be securely fastened to the platfor% at each

end to pre$ent the platfor% fro% slipping o the hanger( "he span bet&een hangers for plantype platfor

shall not e#ceed 1/ feet(

,+- 7ea%"ype latfor%s( 7ea% platfor%s shall ha$e side stringers of lu%ber not less than 2 # 6 inches se

on edge( "he span bet&een hangers shall not e#ceed 12 feet &hen bea% platfor%s are used( "he Gooring

shall be supported on 2 # 6 inch cross bea%s) laid Gat and set into the upper edge of the stringers &ith a

snug t) at inter$als of not %ore than * feet) securely nailed to the cross bea%s( !loorboards shall not be

spaced %ore than 132 inch apart(

,'-,1- D@ultipoint ad.ustable suspension scaolds and stonesettersE %ultipoint ad.ustable suspension

scaolds(D :o specic guidelines or tables are gi$en for these scaolds(

,'-,2- D@asonsE %ultipoint ad.ustable suspension scaolds(D @a#i%u% intended load +/ lb3ft,2-( ach

outrigger bea% shall be at least a standard inch) 1+(B pound steel =bea%) at least 1+ feet long( Such

bea%s shall not pro.ect %ore than 6 feet 6 inches beyond the bearing point( ;here the o$erhang e#ceeds

feet 6 inches) outrigger bea%s shall be co%posed of stronger bea%s or %ultiple bea%s(

,r- DCatenary scaolds(D ,1- @a#i%u% intended load +// lbs(

,2- :ot %ore than t&o e%ployees shall be per%itted on the scaold at one ti%e(

,B- @a#i%u% capacity of co%ealong shall be 2)/// lbs(

,*- Iertical picups shall be spaced not %ore than +/ feet apart(

,+- Ropes shall be e'ui$alent in strength to at least 132 inch ,1(B c%- dia%eter i%pro$ed plo& steel &ire

rope(

,s- D!loat ,ship- scaolds(D ,1- @a#i%u% intended load +/ lbs(

,2- latfor%s shall be %ade of B3* inch ply&ood) e'ui$alent in rating to A%erican ly&ood Association 0ra

77) 0roup =) #terior(

,B- 7earers shall be %ade fro% 2 # * inch) or 1 # 1/ inch rough lu%ber( "hey shall be free of nots and oth

Ga&s(


15/16

,*- Ropes shall be e'ui$alent in strength to at least 1 inch ,2(+ c%- dia%eter rst grade %anila rope(

,t- =nterior hung scaolds(

Bearers (use on edge): 2 x 10 in.

Maximum intended load: Maximum span

25 lb/ft.(2): 10 ft.

50 lb/ft.(2): 10 ft.

75 lb/ft.(2): 7 ft.

(u) "Needle beam scaffolds."


Beams: 4 x 6 in.

Maximum platform span: 8 ft.

Maximum beam span: 10 ft.

,1- Ropes shall be attached to the needle bea%s by a scaold hitch or an eye splice( "he loose end of the

rope shall be tied by a bo&line not or by a round turn and a half hitch(

,2- Ropes shall be e'ui$alent in strength to at least 1 inch ,2(+ c%- dia%eter rst grade %anila rope(

,$- D@ultile$el suspension scaolds(D :o additional guidelines or tables are being gi$en for these scaold

,&- D@obile Scaolds(D Stability test as described in the A:S= A92 series docu%ents) as appropriate for the

type of scaold) can be used to establish stability for the purpose of 1926(*+2,&-,6-(

,#- DRepair bracet scaolds(D :o additional guidelines or tables are being gi$en for these scaolds(

,y- DStilts(D :o specic guidelines or tables are gi$en(

,4- D"an builderEs scaold(D

,1- "he %a#i%u% distance bet&een bracets to &hich scaolding and guardrail supports are attached sha

be no %ore than 1/ feet 6 inches(

,2- :ot %ore than three e%ployees shall occupy a 1/ feet 6 inch span of scaold planing at any ti%e(

,B- A taut &ire or synthetic rope supported on the scaold bracets shall be installed at the scaold plan

le$el bet&een the inner%ost edge of the scaold platfor% and the cur$ed plate structure of the tan shelser$e as a safety line in lieu of an inner guardrail asse%bly &here the space bet&een the scaold platfor%

and the tan e#ceeds 12 inches ,B/(*> c%-( =n the e$ent the open space on either side of the rope e#ceed

12 inches ,B/(*> c%-) a second &ire or synthetic rope appropriately placed) or guardrails in accordance &

J 1926(*+1,g-,*-) shall be installed in order to reduce that open space to less than 12 inches ,B/(*> c%-(

,*- Scaold plans of rough fulldi%ensioned 2inch ,+(1 c%- # 12inch ,B/(+ c%- ouglas !ir or Southern

Kello& ine of Select Structural 0rade shall be used( ouglas !ir plans shall ha$e a ber stress of at least

19// lb3in,2- ,1B/)929 n3c%,2-- and a %odulus of elasticity of at least 1)9//)/// lb3in,2- ,1B/)929)///

n3c%,2--) &hile Kello& ine plans shall ha$e a ber stress of at least 2+// lb3in,2- ,12)2+ n3c%,2-- and

%odulus of elasticity of at least 2)///)/// lb3in,2- ,1B)>2/)/// n3c%,2--(


16/16

,+- 0uardrails shall be constructed of a taut &ire or synthetic rope) and shall be supported by angle irons

attached to bracets &elded to the steel plates( "hese guardrails shall co%ply &ith Sec( 1926(*+1,g-,*-(

0uardrail supports shall be located at no greater than 1/ feet 6 inch inter$als(

61 !R *6/2+) Aug( B/) 1996< !R *69+/) Aug( ) 2/12M

Next Standard (1926 Subpart L App B)
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Documents

OSHA 1926 Subpart L App A