ACROWSKAF

General Technical and Application Manual

Boral Formwork & Scaffolding

ACROW CYCLONE
 2 ACROWSKAF Scaffolding System

ACROWSKAF – Functional design with simplicity of connection

The ACROWSKAF system has been designed and developed to meet the requirements of the
Australian construction and housing industries.
ACROWSKAF principal design features are:
• Speed of assembly
• Low maintenance required to keep in top working condition
• Versatility of application
• Simplicity of components and their connection
• Galvanised components improve corrosion resistance
• No special tools required for assembly (hammer and spirit level only).
ACOWSKAF – Easy to erect
Each component has its own built in connection to enable it to be joined to its mating component
in the system. With the exception of bolting the handrail to the Aluminium staircase no additional
loose parts are required to join components in the system.
ACROWSKAF – Versatile in use
It is suitable for access scaffold or support structure with an extensive range of special applications.
ACROWSKAF – Proven design with safety accessories
The ACROWSKAF system has a proven performance history on an extensive number of sites,
meeting the requirements of the various statutory bodies. A full range of accessories is available to
cater for safety requirements such as handrails, mesh panels, ladder access, staircase access and
components to provide overhead protection.
Important
The erection and application instructions contained in this book let are the recommended methods
to be used for ACROWSKAF products.The technical instructions contained in this brochure must
be accurately followed to achieve the correct function of the product. Seek advice from the BF&S
Engineering Department should you need to deviate from the recommendations and technical detail
given in this manual.
The safe use and application of the ACROWSKAF system must be in accordance with AS 1576, AS 4576,
Occupational Health & Safety Regulations, approved industry codes of practice and relevant regulatory authority
requirements. The illustrations in these assembly instructions are guidelines only.
Safety Warning
It is recommended that users of the ACROWSKAF system employ and implement appropriate procedures and
controls measures to eliminate or control any risk of Musculoskeletal disorder/injury while manually handling
ACROWSKAF components.
Refer to Code of Practice on manual handling published by local Workcover Authority or other approved and
recognised guidelines for correct and appropriate manual handling procedures.
Product Codes
The product codes shown on pages 3 to 8 are sales codes.
To determine the hire code, remove the letter Z.
Example: Sale code for ACROWSKAF Standard 3000mm is ZMS30.
Hire code for ACROWSKAF Standard 3000mm is MS30.
Availability
Boral Formwork and Scaffolding hire more than one type of scaffold system, however, some branches may only
carry one type. Please check the availability of the system carried by your local Boral Formwork & Scaffolding
outlet.
Characteristics of our systems are outlined in Boral Formwork & Scaffolding technical brochures.

Disclaimer
1 The photographs/illustrations shown within this brochure are intended as expressing the diversity and possible applications of the product and
as such must not be used as assembly instructions.
2 In line with Boral Formwork & Scaffolding’s commitment to continuous product development and improvement, the information contained in
this brochure may be changed without notice.
3 Every effort has been made to give appropriate guidelines for the use of this product, however, Boral Formwork & Scaffolding Pty Ltd accepts
no responsibility for any loss or damage suffered by any person acting or refraining from action as a result of this information.
Should the users require any further information or guidance, they are encouraged to contact their local Boral Formwork & Scaffolding outlet.
General Technical and Application Manual 3

Product Mass
Product Description
Code Kg

ACROWSKAF Standards
Standards are available in 5 basic sizes and
feature V-connector clusters welded at 495.3mm
279.4

intervals. The Standard features an external

sleeve at the top end of it containing a built-in
camlock locking device. The open ended design
495.3

allows the insertion of another Standard or an

Adjustable Base or Adjustable U-Head.
495.3

45°

89
3060.8
2971.8

495.3
495.3

Plan

CAMLOCK Sleeve Detail

495.3

ACROWSKAF Standard 1.0m ZMS10 6.7

ACROWSKAF Standard 1.5m ZMS15 9.5
215.9

ACROWSKAF Standard 2.0m ZMS20 12.2

ACROWSKAF Standard 2.5m ZMS25 15.0
ACROWSKAF Standard 3.0m ZMS30 17.8

100 ACROWSKAF Transoms

The Transom incorporates a fabricated T section
as the plank support member with a spigot,
wedge and saddle assembly welded at each end.
The spigot locates into the V-connector on the
Standard and the wedge locks it in place.
The 1.83m and the 2.44m Transoms have
additional web members welded below the
flange section for added strength (See page 9).

Wedge

Spigot
support
saddle
Spigot
pressing

Spigot Support Saddle and Wedge Assembly

ACROWSKAF Transom 0.76m ZMT07 4.9

ACROWSKAF Transom 0.81m ZMT762 5.2
ACROWSKAF Transom 1.27m ZMT12 7.9
ACROWSKAF Transom 1.83m ZMT18 13.8
ACROWSKAF Transom 2.44m ZMT24 19.2
 4 ACROWSKAF Scaffolding System

Product Mass
Product Description
Code Kg

ACROWSKAF Ledgers
The Ledgers are manufactured from 48.3mm
O.D. tube with spigot, wedge and saddle
assembly welded at each end. Ledgers are
available in various lengths to provide the
desired bay sizes for scaffolding.
ACROWSKAF Ledger 0.76m ZML07 3.5
ACROWSKAF Ledger 0.81m ZML08 3.7
ACROWSKAF Ledger 1.27m ZML12 5.3
ACROWSKAF Ledger 1.83m ZML18 7.4
ACROWSKAF Ledger 2.44m ZML24 9.6
ACROWSKAF Ledger 3.05m ZML30 11.7
gth
e len

Height
Brac

ACROWSKAF Diagonal Braces

Diagonal Braces are made from 48.3mm dia tube
with a swivel C section and wedge at each end
for connection to the V-cluster on the Standard.
Their function is to provide transverse and
longitudinal bracing to the scaffold structure.
ngth
Bay le The brace is available in various lengths to suit
the combination of bay widths and heights.
ACROWSKAF End Brace 1.67m ZMB167 6.5
ACROWSKAF End Brace 1.69m ZMB17 6.6
Bay Length ACROWSKAF End Brace 1.96m ZMB20 7.5
Brace Length (m)
x Height (m) ACROWSKAF Diagonal Brace 2.70m ZMB27 9.8
0.71 x 1.5 1.67 ACROWSKAF Diagonal Brace 3.14m ZMB32 11.2
ACROWSKAF Diagonal Brace 3.48m ZMB36 12.2
0.81 x 1.5 1.69
ACROWSKAF Diagonal Brace 3.64m ZMB364 15.6
1.27 x 1.5 1.96

1.83 x 2.0 2.7

2.44 x 2.0 3.14

2.44 x 2.5 3.48

3.05 x 2.0 3.64

ACROWSKAF Platform Brackets

1 Plank Platform Brackets attach to the scaffold Standard
and enable 1, 2 or 3 plank wide platforms to be
placed between the scaffold and the workface.
The spigot, wedge and saddle assembly end
2 Plank locates into the V-cluster on the Standard and
on the 2 or 3 plank wide brackets the ends of
the brackets are connected to each other by Tie
Bars. The 3 plank wide bracket has provision for
3 Plank a Guardrail post.
ACROWSKAF Platform Bracket – 1 Plank ZMHUB1 10.2
ACROWSKAF Platform Bracket – 2 Plank ZMHUB2 6.3
ACROWSKAF Platform Bracket – 3 Plank ZMHUB3 2.0
General Technical and Application Manual 5

Product Mass
Product Description
Code Kg

ACROWSKAF Tie Bars

Tie bars are used to interlock the ends of
platform brackets and to provide a means of
preventing the planks from sliding off the end of
the bracket. The studs at the end of the Tie Bar
locate into holes in the Platform Brackets.
ACROWSKAF Tie Bar 1.27m ZMTB13 3.6
ACROWSKAF Tie Bar 1.83m ZMTB18 5.1
ACROWSKAF Tie Bar 2.44m ZMTB24 6.7
ACROWSKAF Tie Bar 3.05m ZMTB305 10.8

ACROWSKAF Transom Beam

Transom Beams are designed for special duty
load applications. Allows high deck capacity and
large grid patterns.
ACROWSKAF Transom Beam 1.83m ZMTBEAM18 22.0
ACROWSKAF Transom Beam 2.44m ZMTBEAM24 32.0

ACROWSKAF Transom Truss

Transom Trusses are designed for high capacity
loading platforms and overhead protective
structures.
Connects at 4 points, enhancing the rigidity of
the scaffold.
ACROWSKAF Transom Truss 1.83m ZMTT18 40.1
ACROWSKAF Transom Truss 2.44m ZMTT24 55.5
ACROWSKAF Transom Truss 4.83m ZMTT30 111.0

ACROWSKAF Return Transom

The Return Transom is used at the end of a
scaffold run where it meets another scaffold
running at right angles to it.
The return flap of the Return Transom hooks
over the Ledger of the adjacent scaffold, closing
off the gap between the the two scaffolds.
ACROWSKAF Return Transom 1.3m ZMRT12 9.7

ACROWSKAF Ladder Access Putlog

The Ladder Access Putlog is used to provide
an opening in a bay allowing a ladder to pass
through it.
It spans between and is supported by the two
Ledgers and attaches to one of the Ledgers by
means of a J-bolt arrangement. It is available in
two sizes.
ACROWSKAF Ladder Access Putlog 1.27m ZMAP12 9.3
ACROWSKAF Ladder Access Putlog 1.83m ZMAP18 11.8
 6 ACROWSKAF Scaffolding System

Product Mass
Product Description
Code Kg

Adjustable Base
The Adjustable Base is a generic BF&S product
which is used with all scaffold systems and some
BF&S formwork systems.
It has a solid stem of 36mm nominal diameter
Adjustment range

which has a nut restraint to ensure the stem

448

always has a minimum engagement into the

Standard of 150 mm.
Adjustable Base (Solid) Form/Scaf ZABSFS 7.1

180 180

8mm plate

ACROWSKAF Catch Fan Transom

The Fan Transom is used to provide an angled
platform for protection against falling debris.
When used within the scaffold each end is
attached to opposing Standards. For external use
beyond the main scaffold the lower end connects
to a V-cluster on the Standard whilst the top end
is supported by the Fan Brace.
Consult BF&S Engineering Department for load
capacity details.
ACROWSKAF Catch Fan Transom ZMHO 8.5

ACROWSKAF Catch Fan Brace

Fan Brace is used to support the end of the Fan
Transom when it is used externally. The brace
connects to the V-cluster of a Standard and
the hook end connects into the end of the Fan
Transom.
ACROWSKAF Catch Fan Brace ZMOB 4.6

Mesh Panels
Mesh Panels are hung from the guardrail to
provide a full protection screen 1 metre high
along the length of the platform. The unit
incorporates a built in kick plate and typically
a midrail is not used when mesh guards are in
place. Available in the nominal bay lengths.
Mesh Panel 1.27m ZMP13 10.8
Mesh Panel 1.83m ZMP18 14.6
Mesh Panel 2.44m ZMP24 18.4
Mesh Panel 3.05m ZMP30 22.2
General Technical and Application Manual 7

Product Mass
Product Description
Code Kg

ACROWSKAF Steel Planks

Planks to suit ACROWSKAF are formed from
galvanised steel sheet with a perforated tread
to provide a non-skid surface. Perforations
are taken close to the ends and edges of the
plank to provide even coverage over the whole
assembled deck.
229 ACROWSKAF Steel Planks 1.27m Bay ZMSP13 8.7
ACROWSKAF Steel Planks 1.83m Bay ZMSP18 11.8
ACROWSKAF Steel Planks 2.44m Bay ZMSP24 15.8
61

ACROWSKAF Steel Planks 3.05m Bay ZMSP30 19.9

Typical Plank Section

ACROWSKAF Aluminium Stair

The Aluminium Stair enables a stairway to be
Holes to enable
attachment of assembled within a 2.44m x 1.27m ACROWSKAF
handrails bay. Each end of the Stair is supported by a
Transom. The width of the unit is half the bay
width enabling two units to sit on a Transom,
thus a continuous staircase can be built up the
full height of the scaffold. Vertical height of the
unit is 1.5m.
Aluminium Stair 1.5m rise ZCST15 26.0

Width 602mm

Aluminium Stair Handrail

The Stair Handrail follows the slope of the Stair
and is bolted to the inside face of the Stair side
member.
Aluminium Stair Handrail ZCPSTH 15.0

ACROWSKAF Exit Handrail

The Exit Handrail is typically attached to the
top Aluminium Stairway unit. It provides an
extension to the Stairway Handrail at the landing
level and is used to close off access through
the bay or the open space adjacent to the top
Stairway unit.
ACROWSKAF Exit Handrail ZMEHR 11.2
8 ACROWSKAF Scaffolding System

Product Mass
Product Description
Code Kg

ACROWSKAF Corner Panel - 2 Plank

The Corner Panel is designed to fill the gap left
where two runs of 2 Plank Platform Brackets
intersect on an internal corner of the building.
The unit attaches to the corner Standard and is
supported by the Platform Brackets.
ACROWSKAF Corner Panel – 2 Plank ZMCI 7.4

ACROWSKAF Stair Stringer

The Stair Stringer is a steel frame used in pairs in
conjunction with steel Planks to form a full width
access stair 1.27m wide. The Tie Member must
be attached across the centre of the Stringers to
maintain the correct spacing between Stringers
at centre span and act as a stability brace.
Stair Stringers are available in two sizes:
• 1m Rise x 1m Go - Used in
1.27m long x 1.27m wide bays.
• 2m Rise x 2.4m Go- Used in
2.44m long x 1.27m wide bays.
Note: Consult your local BFS Engineering department
for design advice if wider stairs are required.
ACROWSKAF Stair Stringer 1m rise x 1.27m go ZMSS112 12.5
Tie Member ACROWSKAF Stair Stringer 2m rise x 2.4m go ZMSS212 33.3
ACROWSKAF Stair Stringer Tie Member (1.3m) ZMTMSS 1.6

Toe Board Clamp

Toe boards are secured using the generic Toe
Board Clamp which locks around the Standard
with its protruding prong holding the toe board
plank or planks in place.
Toe Board Clamp ZTBC 0.8

ACROWSKAF Parallel Bracket

The Parallel Bracket is used to join two
Standards closely together for applications such
as constructing overhead hoarding support
structure.
ACROWSKAF Parallel Bracket ZMPB 1.1

SCAFFOLD Castor
The Scaffold Castor is designed to fit into the
bottom of a Standard. It features a swivel facility
and a dual function locking mechanism which
locks both swivel and rolling motion of the
Castor.
Scaffold Castor (200mm) ZCC200 4.5
General Technical and Application Manual 9

ACROWSKAF W
W
Transom P

L L

Working Load Limits

0.76 to 1.27m Transoms Duty Live Load to AS 1576.1
L (m)
W (kN)** P (kN)**
0.83 to 2.44m Transoms 0.76 Light (2.2kN UDL) 1.0
0.81 Light (2.2kN UDL) 1.0
Bottom web fin
1.27 Heavy (6.6kN UDL) 2.0
1.83 Medium (4.4kN UDL) 1.5
2.44 Medium (4.4kN UDL) 1.5

** Note:
• Loads W and P shown are not simultaneous loads. Refer AS1576.1, Clause 2.4.3.2.
• The Transom Working Load Limits shown in the table above are governed by the Operational requirements
of AS1576.1 Section 3. Typically, this limitation applies to working platform widths equal to
Transom size L shown.
• Where Special duty design is required or design loads exceed Duty Live Load shown then contact your local
BFS Engineering department for design advice.

ACROWSKAF Transom Beams and Transom Trusses

For special duty loading contact the BF&S Engineering Department

Transom Beam Transom Truss

Transom 1.83 & 2.44m 4.9m

Beam
Section

1.83m Section for 2.44m

all Trusses

P = Working Load Limit for point Load

W = Working Load Limit
for Uniformly Distributed Load
General Notes:
• Working Load Limits (P & W) may be limited by other components or assemblies.
• Minimum bearing length for point loads = 200mm.
• Reduction for self weight has not been considered in Working Load Limits above.
The designer must allow for the self weight.
10 ACROWSKAF Scaffolding System

ACROWSKAF Planks Plank Size (nom) Point Load Capacity

P L (m) P (kN)
229 1.27 4.3
1.83 2.9

62
2.44 2.2

• All planks meet point load requirement specified for

L Heavy Duty Loading to AS 1576.1
• The sum of individual loads applied to Planks must
not exceed the Duty Live Load for the platform
per bay.

ACROWSKAF Diagonal Braces P Shear Capacity

Of V-Connectors

P = ± 2.6 kN
For all standard sizes
P = 15 kN
ACROWSKAF Platform Brackets
P = 2.0 kN P = 2.0 kN P = 2.0 kN

1 Plank

2 Plank 3 Plank

ACROWSKAF Aluminium Stair Unit ACROWSKAF Stair Stringer (used in pairs)

2.44m

W = 2.5 kPa W = 2.5 kN/m

2

Total = 3.6 kN Total = 7.7 kN

2.0m nom.

W
1.5m nom.

0.6m 1.27m
W

Stair Tread Width

P = Working Load Limit for point Load

W = Working Load Limit for Uniformly Distributed Load
General Notes:
• Working Load Limits (P & W) may be limited by other components or assemblies.
• Minimum bearing length for point loads = 200mm.
• Reduction for self weight has not been considered in Working Load Limits above.
The designer must allow for the self weight.
General Technical and Application Manual 11

ACROWSKAF Assembly Recommendations

The following scaffold Assembly Recommendations will give you the foundation principles to assemble a basic
scaffold structure. Through experience with the system, different and more complex configurations can be
assembled.
For assistance with these recommendations contact your local Boral Formwork & Scaffolding Branch.
Persons erecting or dismantling the components should be competent in this type of work.
For safety reasons, we recommend that no less than two erectors work as a team to erect ACROWSKAF.
Notes:
• Where assistance is required in erecting more complex designs other than Standard façade type independent
scaffolding and configurations not shown in these recommendations, contact your local Boral Formwork &
Scaffolding representative.
• In certain areas scaffolding may be exposed to high winds and as such special precautions regarding tying
in and cladding applications can apply. For assistance with design of scaffolding that needs to be enclosed by
cladding contact your local Boral Formwork & Scaffolding Engineering office.
• In some cases, particular configurations of scaffolds and particular sites may require scaffolders to use safety
harnesses and lanyard systems to provide protection against a fall when erecting the scaffold over a void
or lean out from the scaffold or supporting structure without the protection of a guardrail. In such cases do
not attached harness systems to scaffolding supplied by Boral Formwork & Scaffolding unless approved by
Boral Formwork & Scaffolding Engineers.
Compliance to Statutory Regulations
Scaffolding must be erected in compliance with the requirements of Statutory Regulations and Australian
Standards for Scaffolding (AS/NZS1576 “Scaffolding” and AS/NZS 4576 “Guidelines for Scaffolding”) as
applicable.
In addition, below are some specific areas for your attention:
Erection of scaffolding over 4 metres in height:
Personnel who erect, alter or dismantle scaffolding over 4m in height must hold a current National, State or
Territory Certificate in Scaffolding to the appropriate class.
Risk Management:
When planning the erection of any scaffolding, a site specific Risk Assessment process must be carried out.
Generic Hazard Identification/Risk Assessments/Control methods profiles and Safe Work Methods Statements for
the erection, dismantling and the usage of scaffolding equipment are available from BF&S Branches. Site specific
Hazard Identification and Risk assessments and Safe Work Methods Statements would need to be generated for
specific projects.
Manual Handling:
As part of the risk management processes we draw your attention the requirement that scaffolders must, as
part of their competency, be competent in manual lifting techniques. Therefore, Scaffolders erecting, altering
or dismantling scaffolding must follow the manual handling guidelines published by Regulatory Authorities or
other guidelines and codes of practice recognised as being acceptable by such Regulatory authorities.

Tap,
don’t
hammer

Seated
firmly
12 ACROWSKAF Scaffolding System

1 Before commencing the erection of any ACROWSKAF scaffold, care

should be taken to see that the ground is suitable and clear of loose
rubble to provide a stable base and clear access for erection. Where the
ground is soft or made up, it should be consolidated and the scaffold
should be erected on adequate timber soleplates. As a general rule,
each soleplate should be long enough so that it supports at least two
Standards. Bricks or masonry blocks are not suitable and should not be
used.

2 Commence erection - where possible - on the highest point of the

ground and work down the incline - this will make levelling easier
as the scaffolding progresses horizontally.

Start here at top

3 Check whether or not Platform Brackets are required adjacent to the
workface. If so, you will need to make allowance for the width of the
Platform Brackets and increase the distance between the workface and
the closest Standard.

4 Set the nut of the Adjustable Base near (not

at) the bottom of the threaded stem to allow
maximum adjustment as the scaffold progresses
to lower ground levels.

5 Lay out the Ledgers and Transoms for the first

bay in the approximate positions. Then insert
an Adjustable Base into each of the first pair of
Standards.

6 At the starting point, place a 2m and

a 3m Standard onto Adjustable Bases
which have been approximately
levelled.

7 Form the first frame by joining the Standards with

a Transom attached to the lowest vee connector on
the lowest cluster. Position the frame so that the
2m Standard is closest to the workface and the 3m
Standard away from it. Ensure that the camlock
sleeve is at the top of the Standard. The Transom
should be connected to the lowest V-Connector
in the cluster, this ensures that the Ledgers when
Transom connected to connected will be in the correct position for fixing
lowest V-Connector
in cluster Ladder Access Putlogs etc.
Ensure that components are seated properly.
Do not tighten the wedges - yet.
General Technical and Application Manual 13

8 With one erector still holding the first frame square to the workface, the second erector inserts an Adjustable
Base into a 2m Standard and connects it to the frame with a Ledger at the Standard that is closest to the
workface. This Ledger should now be positioned adjacent to the workface and attached to the upper vee
connector in the cluster. The structure is now self supporting and the second erector completes the rectangle
with a further Transom, Ledger and 3m Standard.
Always maintain the sequence of a 3 metre Standard on the outside face and a 2 metre Standard on the
inside for the base of the scaffold.
Do not tighten the wedges - yet.

9 The bay can now be levelled. Starting from the highest

point use a spirit level to adjust the bases so that Ledgers
and Transoms are level. Accuracy in levelling at this stage
makes for a good start.
Do not tighten the wedges - yet.

10 Place ACROWSKAF Planks on Transoms at the base level

and complete the first lift of ACROWSKAF with Transoms
and Ledgers at the desired platform height (not more than
2m above the base members). Transoms and Ledgers
above the base level must also be located at the same
level.

11 The bay should now be squared in plan and correctly

located in relation to the structure being scaffolded.
Check squareness across the diagonally opposite
Standards. Checking squareness is assisted by placing the
recommended number of Planks between Transoms and
ensuring that Planks sit correctly with an even gap between
the ends of the Planks and the supporting Transom.
Fix a Diagonal Brace to the outer face and end face of the
first bay. Always start by fixing the Brace to the upper
cluster first, this makes for safer handling.
Wedges can now be tightened in this first bay.
Tap home the wedge.
No need for heavy hammering.
14 ACROWSKAF Scaffolding System

12 Now complete the base layout by adding bays horizontally, levelling and positioning each bay as you go
before tightening wedges. Continue the 2m and 3m Standard combination for the full run.
Once the base lift has been completely levelled for the length of the scaffold, your spirit level should no
longer be required.
Note:
Erection & dismantling of scaffold bays should be carried out from a fully decked platform or a platform of at
least two planks wide. Refer to local statutory regulations.

13 Planks are now moved up to fully deck out the the first lift.
When these Planks remain in place as a working platform, Ledgers are positioned at 0.5m and 1m above the
planked level to form a guardrail and midrail. For working platforms, toeboards on the outer face are also
required. A Mesh Panel which is 1m high incorporates a toeboard and can be used in lieu of a midrail and
toeboard. Mesh Panels are supported from the guardrail.

14 Additional lifts can now be constructed simply by adding further Standards into sockets of the Standards
of the lower lift and staggering joints wherever possible. Check that the vee connectors in the cluster on
the upper Standard and camlock sleeve are in the same orientation as the lower Standard and engage the
camlock sleeve. Transoms and Ledgers are placed at platform levels.
Working levels should be fully decked out and fitted with guardrails, midrails and toeboards (or Mesh Panels)
at the required positions.
Fully complete the longitudinal erection of a lift before progressing to the next lift.

Stagger joints in Standards wherever possible.

If 2.0m Standards were used on the inside face of the
first lift and 3.0m Standards on the outside face of the
first lift and each successive lift uses Standards of the
same height ie: inside and outside both 3.0m or both
2.5m or 2.0m then the initial stagger of the joints will
remain through the height of the scaffold.
General Technical and Application Manual 15

15 Face Bracing
All scaffolds require a certain amount of diagonal face bracing to eliminate any tendency for the scaffold to
distort or sway.
Before the scaffold goes beyond the second lift, Bracing should be added to the outside face and on the ends.
Braces attach to the outward facing Vee cluster on the Standard.
Further bracing must be placed on the scaffold as it progresses in length and height. Braces should span from
lift level to lift level and cross over joints in Standards and be positioned all the way to the top of the scaffold.

1.98m max
Lift Height
Typical

Typical “Zig Zag”

Longitudinal Bracing 3 Bays max Transverse Bracing
along external face Unbraced at ends

Alternative “Node to Node” type

Longitudinal Bracing pattern
along external face

Diagonal Braces provide stability to the scaffold and are used to brace adjacent Standards longitudinally or
transversely.
Face Diagonal Braces are positioned in the end bays of a scaffold run on the external face of the scaffold.
They extend from the first Vee cluster near ground level to the top working level. They are typically arranged
in an alternating (zig-zag) manner to provide more stability to the scaffold. For scaffold runs exceeding 5 bays
in length, intermediate bracing is required where a maximum of 3 bays can be left unbraced. Variations to
this spacing must be checked by the appropriate designer and specified in the design layout.
End Diagonal Braces are used between end pair of Standards in the transverse direction. They extend from
the first Vee cluster near ground level to the top working level in an alternating manner.
16 ACROWSKAF Scaffolding System

16 Ties
It is essential that scaffolds be tied to the building or suitable structure to prevent inwards or outwards
movement of the scaffold. As such they provide stability and enable effective performance of the scaffold
structure as it grows in height and length.
As a general rule, ties need to commence where the scaffold height exceeds 3 times its least width.
Typically ties comprise scaffold tube and right angle scaffold couplers and are connected to the Standards
with right angled scaffold couplers.
Care must be taken that ties do not obstruct clear access along the full length of the working and access
platforms.
The scaffold must not be built to allow it to cantilever more than 4m beyond the last level of ties. (See
diagram).
Below are examples showing some types of tie configurations eg. around columns and through openings.

Column Column Column

Double Lip or U Tie - PLAN Box Tie - PLAN Column Tie With Butt Transom - PLAN

Tie tubes Note: Through ties should be

Where it is not possible to use placed as close as possible
to the window reveal and
the typical tie configurations, secured with Right Angle
Couplers.
other tie methods incorporating
drilled in friction and “cast-in”
type anchors are available. These
methods have certain restrictions
for use so contact your local Boral
Formwork & Scaffolding Engineering
Representative for assistance.

Warning:
Tie tubes must not be attached to Ledgers. Tie tubes must be attached directly to Standards, if this is not
possible, then the scaffold tube must be fixed between Standards with Right Angled Couplers and the tie tube
is attached to this scaffold tube.
Tie Configuration
The diagram below shows an example of staggered tie configuration for scaffolding assembled with 2m lifts
and without any cladding, such as shade cloth or other semi or non porous material. Ties are installed at no
more than 3 bays apart for a maximum bay length of 2.44m in the longitudinal direction and 2 bays apart for
bay lengths of 3.05m. Ties should have a 4m overlap in the vertical direction. Cladding the scaffold will cause
wind loads to increase and tie spacings may need to reduce accordingly. Contact your local Boral Formwork
& Scaffolding Engineering Representative for assistance with tie spacing for clad scaffolds.

4m max beyond
last tied level

4m max
between
staggered ties
4m max
2m max beyond tie level
Lift height typical Height of first

1 Bay max Between ties Staggered Tie Points Staggered Tie Points
At Ends With No Return 3 Bays max (7.2m) Note: When using 3.05m ledgers
Between Ties the max distance between tiers is 2 Bays
or from a tied return
General Technical and Application Manual 17

Tying to Standards
Ties tubes must be connected to Standards and be parallel to Transoms at a position adjacent to the junction
of the Transom and Ledgers, with the following restrictions:
a) Within 300mm from the underside of the cluster at the junction - Connected to the front Standard with the
addition of check couplers.
b) Further than 300mm from underside of the cluster at the junction - Tie connected to both front & rear
Standards.
c) If unable to connect to two Standards then reinforce front Standard for the full height of the lift with
scaffold tube and Swivel Couplers with couplers attached at 900mm centres.
Note:
The 300mm distance given in (a), (b) & (c) may need to be reduced, subject to the amount of tie force.

More than More than

300mm 300mm

Within
300mm Connect to Reinforced tied
both Standards Standard

(a) (b) (c)

Increased distance between tie points

In cases where ties cannot be placed in the correct position, where ties have to be removed, where tie spacings
exceed those given in these assembly recommendations or in scaffolds which extend above the building, with
the result that typical tie spacings given in these Assembly Recommendations cannot be achieved, then consult
your local Boral Formwork & Scaffolding Engineering Representative for technical design assistance with tie
spacing and configurations to suit your specific needs.
Maximum Height of Scaffold
When determining the maximum height of a scaffold, a number of factors must be considered.
• Live load of working platforms (ie: Heavy Duty, Medium Duty or Light Duty).
• Number of working platforms.
• Live load of platform brackets.
• Dead load of scaffold (eg Standards, Transoms, Ledgers, guardrails, mesh guards, platform brackets,
planks, bracing, shadecloth and chainwire mesh).
• The position of the top tie in relation to the top of the scaffold.
• Wind Loading (in relation to tie forces).
• Strength of the supporting structure for the scaffold.
Scaffolding configurations can vary greatly, so for an ACROWSKAF scaffold of typically 1.27m wide, constructed
using 2m lifts, braced and tied in accordance with patterns given in these recommendations, without cladding,
with a maximum of two Heavy duty working platform levels (6.6kN as per AS 4576 and AS1576.1), two levels
of planks and platform brackets, guardrails at the outside face at 1m vertical spacing for full height of scaffold,
diagonal bracing for full height, the maximum heights of the scaffold are as follows:
• For scaffold constructed with bay lengths of 2.44m or less, maximum height = 45m
• For scaffold constructed with bay lengths of 3.05m, maximum height = 34m
Note:
Any additional equipment such as additional planked levels, working platforms, platform brackets, spurs
or the like will increase leg load and hence reduce the maximum height of the scaffold. Therefore, where
assessment shows that scaffold configuration exceeds the above conditions, consult your local Boral
Formwork & Scaffolding Engineering Representative for technical design assistance with the maximum
heights of ACROWSKAF and tying configurations to suit your specific needs.
18 ACROWSKAF Scaffolding System

17 Access and Egress Methods

Every working platform level must be provided with safe and suitable access. This can be achieved by means
of a built-in ladder or stair access tower or by direct access from within the building or structure. Stair access
can be constructed with either Aluminium Stairway units or steel Stair Stringers as outlined on pages 19
and 21.
(i) Ladder Access
Ladder access is typically used where only a few persons need access to the working platform and where
tools and equipment can be delivered separately to the working platform (such as by rope and gin wheel,
materials hoist or crane).
Ladder access bays can be constructed within the main run of the scaffold, however, where space permits it is
preferable that a separate ladder access bay be placed adjacent to the main run.
Single ladders need to extend at least 0.9m above the landing level, secured at the top and base and
successive landing levels should be vertically spaced at no more that 6m.
ACROWSKAF Ladder Access Putlogs are used to enable the formation of an opening within the deck through
which the ladder can pass. These Putlogs span between Ledgers and are typically positioned at mid-span of
the Ledgers or at the appropriate position to support two shorter length Planks. The remaining bay width is
decked out with Planks that span between Transoms in the usual manner.
Important:
Ensure that guarding and edge protection is installed around openings in Ladder Access Bays that are in or
beside working platforms.

Ladders inclined at slope of

between 4 to 1 and 6 to 1
and fixed to Ledger/Transom

Standard 2.44m 3.2m Braces

Ladders alternating 1.3m Planks x 2

each side of bay (Putlog to Transom)
Install guarding End Braces
& edge protection
1.27m

around opening

1.27m Transoms
& Ledgers
1.27m 2.4m Planks x 3 0.9m
2.4m Ledgers (Transom to Transom) min.
Ladder Access Putlog
secured between Ledgers
Tie Ladder
LADDER ACCESS BAY Access Bay
at Standards
PLAN VIEW every 4m max.

Denotes Transom positions

6m
max.

4m
max.

1270 2440

END VIEW ELEVATION

LADDER ACCESS BAY

ELEVATION
General Technical and Application Manual 19

(ii) ACROWSKAF Stair Access Systems

Two types of stair access systems are available within ACROWSKAF:
• Aluminium Stair System
• ACROWSKAF Stair Stringer System
(a) Aluminium Stair System
Aluminium Stair units fit within the Standard 1.27m x 2.44m bay. Each Stair unit is 0.6m wide and rises 1.5m
over the bay length of 2.44m and incorporates a landing at the top and base of the unit.
A 1.27m x 2.44m bay needs to be dedicated as the stair access bay. This bay can either be incorporated within
the main run of scaffold or adjacent to the run. The stair access bay typically shares common Standards with
the main run, however this detail needs to be checked during the scaffold design phase as height conditions
and wind loading can vary from site to site.
Commence the first lift by assembling 2.44m Ledgers and 1.27m Transoms at 1.5m vertical intervals, except
at entrance and exit points to the stairway where head clearance of 2m (nom) is required.
Lift the first Stair unit into place such that it is supported between the Transoms spaced at 1.5m vertical
intervals and position the Stair unit adjacent to the Standard. Note that stairway landings need to be adjacent
access/egress landing points at working platforms.
Install Ledgers at 0.5m and 1.0m above the landing level in both transverse and longitudinal directions to act
as midrails and guardrails respectively. Ledgers can be installed at 0.5m intervals on the exposed faces of the
bay for the full height of the bay.
Assemble the next lift of Standards Ledgers and Transoms and install the second Stair unit such that its
bottom landing commences from the Transom that supports the top landing of the lower Stair unit. A zigzag
pattern of stairs should now be established.
Where it is necessary to construct a stair access as a bay independent of the scaffold, then, ensure that the
stair access bay is adequately braced and tied to the main scaffold or other support structure. Tying and
bracing need to commence at completion of the first lift.
Subject to space required to handle the Stair units within the bay during installation, the Stair Handrails are
to be installed at the earliest opportunity. The Handrails bolt to the stair unit with M12 x 50 long bolts and
‘nyloc’ nuts. The Handrail should be bolted through the holes provided to the inside face of the stringer part
of the stairway. Holes are located towards the top and bottom of the Stair unit.
This zigzag pattern of Stair units is maintained until the desired height is achieved.
Once the uppermost Stair unit is installed, an Exit Handrail will need to be installed. Since the uppermost
Stair occupies only half the Transom width, the Exit Handrail is needed to block off access to the remaining
unoccupied width of the of the bay. Where appropriate, planks can be installed to occupy the remaining width
of Transom.
Note:
• Edge protection (guardrails, midrails and toeboards) is required at access and egress points of working
platforms.
• Care is to be taken to ensure that head clearance of 2m (nom) is maintained at these points.
• Gaps between the stair access landing and working platform levels may occur and these should be kept
to a minimum. Suitable infill should be installed.
20 ACROWSKAF Scaffolding System

Aluminium Stairway Access Bay

Exit Handrail

2m
Lift
Access/Egress
Point

Stair Handrail

Tie Stair bay

at Standards
every 4m max

4m
max.

1.5m
Rise/Lifts
Access/Egress
Point

1270 2440

Denotes Transom positions Aluminium Stair Access Bay

Elevation

0.6m
2.44m Ledgers
as external guardrails Access/Egress Point

Tie Stair bay

at Standards
every 4m max

Standards Aluminium Stair Units

Supported on Transoms
1.27m Transoms &
Ledgers as guardrails 1.27m
@ 1.5m lifts
Exit Handrail
(bolts to staircase &
swing gate attaches
to Standard)

2.4m Ledgers 2.44m

3.2m Braces Stair Handrail
Bolted to stairs

Aluminium Stair Access Bay

Plan View
General Technical and Application Manual 21

(b) ACROWSKAF Stair Stringers

ACROWSKAF Stair Stringers are available to suit two bay lengths, 2.44m and 1.27m. The vertical rise of
the stairs is dictated by the bay lengths to maintain the correct tread spacing (2.0m rise for 2.4m bay and
1.0m rise for the 1.27m bay).
The lower end of the stringer sits on a Ledger whilst the upper end rests clamps to the Standard.
Landings for the stair access are constructed with 1.27m square bays at each end of the Stringers.
ACROWSKAF 1.27m planks are used for the treads and are held captive on the stringer with an R-clip.
Alternatively, timber planks can be used, however these need to be bolted through the tread
support plate on the Stringer. Standard face braces 2.44m x 2.0m are used as handrails and midrails.
Typically, a 12 Standard configuration is used to assemble the stairway giving nominal overall plan
dimensions of 2.54m x 4.98m. This bay can either be incorporated within the main run of scaffold or
adjacent to the run. The stair access bay typically shares common Standards with the main run, however
this detail needs to be checked during the scaffold design phase as height conditions and wind loading
can vary from site to site.
Note:
• Edge protection (guardrails, midrails and toeboards) is required at access and egress points of
working platforms.
• Care is to be taken to ensure that head clearance of 2m (nom) is maintained at these points.
• Gaps between the stair access landing and working platform levels may occur and these should be kept
to a minimum, suitable infill should be installed.

Face Braces
as handrails

Ledgers

Acrowskaf Stair Stringer

clamped to Standard

Acrowskaf Standards
Acrowskaf Steel Plank

Acrowskaf Stair Stringer

Acrowskaf Stair Stringer

Tie Bar

Transom

1.27m Transoms at 2m lifts 1.27m Planks 2.4m Ledgers at 2m lifts 2.0m Stair Stringers
(Landings) & 1.27m Ledgers for stair treads (Top & bottom of Stringers) (2 per bay lift - clamped
at 0.5m & 1.0m above Landings secure to stringers to Standard at top &
for Midrails & Guardrails supported by Ledger at bottom)

1.27m Ledgers at 2m lifts 1.27m

(Landings) & 1.27m Ledgers
at 0.5m & 1.0m above Landings
for Midrails & Guardrails

1.27m Planks at Landings 1.27m

Standards Typical Entrance to stairs

1.27m 2.44m 1.27m
(Typical)
3.2m Braces as Handrails
(2 per stringer)

STAIR STRINGER BAY

(12 Standard configuration)
PLAN VIEW
22 ACROWSKAF Scaffolding System

Platform ('Hop Up') Brackets

Platform brackets (previously known as Hop Up brackets) are used to enable a platform to be placed between
the scaffold and the building or structure and are therefore attached to the Standard closest to that workface.
Widths vary from one to three planks wide. Platform Brackets are usually installed such that they provide a
platform at the same level as the work platform or 0.5mm below the work platform.
When installing Platform Brackets, make sure that they are interconnected with a Tie Bar and that the open
side of the Tie Bar angle faces inwards, enabling the steel plank to sit in the angle. This prevents accidental
dislodgment of the Tie Bar.
Corner Panels are also available to enable continuity of 2 Plank Platform Brackets around the internal corners
of buildings. These panels sit on two adjacent Platform Brackets and clamp to the Standard via the half
coupler.

ACROWSCKAF Plank Arrangement

1 Plank
Platform Bracket

2.44m Bay 0.81m Bay

10 planks plus toe board 3 planks plus toe board
plus Platform Bkt planks

2 Plank 3 Plank
Platform Bracket Platform Bracket

1.83m Bay 1.27m Bay

7 planks plus toe board 5 planks plus toe board
plus Platform Bkt planks plus Platform Bkt planks

19 Dismantling
Care must be taken when dismantling scaffold as the stability of the scaffold must be maintained at all times.
After removal of materials and equipment from the working platforms, dismantle the scaffolding generally in
the reverse order of the erection sequence.
Removal of ties to the permanent structure should progress at the same rate as the dismantling process. Do
not remove ties until dismantling of the scaffold reaches the level of the ties.
Do not remove diagonal braces until it is necessary to remove the Standard that it is attached to.
Ledgers should not be removed from any working level before the removal of scaffold planks from the same
level.
Localised overloading by stacking of dismantled equipment on partially dismantled scaffold must be avoided.
General Technical and Application Manual 23

20 Scaffold Safety Rules

The following are some common sense rules designed to promote safety in the use of scaffolding. These
rules do not purport to be all inclusive or to supplant or replace other additional safety and precautionary
measures. They are not intended to conflict with or supersede the requirements of statutory or government
regulations; reference to such specific authorities should be made by the user.
• Inspect all equipment before using. Never use any equipment that is damaged or deteriorated in any
way. If in doubt contact your supplier.
• Inspect erected scaffolds regularly to ensure that they are maintained in a safe condition.
• Consult Boral Formwork & Scaffolding when in doubt. Don’t take chances.
• Always check foundations and use adequate soleplates, especially on soft ground.
• Use Adjustable Bases instead of packing to adjust uneven grade conditions.
• When scaffolds are to be partially or fully enclosed, specific precautions must be taken to check the
frequency and adequacy of ties attaching to the building due to increased load conditions resulting from
effects of wind and rain. The scaffolding components to which the ties are attached must also be
checked for additional loads. Consult your Boral Formwork & Scaffolding Engineering Representative.
• Equip all planked or working levels with proper guardrails, midrails and toeboards along all open sides
and ends of scaffold platforms.
• Power lines near scaffolds are dangerous - use caution and consult the power authorities for advice and
local requirements.
• Do not use ladders or makeshift devices on top of scaffolds to increase the height.
• Do not overload scaffolds.
• Planking
(a) Use ACROWSKAF Steel Planks wherever possible.
(b) Timber scaffold planks may be used if intermediate putlogs are attached to ACROWSKAF Ledgers on
either side of the Standards to provide adequate support within plank span limit requirements.
Timber planks must not be supported only on ACROWSKAF Transoms.
• Adjustable Bases when fully extended shall have a minimum engagement of 150mm length of the spindle
remaining inside the Standard tube. In any case, the maximum extension from the baseplate to the
bottom of the Standard shall not exceed 450mm.
• Connections between components should be firmly secured.
• All scaffolding and accessories shall be installed in accordance with the recommendations of Boral
Formwork & Scaffolding Pty Ltd.
• Important! Always ensure that any joints in standards are below the last transom position. Under no
circumstances are guardrails to be attached to a standard cantilevering from a joint above the platform
level.
• When a scaffold has been completely erected it must be fully inspected by a qualified Scaffolder and a
Handover Certificate issued to the user verifying the scaffold is complete and safe to use. See your local
Boral Formwork & Scaffolding Branch for further details.
Note:
• The term ENGINEER referred to herein is in accordance with the definition of a person qualified for
corporate membership of the Institute of Engineers, Australia, and with experience in the area of
Scaffolding.
• The term COMPETENT PERSON referred to herein refers to a person who has been adequately trained,
has a number of years practical experience in the Scaffolding construction industry and is capable of
interpreting and applying the design requirements as specified in the Scaffolding documentation.

ALTERATION OF AN EXISTING SCAFFOLD BY UNQUALIFIED PEOPLE IS A SAFETY HAZARD

AND MUST NOT BE UNDERTAKEN
Boral Formwork & Scaffolding
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Broch 013 Jan 04

File No. 00804