2.1 Designing for Green Star and Building Code Compliance
Minimum energy efficiency standards for commercial buildings
are mandatory in the Building Code of Australia (BCA) and
National Construction Code of Australia (NCC). Thermal
insulation plays a key role in meeting these requirements and
improvements in insulation also contribute to reductions in
energy use which is a critical factor in Green Star accreditation.
Choosing the right insulation also offers the additional benefits
of condensation control, dampening noise and controlling heat
flow in and out of the building.
To achieve the BCA/NCC Section J thermal insulation values, the
roof system must allow sufficient space under the roof sheet for
the insulation to recover to its design thickness to provide its
rated insulation value. Failure to provide enough space will result
in compression of the insulation and reduce its performance.
SafeBridge essentially uses the depth of the purlins to provide
a cavity for the insulation to recover to its design thickness,
rather than create a space above the purlin using a roof spacer.
Through the development of a patented bridging system and
keyway, SafeBridge allows the purlin bridging to be set at a
predetermined height during the design phase.
2.2 Designing for Worker Safety
A unique feature of the system is the application of the
safety mesh between, rather than over the top of the purlins.
This configuration eliminates the need to ‘lap’ safety mesh and
cover the purlins, resulting in immediate wire mesh material
cost savings. Additionally, this method of assembly allows the
use of the SafeBridge Wire Pulley system which not only saves
time in applying the wire mesh, but also removes workers
from the exposed edge of the roof during construction, greatly
increasing their safety.
2.3 Design Considerations
The space created between the SafeBridge bridge bar and the
underside of the roof sheet is exactly the right depth to suit
the insulation and to ensure control of condensation on the
underside of the roof sheet and purlins. As the SafeBridge
system is integrated into the purlin and bridge bar assembly,
there is little or no change to the roof design. Specified designs
primarily need to consider the SafeBridge purlin spacing and
bridge bar location relative to other roofing components during
the design phase. In summary, SafeBridge:
Can achieve high thermal performance in any climate zone
(as defined by the BCA/NCC)
Requires no additional roof spacers to elevate the roof sheet
above the purlin
Retains the structural integrity and load points of the roof interior
Suits most roof pitches and complex roof designs
Is available with either foil, decorative or acoustic finishes
on the internal faced insulation material
Can be used in cyclonic regions in conjunction with cyclonic
rated components.
Does not increase the size of the roof cavity space and
subsequent capacity of building services.
INTRODUCTION
SAFEBRIDGE SYSTEM OVERVIEW Code compliant with BCA/NCC Section J
Uses the purlin space without elevating
the overall roof or fascia height
Creates a safer roof environment for
workers during construction
Suitable for cyclonic and non-cyclonic
regions
Figure 1.
Metroll SafeBridge® purlin
Thermal break tapeBradford
Anticon™ SB
Roof sheet
SafeBridge®Bridge Bar
Australian MeshSafeBridge® mesh
3.0
SafeBridge® is a unique, patented system that combines roof safety with BCA Section J compliance without the use of roof spacers.
SafeBridge utilises the depth of the purlin and the position of the purlin bridge bar to create exactly the right amount of space to
comply with Section J of the BCA, which states that, where required, insulation must comply with AS/NZS4859.1 and be installed so
that it maintains its position and thickness. SafeBridge is a unique system that is application specific and must be 'designed into the
building' with standard purlin spacing; 610/910/1210/1360mm. The SafeBridge system has been jointly developed by Metroll, CSR
Bradford, ITW Buildex, Australian Mesh & SafeBridge and is exclusively available when combining all of these system components.
1.0
2.0
PAGE 2 SafeBridge
KEY DESIGN ELEMENTS
Purlin Keyway - simple roofing screw assembly
Anticon SB has centre bonded foil lap to protect purlins from condensation
Bridge Bar Stabiliser - prevents purlin ‘roll’R0.2 Thermal Break Tape - 10mm thick
Standard Purlin Spacing610mm, 910mm, 1210mm, 1360mm
Bridge Bar Spacing Maximum 1500mm
3.0
Important Purlin Spacing Design Considerations:
SafeBridge relies upon specific purlin spacing listed in Table 1.
Please ensure that you consult with Bradford and Metroll early
in the design phase to understand the relationship of purlin
depth and spacing to R-Value and the BMT relative to your
ultimate roof design loads.
Table 1. Purlin and Bridge Bar Spacing
SafeBridge PAGE 3
Tem
pera
ture gra
die
nt
THERMAL DESIGN TABLES – PERFORMANCE SOLUTIONS FOR ALL APPLICATIONS
4.1 BCA/NCC Compliant Series – Deemed to Satisfy Solutions
The BCA/NCC represents the minimum level of insulation
for good energy efficiency and performance of the building
envelope. Given the relatively low capital cost of insulation,
increasing roofing insulation R-Values during the design phase
can decrease the air conditioning load, thus reducing project
capital equipment costs as well as future running costs.
Table 2 below outlines the minimum SafeBridge system
insulation requirements to meet the Deemed to Satisfy
provisions of the BCA/NCC.
The BCA/NCC also sets out a requirement for adjustment of
minimum R-Value to compensate for loss of ceiling insulation.
Please note the following tables do not address solutions where
the loss of ceiling insulation exceeds the amount nominated in
BCA/NCC table J1.3b. Please refer to the BCA/NCC for further
details and contact Bradford for solutions.
The flexibility of the SafeBridge system allows a variety of
different thermal solutions to be achieved by changing the
combination of purlin depth and insulation products. Whilst
these combinations are infinite, the two series below and on
the next page provide a range of solutions for most applications,
ranging from simple code compliance through to high R-Value
solutions. If the right solution for your project is not listed,
contact Bradford for project specific design support.
Roof sheet
Thermal break tape
Purlin
Bulk insulation
Foil facing
Safety mesh
Figure 2. SafeBridge component configuration
Table 2. BCA/NCC COMPLIANT SERIES
Roof SystemsMetal roof with
no ceiling - R0900 (reflective)
Metal roof with no ceiling - R0900
(non-reflective)
Metal roof with suspended ceiling -
R1000 (100-600mm cavity)
Metal roof with suspended ceiling -
R1000 (> 600mm cavity)
System Illustrations
BCA/NCC Compliant
Year
Climate Zone
Heat Direction
Solar Absorbance#
Required Total R-Value
[RT]
BCA/NCC Compliant Insulation Product Note: Thinner blanket must be on top for dual blanket applications
2010 to
2011
Zone 1,2,3
Inwards
Very Light R3.2 Anticon SB110 RM2.5 Anticon SB145 RM3.6 Anticon SB100 RM2.3 Anticon SB100 RM2.3
Light R3.7 Anticon SB130 RM3.0Anticon SB110 + Roof blanket 60mm RM3.8
Anticon SB100 RM2.3 Anticon SB110 RM2.5
Dark R4.2 Anticon SB145 RM3.6Anticon SB130 + Roof blanket 60mm RM4.3
Anticon SB100 RM2.3 Anticon SB130 RM3.0
Zone 4,5,6
Inwards All R3.2 Anticon SB110 RM2.5 Anticon SB145 RM3.6 Anticon SB100 RM2.3 Anticon SB100 RM2.3
2012to
2014
Zone 1,2,3, 4&5
Inwards
Very Light R3.2 Anticon SB110 RM2.5 Anticon SB145 RM3.6 Anticon SB100 RM2.3 Anticon SB100 RM2.3
Light R3.7 Anticon SB130 RM3.0Anticon SB110 + Roof blanket 60mm RM3.8
Anticon SB100 RM2.3 Anticon SB110 RM2.5
Dark R4.2 Anticon SB145 RM3.6Anticon SB130 + Roof blanket 60mm RM4.3
Anticon SB100 RM2.3 Anticon SB130 RM3.0
Zone 61 Inwards All R3.2 Anticon SB110 RM2.5 Anticon SB145 RM3.6 Anticon SB100 RM2.3 Anticon SB100 RM2.3
2010 to
2014
Zone 71 Outwards All R3.7 Anticon SB145 RM3.6 Anticon SB145 RM3.6 Anticon SB130 RM3.0 Anticon SB130 RM3.0
Zone 81&2 Outwards All R4.8Anticon SB130 + Roof blanket 60mm RM4.3
Anticon SB145 + Roof blanket 60mm RM4.9
Anticon SB110 + Roof blanket 60mm RM3.8
Anticon SB110 + Roof blanket 60mm RM3.8
Note: Refer to the ICANZ handbook for detailed descriptions of roof constructions and thermal calculation parameters. Note that quoted R-Values are based on reflective Thermofoil facings and are not applicable to decorative facings unless stated – please contact Bradford for assistance when calculating R-Values for these materials. Refer to the relevant BCA/NCC Solar Absorbance table for the buildings roof colour. 1. For condensation control, use of roof sarking products such as EnvirosealTM ProctorWrapTM High Tensile Roof (HT-R) is recommended. Whilst all lap joints and penetrations are to be taped using Proctor Plain tape. Excludes high humidity applications (eg. swimming pools) – please consult Bradford. 2. Please consult Bradford for zone 8 projects.
4.0 5.0
6.0
PAGE 4 SafeBridge
ULTIMATE PERFORMANCE SERIES – R-VALUE BY PURLIN SIZEFor applications that require R-Values beyond code compliance or simply the flexibility to achieve an R-Value for a non code compliant
application, Table 3 below highlights the maximum thermal performance that can be achieved for each Metroll purlin height. By
selecting the required R-Value and purlin depth, the base material thickness (BMT) and purlin spacing can then be customised based
upon the projects structural requirements. Impressive thermal insulation R-Values up to RM5.5 (inwards for a roof with no ceiling) can
be achieved with the Bradford Anticon SB insulation which has been specifically developed to complement the SafeBridge system.
SYSTEM COMPLIANCE – ADVANCED TESTING PROGRAMSafeBridge is an innovative roofing system that has undergone hundreds
of hours of development and testing to ensure it performs in accordance
to its published specifications and the building code. As part of this
program, the SafeBridge system has undergone experimental temperature
analysis using a roof section to validate 3 dimensional theoretical
modelling of heat transfer calculations. This complex process was used
to develop the new generation of Bradford Anticon SB thermal insulation
used in the SafeBridge system to ensure effective management of
condensation across all climate zones through the purlin and adjacent
materials (roof sheet, mesh, screw, insulation and thermal break tape).
Modification of this system by the substitution of similar or alternative
products cannot be guaranteed to perform in accordance with the stated
information provided in this and other documentation. Please note that
the design of high humidity applications (such as indoor swimming pools)
should always be reviewed with Bradford during the design phase.
Table 3. ULTIMATE PERFORMANCE SERIES
Roof SystemsMetal roof with
no ceiling - R0900 (reflective)
Metal roof with no ceiling - R0900
(non-reflective)
Metal roof with suspended ceiling -
R1000 (100-600mm cavity)
Metal roof with suspended ceiling - R1000 (> 600mm
cavity)
System Illustrations
Metroll Purlin Size
Bradford InsulationMaterial R-Value
[RM]
Heat Direction
Maximum Total R-Value [RT]Note: Thinner blanket must be on top for dual blanket applications
150mm Anticon SB100 R2.3Inwards R3.0 R2.4 R4.2 R3.5
Outwards R2.7 R2.6 R3.2 R3.2
150mm Anticon SB110 R2.5Inwards R3.2 R2.6 R4.4 R3.7
Outwards R2.9 R2.8 R3.4 R3.4
200mm Anticon SB130 R3.0Inwards R3.7 R3.1 R4.9 R4.2
Outwards R3.4 R3.3 R3.9 R3.9
200mm Anticon SB145 R3.6Inwards R4.3 R3.6 R5.5 R4.7
Outwards R4.1 R3.9 R4.6 R4.6
250mmAnticon SB110 + Roof
blanket 60mmR3.8
Inwards R4.4 R3.8 R5.7 R4.9
Outwards R4.3 R4.2 R4.8 R4.8
300mmAnticon SB130 + Roof
blanket 60mmR4.3
Inwards R4.9 R4.3 R6.1 R5.4
Outwards R4.8 R4.7 R6.3 R5.3
300mmAnticon SB145 + Roof
blanket 60mm R4.9
Inwards R5.5 R4.9 R6.7 R5.9
Outwards R5.4 R5.3 R6.0 R5.9
Figure 3. Complex Thermal Modeling of Temperature
Analysis Across Roof Structure
5.0
6.0
SafeBridge PAGE 5
INSTALLATION DETAILS
Step 6: Roll thermal breath tape along the purlin to prevent thermal bridging.
Step 5: Attach wire to bridging (same as step 3). Area is now safe with fall protection installed.
Step 2: Screw off the bridging. Bridge bar fixing uses a standard Metal-Tek screw through both bars, and final screw in centre of bridge bar secures the system.
Step 1: Install the bridging. Telescopic bridge bars fit all purlin spacing and the punched SafeBridge keyway accepts bridge bars from each side.
Step 8: Lay roof on purlins and screw off.Step 7: Roll out insulation. Safety wire and insulation components are cradled within the purlins, hence leaving the purlins visible as a working surface/footing area.
Step 4: Pull wire on wire pulley. Improved safety is achieved by utilising a unique ‘trolley system’ to lay the safety mesh between the purlins – this allows workers to remain safely secured below the roof surface, rather than above it on the open roof.
Step 3: Attach wire to bridging. Safety mesh should be tied to bridge with no side lap joints, this reduces installation time as well as the overall amount of material required as the mesh does not need to cover the purlin and overlap by 150mm.
7.0
(c) SafeBridge 2013
(c) SafeBridge 2013
(c) SafeBridge 2013
(c) SafeBridge 2013
(c) SafeBridge 2013
(c) SafeBridge 2013
(c) SafeBridge 2013
8.0Installation details for a typical SafeBridge application, excludes requirements for condensation control or for an aesthetic appearance, where sarking products may be required.
9.0
PAGE 6 SafeBridge
8.0SPECIFYING SAFEBRIDGEWhen specifying SafeBridge, the following components have
been tested and recommended to achieve the performance
standards specified in this document:
Metroll SafeBridge Purlins and Bridge Bars
Bradford SafeBridge Anticon SB[size] RM[value] centrally
faced with Bradford Thermofoil Medium Duty [plus optional
additional specification - laid on top of Bradford Thermoplast
993 White - laid separately]
Bradford Thermal Break Tape 10mm
Australian Mesh SB[width] SafeBridge Safety
Mesh supplied by Bradford Insulation (installed between the
purlins)
ITW Buildex Metal Tech Screws
Metal roof sheet to suit
SAFETY CREDENTIALS
Safety is key to the SafeBridge system – reduce risk further by
utilising the SafeBridge Mesh Trolley which allows installation
of the safety mesh from below the roof surface from the safety
of a scissor lift. SafeBridge Mesh Trolley needs to be purchased
separately and is available from Metroll.
FINALIST
2011 WINNER Best solution of an OHS&E Specific Workplace Risk Award
2010 FINALIST Safe Work Australia Awards
2010 WINNER Safety Product Solution of the Year QLD Worksafe Awards
9.0The SafeBridge roofing system represents an evolutionary step forward in the construction process of metal framed roofing and
has been acknowledged as a safer roofing system by some of the peak safety bodies of Australia. In 2010 SafeBridge won Safety
Product of the Year in the Queensland Work Safe Awards and shortly after was a finalist in the 6th Annual National Safe Work
Australia Awards. The following year, SafeBridge was recognised by winning the National Safety Council of Australia Awards Best
Solution of an OHS&E Specific Workplace Risk Award 2011.
SafeBridge PAGE 7
For more information call 1300 850 305 or visit www.bradfordinsulation.com.au
CSR Bradford Locked Bag 1345 North Ryde BC NSW 1670
CSR Bradford is a business division of CSR Building Products Limited ABN 55 008 631 356
The contents of this brochure are copyright protected and may not be reproduced in any form without prior written consent of CSR Bradford. Recommendations and advice regarding the use of the products described in this brochure are to be taken as a guide only, and are given without liability on the part of the company or its employees. We reserve the right to change product specifications without prior notification, please refer to the CSR Bradford website for the latest revision of this document. The purchaser should independently determine the suitability of the product for the intended use and application.68
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PRODUCT DETAILS10.0
SAFEBRIDGE ROOFING SYSTEM
ProductBase
Blanket R-Value
Nominal Thickness
Min. Purlin Height
FacingStd Size
(m)x(mm)Suitable for std purlin spacing
Product Code
Anticon 100 SB R2.3 100mm 150mm Med Duty 10m x 620mm 610mm 112516
Anticon 100 SB R2.3 100mm 150mm Med Duty 10m x 920mm 910mm 111687
Anticon 100 SB R2.3 100mm 150mm Med Duty 10m x 1220mm 1210mm 105506
Anticon 100 SB R2.3 100mm 150mm Med Duty 10m x 1370mm 1360mm 126662
Anticon 110 SB R2.5 110mm 150mm Med Duty 10m x 620mm 610mm 122533
Anticon 110 SB R2.5 110mm 150mm Med Duty 10m x 920mm 910mm 110172
Anticon 110 SB R2.5 110mm 150mm Med Duty 10m x 1220mm 1210mm 112503
Anticon 110 SB R2.5 110mm 150mm Med Duty 10m x 1370mm 1360mm 112504
Anticon 130 SB R3.0 130mm 200mm Med Duty 10m x 620mm 610mm 112532
Anticon 130 SB R3.0 130mm 200mm Med Duty 10m x 920mm 910mm 111688
Anticon 130 SB R3.0 130mm 200mm Med Duty 10m x 1220mm 1210mm 107982
Anticon 130 SB R3.0 130mm 200mm Med Duty 7.5m x 1370mm 1360mm 126663
Anticon 145 SB R3.6 145mm 200mm Med Duty 7.5m x 620mm 610mm 123385
Anticon 145 SB R3.6 145mm 200mm Med Duty 10m x 920mm 910mm 126753
Anticon 145 SB R3.6 145mm 200mm Med Duty 7.5m x 1220mm 1210mm 126665
Anticon 145 SB R3.6 145mm 200mm Med Duty 6.5m x 1370mm 1360mm 103936
SAFEBRIDGE ROOF INSULATION – MESH
SafeBridge Safety Mesh50m x 600mm
(300 x 150)610mm 105276
50m x 900mm (300 x 150)
910mm 104052
50m x 1200mm (300 x 150)
1210mm 104032
50m x 1350mm (300 x 150)
1360mm 104048
SafeBridge Safety Mesh with PVC50m x 600mm
(300 x 150)610mm 116854
50m x 900mm (300 x 150)
910mm 104054
50m x 1200mm (300 x 150)
1210mm 104046
50m x 1800mm (300 x 150)
1360mm 118289