Gamma+ GBF220 Technical document

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GAMMA
BRACING
TECHNOLGIES
LIMITED
GAMMA
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NEW ZEALAND’S
MOST ADVANCED
BRACING SYSTEM
FOR TIMBER FRAME
CONSTRUCTIONS
ISSUE MARCH 2019
TECHNICAL
INSTALLATION MANUAL
DESIGNED BY GAMMA TECHNOLOGIES LTD
Copyright 2014 GBF220 GBF400 GBF600

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1.0 General Information
1. Gamma withstands multiple wind and/or earthquake
traumas and maintains its structural integrity.
2. Gamma has a high “Ductility” so it can flex without
failure.
3. Gamma’s are best installed early in the construction to
immediately provide bracing performance.
4. Gamma’s eliminate the majority of temporary bracing.
5. It’s fast and easy to install either onsite or in a frame &
truss plant.
6. Gamma comes with pre-punched fixing & service
holes.
7. Gamma’s are lightweight and of a robust construction
(12.5kg).
8. Gamma’s are suitable for remedial work for buildings
affected by leaky building syndrome.
9. Gamma’s can be installed in wet area’s and area’s
where no linings are installed.
10. Gamma’s provide up to 150 Bu’s per metre
(1 kN = 20 BU’s).
11. Gamma’s have a conditional 50 year B2 durability.
12. Gamma’s are cost competitive within the total
construction costs.
13. Gamma’s are suitable for standard timber framing,
either 600, or 400/450 or 220mm stud widths.
14. Effective on both Concrete and Timber bases.
15. Designed and manufactured for New Zealand
environments.
16. 100% Recycable so very small environmental
footprint.
17. Will provide structural bracing for the lifetime of
the building.
18. It is fully compliant with New Zealand Building Codes.
19. Gamma’s may be used in combination with other
bracing systems, eg. plasterboard and plywood.
1.0 General Information

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Contents
Section No. Description Page
1.0 General Information 2
1.1 Introduction 4
1.2 Warranty 4
1.3 Benets of using Gamma Bracing system 4
2.0 Compliance Statement 5
2.1 The New Zealand Building Code (NZBC) 5
2.1.1 Clause B1 Structure 5
2.1.2 Clause B2 Durability 5
2.1.3 Clause F2 Hazardous Building Materials 5
2.2 Purpose of Product 5
2.3 Scope of acceptable use 5
2.4 Limitations of use 6
2.5 Who may install the Gamma Bracing system 6
2.6 Health & Safety 6
2.7 Compatibility with associated products 6
3.0 Performance & Construction 7
3.1 System Summary Table – Table 1 7
4.0 Gamma Bracing Software & Design Procedure 8
4.1 Gamma Bracing Software - Demand 8
4.2 Gamma Bracing Software - Achieved 9
5.0 Installation Procedure 10
6.0 Gamma Bracing Frame GBF220S 13
6.1 Gamma Bracing System GBF220S – Construction Drawing (Wall Height 2.1m) 14
7.0 Gamma Bracing Frame GBF220 15
7.1 Gamma Bracing System GBF220 – Construction Drawing (Wall Height 2.4m) 16
8.0 Gamma Bracing Frame GBF400S 17
8.1 Gamma Bracing System GBF400S – Construction Drawing (Wall Height 2.1m) 18
9.0 Gamma Bracing Frame GBF400 19
9.1 Gamma Bracing System GBF400 – Construction Drawing (Wall Height 2.4m) 20
9.2 Gamma Bracing System GBF400 – Construction Drawing (Wall Height 2.7m) 21
9.3 Gamma Bracing System GBF400 – Construction Drawing (Wall Height 3.0m) 22
10.0 Gamma Bracing System GBF450S – Construction Drawing (Wall Height 2.1m) 23
10.1 Gamma Bracing System GBF450 – Construction Drawing (Wall Height 2.4m) 24
10.2 Gamma Bracing System GBF450 – Construction Drawing (Wall Height 2.7m) 25
10.3 Gamma Bracing System GBF450 – Construction Drawing (Wall Height 3.0m) 26
11.0 Gamma Bracing System GBF535S – Construction Drawing (Wall Height 2.1m) 27
11.1 Gamma Bracing System GBF535 – Construction Drawing (Wall Height 2.4m) 28
11.2 Gamma Bracing System GBF535 – Construction Drawing (Wall Height 2.7m) 29
11.3 Gamma Bracing System GBF535 – Construction Drawing (Wall Height 3.0m) 30
12.0 Gamma Bracing Frame GBF600S 31
12.1 Gamma Bracing System GBF600s – Construction Drawing (Wall Height 2.1m) 32
13.0 Gamma Bracing Frame GBF600 33
13.1 Gamma Bracing System GBF600 – Construction Drawing (Wall Height 2.4m) 34
13.2 Gamma Bracing System GBF600 – Construction Drawing (Wall Height 2.7m) 35
13.3 Gamma Bracing System GBF600 – Construction Drawing (Wall Height 3.0m) 36
14.0 Gamma Bracing System GBPF – Gamma Bracing Portal Frame Construction Drawing (Wall Height 2.4m) 37
14.1 Gamma Bracing System GBPF – Gamma Bracing Portal Frame Construction Drawing (Wall Height 2.7m) 38
15.0 Construction Details – Construction Drawing – 2 x GBF600 (Wall Height 2.4m) 39
15.1 Construction Details - Construction Drawing – 2 x GBF600 (Wall Height 2.7m) 40
15.2 Construction Details – Construction Drawing – 2 x GBF600 (Wall Height 3.0m) 41
15.3 Construction Details – Construction Drawing – Multiple GBF600 Frames (Wall Height 3.0m) 42
15.4 Construction Details – Construction Drawing – [Exterior] Walls on Concrete Floors 43
15.5 Construction Details – Construction Drawing – [Interior] Walls on Concrete Floors 44
15.6 Construction Details – Construction Drawing – [Exterior] Walls on Timber Floors 45
15.7 Construction Details – Construction Drawing – [Interior] Walls on Timber Floors 46
15.8 Construction Details – Construction Drawing – Height Adjustment 47
16.0 Construction Details – Ancillary Products 48
16.1 Construction Details – Fasteners 48
16.2 Construction Details – Hold Down Anchors 48
16.3 Construction Details – Insulation 48
16.4 Construction Details – Electrical Equipment 49
16.5 Construction Details – Plumbing Equipment 49

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1.0 General Information
1.1. Introduction
Gamma Bracing system technology has been specifically
designed and rigorously tested in New Zealand to
provide structural bracing for both residential and light
commercial buildings within the scope and limitations of
NZS3604:2011.
The Gamma Bracing System has been tested in
accordance with the New Zealand Building Code,
verification method B1/VM p21 {2010} racking test limited
states design; cited in NZS3604 Timber Framed Buildings
to determine wind and earthquake ratings of bracing
elements. This aligns with the new loadings standard
AS/NZS 1170.
CodeMark Certication
Having met New Zealand’s stringent standards, the
Gamma Bracing system is the future solution for wall
bracing requirements within timber framed buildings.
1.2. Warranty
The Gamma Bracing system carries the following warranty.
This warranty is given by Gamma Bracing Technology Ltd
(“The Manufacturer”)
The manufacturer warrants that the products produced
by the manufacturer shall be free of defects in materials
and manufacture. If the products produced by the
manufacturer do not meet the manufacturers standards,
they will replace with the equivalent product. The
manufacturer advises that only products, components and
systems recommended by Gamma Bracing Technologies
Ltd be used. At all times these must be used in accordance
with the relevant product manufacturers usage
recommendations.
If this is not done, the manufacturer will need to be
satisfied that any defect in it’s product is attributable
to the failure of the manufactured product to meet the
manufacturers standard (and not another clause) before
this warranty applies. This warranty excludes all other
warranties and liability for damage or loss in connection
with the defects in the manufacturers product other than
those imposed by legislation.
1.3. Benets of using Gamma Bracing System
The design of the Gamma Bracing system allows for
easy installation for both new and existing buildings. No
additional, specialty bracing linings are required other than
to provide standard interior finishings.
Once the Gamma Bracing system has been installed, the
bracing requirements of the building are completed and
therefore the need for temporary timber bracing
is significantly reduced; saving time and cost as well as
providing a safer working environment.
Inspection by the Building Consent Authority of the
bracing system can be done early in the construction
programme. No further inspections of bracing elements
are required, thus another saving of time and money.
Using the Gamma Bracing System removes the need for
other types of bracing such as galvanised straps, which
connect the stud with the bottom plate. By removing the
need for these straps a flatter surface is provided for the
installation of the interior lining.
Provided the timber frame moisture levels, as detailed
in NZS3604:2011 and NZS3602; are followed and the
Gamma Bracing system is used in a closed environment,
the Gamma Bracing frames once installed do not require
maintenance. Provided the requirements of NZ Steel’s
GalvsteelTM (Axxis 550) Durability Statement are met,
the Gamma Bracing frames are unaffected by weather
conditions.
Gamma Bracing frames are provided with a warning label
advising that the structural integrity of the building must
be maintained at all times. This is to prevent the possible
removal or modification of the Gamma Bracing system
during renovation work.
Each Gamma Bracing frame provides significant bracing
values for both wind and earthquake demand. Total
bracing integrity can be achieved wherever Gamma
Bracing frames are positioned throughout the buildings
structure.

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2.0 Compliance Statement
2.1. The New Zealand Building Code (NZBC)
The Gamma Bracing System when installed in accordance
with the installation details will comply with the New
Zealand Building Code requirements as detailed in this
document.
2.1.1. Clause B1 Structure
B1.1 Objective
The objective of this provision is to:
a) Safeguard people from injury caused by structural
failure.
b) Safeguard people from loss of amenity caused by
structural behaviour.
c) Protect other property from physical damage caused
by structural failure.
B1.2 Functional Requirements
Buildings and building elements and site works must
withstand the combination of loads that they are likely
to experience during construction or alteration and
throughout their lives.
B1.3 Performance
B1.3.1 Buildings, building elements and sitework shall
have a low probability of rupturing, becoming unstable,
losing equilibrium, or collapsing during construction,
alteration and throughout their lives.
B1.3.2 Buildings, building elements and sitework shall
have a low probability of causing loss of amenity through
undue deformation, vibratory response, degradation, other
physical characteristics throughout their lives, or during
construction of alteration when building is in use.
2.1.2. Clause B2 Durability
B2.1 Objective
The objective of this provision is that the building will
throughout it’s life will continue to satisfy the other
objectives of the code.
B2.2 Functional Requirement
Building materials, components and construction
methods shall be sufficiently durable to ensure that the
building, without reconstruction or major renovations,
satisfies the other functional requirements of the code
throughout the life of the building.
B2.3.1 Performance
From the time a code compliance certificate is issued,
building elements shall, with only normal maintenance,
continue to satisfy the performance of this code for the
lesser of the specified intended life of the building, if
stated or:
a) The life of the building, being not less than 50 years if:
(i) Those building elements (including floors, walls and
fixings) provide structural stability to the building, or
(ii) Those building elements are difficult to replace, or
(iii) Failure of those building elements to comply with the
building code would go undetected during both normal
use and maintenance of the building.
2.1.3. Clause F2 Hazardous Building Materials
F2.1 Objective
The objective of this provision is to safeguard people
from injury and illness caused by exposure to hazardous
building materials.
F2.2 Functional Requirements
Building materials which are potentially hazardous shall be
used in ways that avoid undue risk to people.
F2.3.1 Performance
The quantities of gas, liquid, radiation or solid particles
emitted by materials used in the construction of buildings,
shall not give rise to harmful concentrations at the surface
of the material where the material is exposed, or in the
atmosphere of any space.
2.2. Purpose of product
To provide a durable, reliable and cost effective building
element for the structural and bracing performance levels
as specified within this manual.
2.3 Scope of acceptable use
Acceptable use as structural bracing systems for both
residential and light commercial buildings and within the
scope and limitations of NZS3604:2011.
If the Gamma Bracing system is to be considered for
installation other than in accordance with the trademark
certificate, specific engineering will be required.
The Gamma Bracing frame is located within the cavity
of the wall and is not to be exposed to external weather
conditions. The frame is manufactured from materials that
have protective coatings to resist corrosion during the
construction period.

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2.0 Compliance Statement
2.4. Limitations of use
For use:
• In the interior cavity of internal and external walls in
accordance the manufacturers installation instructions.
• To be used within the scope and limitations of
NZS3604:2011
• To be installed by or the installation to be supervised
by a licensed building practitioner with the appropriate
license class where the building work has been identified
as Restricted Building Work.
2.5. Who may install the Gamma Bracing system
Installation of the Gamma Bracing system must be
undertaken or the installation be installed by a Licensed
Building Practitioner with the appropriate license category
where the building work has been identified as Restricted
Building Work.
2.6. Health & Safety
It is important to follow good site practice at all times and
to ensure appropriate safety precautions are taken when
installing the Gamma Bracing system and all supporting
components.
2.7. Compatibility with associated products
The Gamma Bracing system and its components are
compatible with most associated building products,
however it is recommended that the installer refers to
NZS3604:2011 Section 4 Durability to ensure compatibility
with other materials.

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3.0 Performance and Construction
The performance and construction of the Gamma Bracing systems is detailed in Table 2. The values for wind and
earthquake are obtained from testing and evaluation that has been carried out in accordance with NZS3604:2011 and
P21[2010] test and evaluation procedures.
TABLE 1 Performance & Construction
Gamma
System
Reference
Performance
Bracing Units (BU’s)
Stud Qty & Conguration
(Min Stud Size 90 x 45mm) System Size Including Framing
Wind Earth
Stud Centres
(mm)
Left
Side
Right
Side
Minimum Wall
length (mm)
Minimum Wall
Height (mm)
Maximum Wall
Height (mm)
Page
#
GBF220S/2100 45 53 310 2 2 400 2100 2400 14
GBF220/2400 37 44 2 2 2400 2700 16
GBF400S/2100 51 63
400
1 1
445
2100 2400 18
GBF400/2400 45 55 1 1 2400 2700 20
GBF400/2700 40 40 1 1 2700 3000 21
GBF400/3000 35 40
400
1 1
490
3000 3300 22
GBF450S/2100 65 74 1 2 2100 2400 23
GBF450/2400 57 65 1 2 2400 2700 24
GBF450/2700 50 57 1 2 2700 3000 25
GBF450/3000 45 52
400
1 2
535
3000 3300 26
GBF535S/2100 79 86 2 2 2100 2400 27
GBF535/2400 69 75 2 2 2400 2700 28
GBF535/2700 61 67 2 2 2700 3000 29
GBF535/3000 55 60
600
2 2
600
3000 3300 30
GBF600S/2100 90 90 1 1 2100 2400 32
GBF600/2400 84 90 1 1 2400 2700 34
GBF600/2700 70 70 1 1 2700 3000 35
GBF600/3000 55 60 1 1 3000 3600 36
GBPF/2400 124 137 n/a n/a n/a 6000 2400 2400 37
GBPF/2700 110 122 2700 2700 38
GBF220 + GBF600 39 + 84 - 44 + 90 2220mm + 645mm 2400mm 123 134
GBF400/600 45 + 84 - 55 + 90 1 220mm + 645mm 2400mm 129 145
GBF220/535 39 + 69 - 44 + 75 2 45mm + 535mm 2400mm 108 144
COMBINATIONS OF GBF TYPES - TYPICAL SYSTEMS SEE BELOW
OR ANY OTHER COMBINATION TO MEET DESIRED DESIGN AND BRACING REQUIRED.
3.1 SYSTEM SUMMARY TABLE
Short (Wall Height) P - Portal
Gamma Frame/Wall Length
Gamma Bracing Frame
GBF 220 S

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4.0 Gamma Bracing Software & Design Procedure
4.1 Demand
The Gamma Bracing Calculator Software has been designed to work in
conjunction with NZS3604:2011.
The Demand and Achieved sheets within the Gamma Bracing Calculator
software allow for a fast and simple way to calculate the structural bracing
requirements of a timber framed structure.
The Gamma Bracing Software is preloaded with Gamma bracing systems
values. The software allows the user to use other bracing systems. (Other
bracing system values will require loading into the designated calculation
sheets by the user – refer to terms and conditions).
It is currently acceptable to use a combination of different bracing systems
along the same bracing line. However it is not permitted to place more
than one bracing element in the same position.
Designing the structural aspects of a building require a good knowledge
and understanding of the principles of building timber framed structures.
Gamma Bracing solution V1
Instructions
Project Details
Type in the name of the owner and the property address details
including the Lot number and the DP number. Details for the Architect,
Designer and Engineer can also be added should they be required.
Calculating the Demand
Input the information of the building into the required cells. Cells
with drop down lists provide options to choose from – choosing the
“specify” option allows for a custom option or value to be loaded.
Building dimensions, roof and wall cladding weights need to be
inputted to enable a bracing demand to be calculated. Incorrect
information or information not inputted will not provide a result and a
warning notification will be indicated.
Wind demand requirements can be further refined by choosing from
the drop down lists in the Yellow panel.
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11.0 Gamma Bracing Software Calculator - Demand
OVERVIEW
The Gamma Bracing Calculator Software has been designed to work in
conjunction with NZS3604:2011.
The Demand and Achieved sheets within the Gamma Bracing Calculator
software allow for a fast and simply way to calculate the structural bracing
requirements of a timber framed structure.
The Gamma Bracing Software is preloaded with Gamma bracing systems
values. The software allows the user to use other bracing systems. (Other
bracing system values will require loading into the designated calculation
sheets by the user – refer to terms and conditions).
It is currently acceptable to use a combination of different bracing systems
along the same bracing line. However it is not permitted to place more
than one bracing element in the same position.
Designing the structural aspects of a building require a good knowledge
and understanding of the principles of building timber framed structures.
INSTRUCTIONS
Project Details
Type in the name of the owner and the property address details including
the Lot number and the DP number.
Details for the Architect, Designer and Engineer can be also be added
should they be required.
Calculating the Demand
Input the information of the building into the required cells. Cells with
drop down lists provide options to choose from – choosing the “specify”
option allows for a custom option or value to be loaded.
Building dimensions, roof and wall cladding weights need to be inputted
to enable a bracing demand to be calculated. Incorrect information
or information not inputted will not provide a result and a warning
notication will be indicated.
Wind demand requirements can be further rened by choosing from the
drop down lists in the Yellow panel.
Gamma bracing solution V1
Job Description - what is typed here will be reproduced on print sheet.
Warning. This spreadsheet calculates
the bracing rating for the building defined.
It does not check that the building defined
complies NZS 3604 scope.
Building and roofdescription
How many storeys above slab or subfloor?
Foundation type
RoofH = Roof height above eaves (m)
0.00
LR = Maximum roof length (m) 0.00
WR = Maximum roof width (m) 0.00
Roof pitch (degrees)
8
Specified maximum pitch (degrees) option 0.00
Room in roof space?
Roof cladding weight
60
Specified roof cladding weight option (kg/m
2
)
0.00
Floor live load
2.00
Specified floor loading opon (kPa) 2.20
Single storey building denitions
Upper or single storey details
Average exterior wall cladding weight
200
Specified wall cladding weight option (kg/m
2
)0.00
LU = Building length (m) 0.00
WU = Building width (m) 0.00
Gross building plan area (m
2
)0.00
HUI =Interior wall height (m) 0.00
HUE = Exterior wall height (m) 0.00
Lower storey details
Average exterior wall cladding weight
200
Specified wall cladding weight option (kg/m2) 0.00
LL = Building length (m)
0.00
WL = Building width (m) 0.00
Gross building plan area (m2) 0.00
HLI =Interior wall height 0.00
HLE = Exterior wall height 0.00
Two storey building denitions
Subfloordetails
Average exterior wall cladding weight
200
Specified wall cladding weight option (kg/m2) 0.00
LS = Building length (m)
0.00
WS = Building width (m) 0.00
Gross building plan area (m2) 0.00
HS = Subfloor height 0.00 60
Wind speed
Choose which option you wish to use to specify wind speed.
(a) Specify the wind zone such as from Table 5.4 of NZS 3604.
(b) Specify the wind speed in m/sec directly in the adjacent blue cell. Wind speed =50.0 m/sec
(c) Get the wind speed calculated in the yellow zone below as per Table 5.1 of NZS3604.
Wind Zone
Wind Region from Figure 5.1 of NZS 3604
Wind zone determined = Very High
Roughness from Section 5.2.3 of NZS 3604
Exposure from Section 5.2.4 of NZS 3604
Is it a Lee Zone - see Figure 5.1 of NZS 3604?
Topography from Section 5.2.5 of NZS 3604
Earthquake Zone from Figure 5.4 of NZS 3604
Subsoil classification from Section 5.3.3 of NZS 3604
Summary of bracing demand and resistance:
Total Wind Demand/Provided in BU's Demand Provided Demand Provided Demand Provided
Wall along direcon 004040
Wall across direcon 000000
Total EQ Demand/Provided in BU's
Demand Provided Demand Provided Demand Provided
Wall along direcon
#DIV/0! 0 #DIV/0! 0 #DIV/0! 0
Wall across direcon
#DIV/0! 0 #DIV/0! 0 #DIV/0! 0
Check of bracing capacity
Wall along direcon
Wall across direcon
Upper storey
Lower storey
Subfloor
OK Inadequate Inadequate
OK OK OK
HUE
WR
WU
RoofH
HUI
H
WR
WU
HS
H
(a) On slab
(b) W ith Subflo o r
WS
HUI
WL
(a) On slab
HUE
HLE
WR
WU
RoofH
H
HUI
HUE
HLE
HS
H
WR
WU
WL
WS
RoofH
(b) WithSubfloor
HLI
HLI
Two storey
Subfloor
0 to 25 degrees
Light
2 kPa
Light
A
Open
Sheltered
T1
Medium
Light
(a) Specify the wind zone such as from Table 5.4 of NZS 3604.
High
No
1
D
Yes a Lee Zone
The Gamma Bracing System provides bracing performance to resist and achieve Wind and Earthquake demands. To calculated both the Wind and
Earthquake demands Gamma Bracing Technologies Ltd has developed a spread sheet calculator that is in accordance with the requirements of the
NZS3604:2011 Standard. This section details the method of calculating both the demand and achieved requirements using the Gamma spread sheet
calculator. The Gamma Bracing Technologies Ltd spread sheet calculator can be easily downloaded from the Gamma web site www.gammabracing.co.nz.

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4.2 Gamma Bracing Software - Achieved
CALCULATING THE ACHIEVED
The bracing calculation sheets listed below are available within the Gamma
Bracing software to calculate the bracing achieved requirements for house
types that are accordance with the NZS3604:2011 standard. Depending on
the type of house refer to Table 2 when choosing the achieved sheets
Subfloor Along Sheet
Subfloor Across Sheet
Lower Along Sheet
Lower Across Sheet
Upper Along Sheet
Upper Across Sheet
Each achieved sheet allows the option to choose from the preferred
Gamma Bracing systems individual bracing elements as well as the bracing
systems listed below. These systems will require the correct references and
values to be inputted prior to being used in each of the achieved sheets.
PRINT SHEET
The Print Sheet automatically stores data from the Main Menu and each of the Along and Across sheets to provide a print version of the bracing
calculations. Once the calculations have been completed go to the Print Sheet to print off the information.
Strictly follow the manufacturer’s instructions and ensure the correct
Wind and Earthquake values are used. When panel or sheet bracing
systems are used the wall length will be required to calculate the
bracing values of each bracing element.
Foundations
Plywood
Plasterboard
User Defined (Customer bracing systems)
The wind and earthquake demand values from the demand sheet are
displayed cells at the top of the achieved sheet. Calculate the bracing
achieved until the demand value is achieved or exceeded.
For exterior wall bracing lines load in the exterior wall length in
meters and ensure the demand value detailed for that bracing line is
achieved.
A warning note will be visible if the demand is not achieved.
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11.1 Gamma Bracing Software - Achieved
CALCULATING THE ACHIEVED
The bracing calculation sheets listed below are available within the Gamma
Bracing software to calculate the bracing achieved requirements for house
types that are accordance with the NZS3604:2011 standard. Depending on
the type of house refer to Table 1 when choosing the achieved sheets
Suboor Along Sheet
Suboor Across Sheet
Lower Along Sheet
Lower Across Sheet
Upper Along Sheet
Upper Across Sheet
Each achieved sheet allows the option to choose from the preferred Gamma
Bracing systems individual bracing elements as well as the bracing systems
listed below. These systems will require the correct references and values
to be inputted prior to being used in each of the achieved sheets.
Strictly follow the manufacturer’s instructions and ensure the correct Wind
and Earthquake values are used. When panel or sheet bracing systems are
used the wall length will be required to calculate the bracing values of each
bracing element.
Foundations
Plywood
Plasterboard
User Dened (Custom bracing systems)
The wind and earthquake demand values from the demand sheet are
displayed cells at the top of the achieved sheet. Calculated the bracing
achieved until the demand value is achieved or exceeded.
For exterior wall bracing lines load in the exterior wall length in meters and
ensure the demand value detailed for that bracing line is achieved.
A warning note will be visible if the demand is not achieved.
Wind
BU's
EQ
BU's
Total bracing achieved 0 0
Total bracing required 0 0
Upper or single storey bracing walls OK OK
This sheetdefines bracing wallsin the along direction
Line
name
Bracing
element
label
Source of
published
bracing rating
Bracing wall type
1 or wall
length in
metres
Wall
Height
(metres)
Wall
angle in
degrees
Wind
BU's
EQ
BU's
Is bracing element
length specified less
than minimum?
Bracing line
bracing
capacity BU's
If external wal
l
give length (m)
Requirement
for internal
walls
Requirement
for external
walls
A1 1 2.4 0 0 0 OK
A2 1 2.4 0 0 0 OK
A3 1 2.4 0 0 0 OK
A4 1 2.4 0 0 0 OK
A5 1 2.4 0 0 0 OK
A6 1 2.4 0 0 0 OK
B1 1 2.4 0 0 0 OK
B2 1 2.4 0 0 0 OK
B3 1 2.4 0 0 0 OK
B4 1 2.4 0 0 0 OK
B5 1 2.4 0 0 0 OK
B6 1 2.4 0 0 0 OK
C1 1 2.4 0 0 0 OK
C2 1 2.4 0 0 0 OK
C3 1 2.4 0 0 0 OK
C4 1 2.4 0 0 0 OK
C5 1 2.4 0 0 0 OK
C6 1 2.4 0 0 0 OK
D1 1 2.4 0 0 0 OK
D2 1 2.4 0 0 0 OK
D3 1 2.4 0 0 0 OK
D4 1 2.4 0 0 0 OK
D5 1 2.4 0 0 0 OK
D6 1 2.4 0 0 0 OK
E1 1 2.4 0 0 0 OK
E2 1 2.4 0 0 0 OK
E3 1 2.4 0 0 0 OK
E4 1 2.4 0 0 0 OK
E5 1 2.4 0 0 0 OK
E6 1 2.4 0 0 0 OK
F1 1 2.4 0 0 0 OK
F2 1 2.4 0 0 0 OK
F3 1 2.4 0 0 0 OK
F4 1 2.4 0 0 0 OK
F5 1 2.4 0 0 0 OK
F6 1 2.4 0 0 0 OK
G1 1 2.4 0 0 0 OK
G2 2.5 2.4 0 0 0 OK
G3 1 2.4 0 0 0 OK
G4 1 2.4 0 0 0 OK
G5 1 2.4 0 0 0 OK
G6 1 2.4 0 0 0 OK
Values achieved
Check minimum bracing rating in Section 5.4.7 of NZS 3604
A0 0
B0 0
C0 0
D0 0
E0 0
F0 0
G0 0
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
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None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
None
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None
None
None
None
None
None
None
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None
None
None
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None
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None
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None
None
None
None
Calculating the Achieved
The bracing calculation sheets listed below are available within the
Gamma Bracing software to calculate the bracing achieved
requirements for house types that are accordance with the
NZS3604:2011 standard. Depending on the type of house refer to
Table 1 when choosing the achieved sheets
Subfloor Along Sheet
Subfloor Across Sheet
Lower Along Sheet
Lower Across Sheet
Upper Along Sheet
Upper Across Sheet
Each achieved sheet allows the option to choose from the preferred
Gamma Bracing systems individual bracing elements as well as the
bracing systems listed below. These systems will require the correct
references and values to be inputted prior to being used in each of the
achieved sheets.
Strictly follow the manufacturer’s instructions and ensure the correct
Wind and Earthquake values are used. When panel or sheet bracing
systems are used the wall length will be required to calculate the
bracing values of each bracing element.
Foundations
Plywood
Plasterboard
User Defined (Custom bracing systems)
The wind and earthquake demand values from the demand sheet are
displayed cells at the top of the achieved sheet. Calculated the bracing
achieved until the demand value is achieved or exceeded.
For exterior wall bracing lines load in the exterior wall length in meters
and ensure the demand value detailed for that bracing line is achieved.
A warning note will be visible if the demand is not achieved.
Print Sheet
The Print Sheet automatically stores data from the Main Menu and
each of the Along and Across sheets to provide a print version of the
bracing calculations. Once the calculations have been completed go to
the Print Sheet to print off the information.
House Type
Achieved Sheets to use
Single level on concrete
Upper along/across
Two levels on concrete
Lower along/across & Upper along/across
Single level on timber floor
Subfloor along/across & Upper along/across
Two level on timber floor
Subfloor along/across, Lower along/across & Upper along/across
11.1 Gamma Bracing Software - Achieved
Achieved Sheet
PRINT SHEET
The Print Sheet automatically stores data from the Main Menu and each of the Along and Across sheets to provide a print
version of the bracing calculations. Once the calculations have been completed go to the Print Sheet to print off the information.
Gamma bracing solution V1
TABLE 1
TABLE 2
House Type Achieved Sheets to use
Single level on concrete Upper along/across
Two levels on concrete Lower along/across & Upper along/across
Single level on timber oor Suboor along/across & Upper along/across
Two levels on timber oor Suboor along/across, Lower along/across & Upper along/across

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5.0 Installation Procedure
TABLE 3
GAMMA INSTALLATION PROCEDURE
1 Once the positions of the Gamma Bracing Frames (GBF’s) have been determined from the bracing design remove any cross
noggins/dwangs where the GBF’s are to be installed. Ensure the inside dimension of the framing provides a suitable t for the
GBF’s. A tolerance of +2.0mm and – 0.0mm between the GBF and the timber framing is acceptable. The GBF’s s need to t snuggly
into the framing.
2 For wall heights of 2.7m and 3.0m install the required timber framing members as detailed.
3Concrete Floors – External & Internal Walls
Where GBF’s are located in external walls position the GBF’s ush with the inside face of the timber framing to ensure the hold
down fastener is away from the edge of the concrete slab (minimum edge distance = 60mm). For internal walls the GBF’s can be
positioned centrally within the framing.
Timber Floors – External & Internal Walls
Where GBF’s are located in external walls and internal walls the GBF’s can be positioned anywhere within the framing ensuring
the position of the hold down bolt is secured in to solid timber framing.
Once the GBF’s are positioned mark the positions for the hold down fasteners through the slot in the hold down bracket and on
to the bottom plate. Remove the GBF or where possible swing the GBF to one side to allow access for drilling the holes for the
hold down fasteners. To swing the GBF to one side it is useful to install a single Tek screw fastener into each stud (do not fully
tighten these until the GBF is fully installed). Drill the holes for the hold down fasteners.
4Concrete Floors – Hold Down Anchors
Use M12 x 150mm masonry fasteners or M10 x 140mm Masonry Screw in Anchors (Refer Section 16.2 for recommended types of
anchor).
Timber Floors – Hold Down Anchors
Use M12 x 200mm galvanized coach screw to be fastened into solid timber framing (Refer Section 16.2 for recommended types
of anchor).
5 Reposition the GBF in between the studs ensuring that the slotted holes in the brackets are aligned with holes in the bottom
plate.
6 Install the slotted washer provided and install the hold down anchor and tighten.
7 Each of the hold-down brackets are secured to the GBF framing to allow for shipping and have been pre drilled with 8 holes.
Using the 12g x 40mm Tek screws fasten each bracket to the timber framing (8 screws per bracket).
It is permitted to adjust the brackets up to no greater than 50.0mm and down by no greater than 39mm to allow for any small
deviation in wall framing height. (Refer section 15.8 for further details on height adjustment).
8 Using 12g x 40mm Tek screws provided x through the pre punched holes located in the GBF’s and into the timber framing.
9 If thermal insulation is to be installed then cut the thermal insulation to t within the timber framing and Gamma framing
members and ensure that insulation protrudes from both sides of the Gamma Bracing Frame (Refer Section 16.3).
10 If interior sheet linings are to be installed x as per the manufactures instructions or as per AS/NZS 2589:2017. Minimum drywall
xing centres to be no greater than 300mm.
Detailed within Table 3 is the procedure for installing the Gamma Bracing Frames (GBF’s). The installation procedure is
designed for onsite installations however the GBF’s can also be installed at the pre nail framing stage of the construction.
Should the GBF’s be installed at the pre stage the GBF’s will have temporary fasteners installed to hold them in place for
the purpose of transportation to the job site. Completion of the installation of the GBF’s must be carried out once the pre
nail framing has been erected using the same procedures as detailed within Table 3.

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5.0 Installation Procedure
If receiving the framing from the Pre nail manufacture with the Gamma Bracing
Frames pre-installed there will be 4, 12g x 40mm Tek screws securing the Gamma
Bracing Frame within the timber framing. 2 screws positioned at the upper part of
the Gamma Bracing Frame and 1 screw in each of the brackets. Mark the position of
the hold down bolt hole on to the timber base plate for each bracket.
When installing Gamma Bracing Frame directly on site position the Gamma Bracing
Frame within the timber framing and mark the timber base plate as previously
described.
Please note: Observe edge distance requirements for external walls on concrete
floors.
Remove the 2 screws from the brackets only to allow the Gamma Bracing Frame to
be swung to one side to allow access for drilling the holes for the hold down bolts.
Drill holes for the hold down bolts for each bracket. Ensure correct size drill bit is
used and the correct depth of the hole is achieved.
Reposition the Gamma Bracing Frame within the framing.
Install the 2 washers provided, 1 for each bracket.
Position the hold down bolts in each bracket, 2 per Gamma Bracing Frame
(not provided).
Refer to Section 16.2, Table 4 to when choosing the correct hold down bolt.
1
2
3
4
5

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5.0 Installation Procedure
Install the hold down bolts to secure Gamma Bracing Frame to the substrate. A
socket drive extension can be positioned through the access hole in the lower
trellis to enable the hold down bolt to be tightened.
Fully tighten the hold down bolts
Install the 12g x 40mm Tek screws in each Bracket. (Provided)
Quantity of 8 screws per bracket. (Provided)
Install the 12g x 40mm Tek screws to the Gamma Bracing Frame. Pre punched
holes are positioned in the up-right sections and the top end cap of the Gamma
Bracing Frame provided.
The Gamma Bracing Frame is now fully installed and providing its structural
performance.
6
7
8
9
10

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6.0 Gamma Bracing Frame GBF220S
2010 (+/-1mm)
Hold Down Brackets & Washers
Detailed in the drawing below is the Gamma Bracing Frame GBF220S as it is supplied

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6.1 Gamma Bracing System Construction GBF220S
Performance - Wind 45BU - Earthquake 53BU
Note: The outer stud can be
used as a lintel support stud.
Detailed in the drawing below is the GBF220S as it must be constructed to provide the described wind and earthquake
performance values.
GBF220S (Wall Height 2.1m)
2.1m
Inner Stud Centres
400mm
265mm
Wall length

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PROOF
7.0 Gamma Bracing Frame GBF220
66 mm
Detailed in the drawing below is the GBF220 as it is supplied.

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PROOF
7.1 Gamma Bracing System Construction GBF220
Performance - Wind 37BU - Earthquake 44BU
Note: The outer stud can be
used as a lintel support stud.
GBF220 (Wall Height 2.4m)
2.4m
Detailed in the drawing below is the GBF220 as it must be constructed to provide the described wind and earthquake
performance values.
Inner Stud Centres
400mm
265mm
Wall length

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8.0 Gamma Bracing Frame GBF400S
Detailed in the drawing below is the GBF400S as it is supplied.
2010 (+/- 1.0mm)

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PROOF
8.1 Gamma Bracing System Construction GBF400S
Detailed in the drawing below is the GBF400S as it must be constructed to provide the described wind and earthquake
performance values.
Performance - Wind 51BU - Earthquake 63BU
GBF400S (Wall Height 2.1m)
Stud Centres
445mm
400mm
Wall length

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9.0 Gamma Bracing Frame GBF400
2310mm (+/- 1.0mm)
353mm (+/- 1.0mm)
66 mm
LH Side Channel
RH Side Channel
Horizontal Channel
Angled Channel
Lower Angled Channel
45 mm
Hold Down Brackets
Tek Screw
Positions
Service
Holes
Gamma Bracing Frame GBF 400
Detailed in the drawing below is the GBF400 as it is supplied.

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PROOF
9.1 Gamma Bracing System Construction GBF400
Detailed in the drawing below is the GBF400 as it must be constructed to provide the described wind and earthquake
performance values.
Performance - Wind 45BU - Earthquake 55BU
GBF400 (Wall Height 2.4m)
445mm
2400mm
400mm
Stud Centres
Wall length