Introduction The Gamma Bracing System

Gamma bracing system is a light weight steel, structural truss bracing frame that fits INSIDE the timber studs and between the top and bottom plates. And is designed to provide structural bracing performance for timber framed constructions

Gamma bracing frames are ideally suited for New or Existing constructions or the refurbishment of existing buildings that have suffered trauma & Leaky Building syndrome.

Gamma Testing Gamma bracing frames have been fully tested and accordance with

NZS3604: 2011 P21[2010] Racking Test method for use in New Zealand

Gamma Certification

Independent Structural Engineer to review testing.

Can also provide expert technical support .

Structural design work

Gamma Certification Followed a very rigorous process to obtain CodeMark Certification.

Gamma Technical Literature

Gamma Technical Installation Manual.

Details how to install

Performance details

Details required components

Hold Down requirements

Gamma PerformanceGamma system Reference Wind (BU’s) Earthquake (BU’s)

GBF400/2.4 45 45

GBF400/2.7 40 40

GBF400/3.0 35 40

GBF535G/2.4 69 75

GBF600/2.4 80 90

GBF600/2.7 70 70

GBF600/3.0 55 60

Gamma Performance

Gamma bracing frames provide up to 80BU for wind (130BU/m) Gamma bracing frames provide up to 90BU for earthquake (150BU/m)

Gamma Software Calculator

Gamma bracing calculator software available from the Gamma web site www.gammabracing.co.nz

Calculates Demand and Achieved

The Gamma Bracing software is flexible and allows the user to include other bracing products and systems.

Archicad Architectural design software available

Gamma Installation Establish the position of the Gamma

frames within the building.

Can be installed at Pre-nail frame stage.

Directly onsite

Can be installed from the outside when the cladding is removed.

Or from the inside when the lining is removed.

In wet areas (bathrooms etc)

Gamma frames are 45mm in depth leaving space for cross noggins

Gamma Installation

Mark hole positions on bottom plate and drill through into floor to the required depth. Then fit the Gamma frame.

Place the washer over the bracket.

Ensure the holes are free from debris and insert the Masonry screw.

Gamma InstallationInsert the impact socket extension drive through the access hole in the lower part of the frame and impact drive the bolt into the concrete.

Gamma Installation

Gamma Hold-Down Anchor Requirements

Hold-down Anchors Floor Type Wall Type Anchor Type Uplift Capacity

Concrete External Wall

Masonry Screw

15kN Chemical Set Anchor

‘J” Bolt set into concrete

Concrete Internal Wall

Masonry Screw

15kNChemical Set Anchor

Expansion bolt

Timber External/Internal M12 x 200mm Coach Screws

12kN

Gamma Installation (Concrete Floors)

For external walls on concrete floors position the Gamma frame flush with the inside face of the timber framing to achieve the maximum edge distance for the Hold-Down anchor. (Min Edge distance 60mm).

For internal walls the Gamma frames can be positioned anywhere within the framing

Gamma Installation (Timber Floors)

For external walls on timber floors position the Gamma frame to ensure that the Hold-Down anchors are fastened into solid blocking.

Gamma Installation - Insulation

Install insulation to all cavities within the Gamma frame

No issue with thermal loss or conductivity (Gamma frames are 45mm in depth)

Pre cut installation packs are available from most insulation suppliers

Bradford Styrobeck EcoFleece Expol Pink Batts

Gamma frames deliver the specific engineering bracing units to the structure immediately they are installed.

Gamma bracing frames can be used in conjunction with other bracing systems

Gamma frames have service access holes pre punched.

Any modifications to the Gamma frame are not permitted

Installation diagram provided with each frame along with fixing screws & washers.

Install the interior linings as per AS/NZS 2589. No plasterboard bracing fixing patterns are required

Timber moisture levels do NOT need to be less than 18% before Gamma fames are installed. This allows early structural integrity to the building.

Installation of Gamma Frames

Gamma bracing frames can accommodate stud centers of 400, 450 & 600mm & various stud heights using timber blocking.

Installation of Gamma Frames

Installation of Gamma Frames GBF535G/2.4 – Gamma GBF400 frame with double studs either

side.

New building code requirements require LBP to install structural bracing elements.

GAMMA bracing systems are flexible for designers and easily incorporated into the building design.

GAMMA’S are permanent structural members not easily destroyed with DIY projects.

Installation of Gamma Frames

Gamma – Outstanding Performance Gamma bracing frames provide a highly ductile and robust structural

bracing system and will continue to provide structural service post event allowing dwellings to be re-habitable.

The Gamma bracing frame maintains increased performances even when taken well past the recommended test deflection limits in the P21 [2010] test procedure.

Gamma bracing frame withstood multiple consecutive P21 Racking tests with only a very minimal drop of in performance compared with the first test. This proved that the Gamma is extremely robust and durable.

Gamma – Key Build Cost Savings Pre-Nail installation requires the Gamma frame to be simply dropped

in between the studs and 4 x Hex head screws installed.

Installing Gamma bracing frames is easy and cost effective

No requirement for temporary bracing (Labour & Material)

No Structural Plywood or Plasterboard Bracing lining boards required.

Bracing completed once framing is erected and Gamma frame installation is completed.

No post line Council inspection required.

Installation of the interior linings quicker, easier and can be carried out once the build is fully enclosed.

Reduced issues with plasterboard joint peaking and fastener popping.

Thank You