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Overview
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Technical Info
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Downloads
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Notes
Steel Stud and Track
Rollformers 2000 Ltd provide rollformed galvanised steel stud and track to meet the requirements of the building industry for lightweight, strong and versatile steel wall framing. All studs are manufactured in accordance with NZS/AS 1397-1993 and are able to be used in fire and sound rated situations up to a height of 7.2 meters. Please refer fire rated stud section for relavant information.
Rollformers steel stud and track are intended for use in the construction of non-load bearing walls, both interior and exterior. It is crucial to the performance of the product that the loads applied do not exceed the capabilities of the product.
To avoid excessive wall movement or plaster cracking do not exceed the deflection limits given in AS/NZS 1170
Studs
For requirements over and above this please contact Rollformers technical department. Rollformers manufacture stud in nominal widths of
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51mm
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63.5mm
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75mm
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89mm
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150mm
The following BMT is produced as standard
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55 bmt
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0.75 bmt
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0.95 bmt
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1.15 bmt
Please note 1.15 can only be acheived in 89mm stud and above only.
All studs have a 34mm face width . Both faces of the stud have a knurled finish, which will will assist in the installation of the product by resisting screw slipage and providing additional holding power . Stock lengths as listed below are availble now for non standard or special requirements contact the team at Rollformers now.
Track
Steel stud track sections provide a friction fit for studs when installed in the tracks. This serves to hold the studs in position untill the appropiate lining board is installed, but in addition provides a slip joint to allow movement in the structure. Note: Lining board should not be screwed to the track for this reason unless specified by consulting engineers.
Standard Track - Nominal 32mm Flange
Deflection Head Track - which has a 50mm Flange
General steel stud installation where walls are lined both sides standard tracks will be fit for purpose. Where the consulting engineer has indicated the use of a deflection head track a typical application for this track would be under a concrete slab or where the wall height exceeds 4800mm. There are no specific requirements for isolation of track sections from the concrete slabs unless specifically stated.
Track sections are standard lengths of 3000mm and should be fixed at intervals of no greater than 600mm centres. Initial fixings should be placed within 100mm of either end of the track section.
Steel Stud and Track
The design tables and material properties including any test data contained in Rollformers brochure have been formulated with the following New Zealand and International standards:
TECHNICAL INFORMATION
1. B1 Structural
2. B2 Durability
3. E3 Internal Moisture
4. F2 Hazardous building materials
5. G6 Airborne and Impact sound
6. G9 Electricity
7. G10 Piped Services
8. G12 Water Supplies
9. H1 Energy Efficiency
Please note when designing internal or external load bearing walls you should contact the Rollformers technical department for advice on suitable steel stud sizing and other related information pertaining to safe working loads and heights.
Exposure
Low (0.53kPa) / Medium (0.71kPa) / High (1.00kPa) / V High (1.30kPa)
STUD SIZE Studs at 400mm centres with a minimum of one layer of 10mm Gib plasterboard each side
63/.55 BMT 2.40(3.55) 2.40 (3.20) 2.40 (2.85) 2.40 (2.60)
Face loading and soft body testing combined with the respective deflection criteria, has resulted in sufficient strength and wall stiffness comparible to a traditional timber wall. The table above is derived from external wind exposure categories in accordance with
1170 using and internal differential pressure coefficient equal to 0.6. Wind pressures are listed in each category for ease of use with NZS 4205:1992
Stud heights in brackets may apply where soft body impact loads are not applicable.
Special consideration to design must be given where heavy loads are suspended from walls.
63/.55 BMT 2.55 (3.35) 2.55 (3.05) 2.55 (2.70) 2.50
89/.55 BMT 4.60 4.25 3.75 3.25
Steel Stud and Track
Downloads
Steel stud and track pdf (2.4 Mb)
RF Steel and stud fire rating doc (416 Kb)
Steel Stud and Track
Installation
Track
Top and bottom track should be fixed at 600mm centres. When fixing directly to concrete a waterproof membrane should be used.
Recommended Fasteners:
Into Concrete: M4.5 dynabolts, or 2.4 dia x 32 penetration Ramset powder actuated fasteners (provided distance to edge is not less than 75mm), or other suitable fasteners with a working load shear capacity of 0.75KN.
Into Steel: Self tapping screw 6 gauge/20 threads per inch, or other suitable with a working load shear capacity of 0.75kN
Into Timber: Self tapping screw type 17 screw, size number 8 for unseasoned hardwood or seasoned softwood, or other suitable with a working load shear capacity of 0.75 Kn
For fixing into concrete at a slab edge, it is essential to observe the fasteners manufactures stated edge distance limitations.
Additional Requirements
External walls required to resist uplift may require special fastners, specified by building designers
For fire rated walls, caulk any gaps between the tracks and surface irregularities
Studs
Cut studs 6mm shorter than floor to ceiling height to allow for height variations and for expansion. Screw fix the first and last studs of each wall panel to the top and bottom track. Insert the intermediate studs into the floor and ceiling tracks, which, which have tapered flanges for a friction fit. Space studs at centers specified, set plumb and square, and twist into position. If possible, the open side of the stud should face the direction from which the plasterboard installation is begun.
Additional Requirements
For fire rated walls and where the structural engineer specifies a deflection head, cut studs 20mm shorter than floor to ceiling height. For fire rated walls DO NOT screw, rivet, clinch, or otherwise mechanically fasten ANY studs to ANY tracks.
For load bearing walls, screw ALL studs to tracks, as specified by the building designer.
Deflection Heads
Required where specified by the structural engineer, replacing top track. Installation is as for standard top track. DO NOT screw end or any studs to the deflection head track.
Special Installation Requirements
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Installation of track, stud, and plasterboard is as for walls generally, except as described herein
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Caulk any gaps between the tracks and surface irregularities above and below .
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For /120/120 and /90/90 walls cut studs 20mm shorter than clear floor to ceiling height, to ensure a minimum gap of 15mm at the top of the stud.
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All stud / track connections must be restricted to friction fit. Do not screw, rivet, clinch, weld or otherwise mechanically fasten any stud to tracks .
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Plasterboard in single layer systems must be fixed vertically. Ensure that joins on opposite sides of the wall and in multiple layers do not fall the same stud.
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On the second side of the wall, cut and fix the plasterboard so the joints will be staggered on the alternate studs from the joints on the first side.
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Any horizontal joins in vertically fixed sheets (i.e. in high walls) must be backed by a continuous nogging and screwed at 200mm each sheet, staggered across the joint.
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For two layered systems, cut and fix the second layer so that second layer joints fall on the different studs the first layer.
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Where a deflection head is specified , plasterboard sheets must be cut to allow a 20mm gap at the top.
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Any gaps at the top of the plasterboard sheet must be filled on both sides with fire grade mastic.
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Plasterboard must not be screwed to floor or ceiling tracks or deflection heads .
Product, Handling, Storage, Maintenance & Installation
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Product should be kept as dry as possible in both storage and transit.
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Storage must be clear of ground, covers should be used. If product gets wet it should be leaned upright to allow drainage and then re-stacked to allow air to flow through to the dry product properly. Failure to do this can lead to corrosion forming on the surface of the product.
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Proper care must be taken to ensure the product is not damaged during the transportation, storage or installation processes.
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No product should be installed in areas where it is in prolonged contact with moisture.
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Product should not be used for which it is not designed for and that which exceeds capabilities of said products.
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All bracing must be correctly and completely installed prior to any loads are placed on said structures.
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Gas cutting of holes or welded additions are not recommended as each may cause an unacceptable loss of strength to the product.
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Keep surfaces as clean and free of debris and moisture as possible.
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If possible, inspect the stud and track when in storage for corrosion. If corrosion is visible wipe down and stack so product can dry.
Usage outside the stipulated guidelines
If there is a requirement for the use of Rollformers stud and track outside the stated limitations and or procedures given in this or any other literature you must contact the Rollformers 2000 Ltd before proceeding with the specific project.
For further information on the range of different and versatile products that Rollformers 2000 manufacture please do not hesitate to give any one of the sales team a call.