EGGER OS’Brace is a strong and durable, engineered wood panel with consistent structural properties. It resists splitting and delamination. It has a clean fresh wood appearance with none of the typical veneer defects of plywood such as holes, knots and splits.
Termite Resistance

EGGER OS'Brace products are suitable for use in buildings in internal, above ground, dry structural and non-structural applications. EGGER OS'Brace can be used in conjunction with other building materials and systems to resist termite action and it meets the performance requirements of the National Construction Code (NCC). Other materials and systems may include termite resistant materials other than EGGER OS'Brace and/or termite barrier systems.

Bracing Capacity

The racking resistance values for EGGER OS'Brace have been derived from independent testing of full scale prototype panels at the Faculty of Engineering and Physical Systems, Central Queensland University. The testing methods used have been developed over three decades by the CQU and have been calibrated to over 30 years of actual performance in buildings around Australia subjected to real wind forces.

Therefore the EGGER OS'Brace racking values published in the manual can be used with great confidence and have been independently certified by the Sydney University of Technology as complying with the requirements of the building code of Australia.

For wall heights exceeding 2.7m, bracing resistances detailed must be reduced proportionally, e.g. for a wall height of 3.3m, racking resistance reduction factor 2.7/3.3 = 0.82 minimum section (length of bracing) for system types 1, 2 and 3 is 900mm.

When used in the cavity of a brick veneer, brick wall ties must be of the face-fixed type complying with AS2699. The ties should be nailed through the EGGER OS'Brace to the face of the stud.

Design Scope
Where the building design or design wind speed parameters are outside the scope of AS1684-1999, a professional engineer should be consulted to determine the wind forces generated from AS4055-1992 or directly from AS1170.2-1989. 
Installation

EGGER OS'Brace should be installed in accordance with standard building design and construction methods. Prolonged exposure to moisture and excessive condensation must not occur.

EGGER OS'Brace is suitable for use in humid conditions where the panel in-service moisture content does not exceed 20%. This is defined in EN13986:2004 as service class 2. This service class is appropriate for the installation of EGGER OS'Brace within the cavity of a brick veneer building or under cladding throughout Australia.

EGGER OS'Brace is hygro-scopic, meaning that the panel’s final resting moisture content will adjust to the equilibrium moisture content (emc) of the site. Correct installation procedure must be observed to allow for the small dimensional movement in the EGGER OS'Brace panel in response to changes in emc.

EGGER OS'Brace should be allowed to acclimatise to the installation environment (pick up moisture) for at least a 48 hour period prior to installation.

Do not butt joint EGGER OS’Brace panels tightly. To allow for hygroscopic movement, a minimum 2 mm expansion gap must be allowed around the full perimeter of the panel and at any butt joint between EGGER OS’Brace panels.

Fasteners

For the EGGER OS'Brace systems detailed in the manual, 2.8mm diameter × 30mm flathead galvanised or corrosion resistant nails, or their gun-driven equivalent are specified according to AS1684-1999.

Fastener edge distances along top and bottom plates and edge studs should be a minimum of 15mm and 8mm where panels are fixed to internal framing. The table specifies the suitable fastening for EGGER OS'Brace complying with EWPA recommendations. The fastener spacing for staples has to be reduced to two thirds of the spacing of nails or screws by multiplying the nail or screw spacing with the factor 0.66.

Minimum Fastener Specification

HAND DRIVEN NAILS

2.8mm dia. × 30mm flathead structural clouts or connector nails

POWER DRIVEN NAILS

Senco Tn22-38 apb:
2.33mm dia. × 38mm flathead

Bostitch ac45p250-gW:
2.5mm dia. × 38mm flathead

Jambro b20998:
2.8mm dia. × 32mm, zinc plate barb

Duo-Fast c27.32gDTn22-38 apb:
2.7mm dia. × 32 mm dia. galvanised

POWER DRIVEN STAPLES

Senco n167 bab:
wire dia. 1.53mm, crown width 10.5mm

Bostitch bcs4-1232:
wire dia. 1.55, crown width 12mm

Jambro a10617 g5562-38 mm:
wire dia. 1.53mm, crown width 10.5mm

Fasteners

Fasteners with equivalent dimensions as above, i.e. head size and shape, shank diameter and length to those in the table are deemed acceptable.

All fasteners are to be galvanised or suitably coated.

If smaller diameter hand driven nails are used, the spacing of nails can be reduced in the ratio of the basic lateral loads per nail for JD4 joint group given in table 4.1 of AS1720.1 Timber structures – Design methods for the lower nail diameter relative to the tabulated load for a 2.8mm diameter nail.

Cutouts

As EGGER OS'Brace possesses similar shear carrying capacity to other sheet bracing materials, allowable holes through EGGER OS’Brace in size and distribution would be similar to these materials.

A hole 100 × 100mm maximum within an envelope of 100mm from top and vertical edges and 200mm of the bottom of the bracing panel will not significantly affect the bracing capacity. Multiple holes of this size are permitted provided the centre lines of the holes are not closer than 600mm.

Sawing

EGGER OS'Brace can be sawn and shaped in the same way as solid wood with standard stationary tools and (electrical) hand-held tools. Carbide tipped cutters are recommended. If panels are to be installed in a visible location, ensure clean-cut edges with sharp tools.

The feed rate should be somewhat slower than for solid wood. If hand-held equipment without suction removal is used, a protective face mask should be worn. 

Drilling

EGGER OS'Brace may be drilled with all electrical and hand-held tools suitable for solid wood.

Anchoring Bottom Plates

Anchoring of bottom plates shall be in accordance with AS1684-1999 or designed in accordance with AS1720.1-1997. Hold down provided in the EGGER OS’Brace bracing system provides bracing resistance. Additional fixings (cyclone rods) may be required to resist uplift forces and must be appropriately designed and installed. 

Lining Panel Usage

6mm EGGER OS’Brace is designed and manufactured specifically as a bracing panel.

It is not designed as lining panel. However, with suitable battening and design fixing, it may also perform well in this application. In general terms, a 12mm (or thicker) panel is recommended as a lining panel similar to plywood products. The extra thickness of 12mm maintains a flatter surface.

More Information
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