Performance. Strength. Appearance.
Preferred for its light colour in internal exposed situations Hyne Beam 18 creates a warmth and ambiance in these specific design applications. Also available as a structural grade, for applications where appearance is unimportant, Hyne Beam 18 is best suited for use as lintels or roof beams.
Builders use this Tasmanian Oak laminated beam with confidence for traditional building applications in both domestic dwellings and for commercial structures.
Architects, Designers and Engineers all understand the versatility of Hyne Beam 18 for use in similar applications as Hyne Beam 17, but where the hardwood properties of Hyne Beam 18 are most suited, particularly when a light coloured timber appearance is preferred.
Timber merchants, wall and roof truss manufacturers can source this made to order glulam beam as part of the Hyne ETP package through Hyne Wholesale.
Hyne Beam 18 is produced from renewable resources protecting our environment for future generations.
Main product application
Roof beams, bearers, lintels
Size, grades and tolerance
Stock length including increments:
Up to 15.6 m in 0.3m increments
Size range (mm):
|65||120, 155,185, 215, 245, 270, 300, 330, 360, 390, 420|
|85||120, 155,185, 215, 245, 270, 300, 330, 360, 390, 420, 450,480, 510, 540, 570, 600|
|130||120, 155,185, 215, 245, 270, 300, 330, 360, 390, 420, 450,480, 510, 540, 570, 600|
Tolerance on Section:
Thickness – 2mm
Hynebeam 18 is available as A Appearance and C Structural Grade (STR) as defined in AS1328.1.
Select Grade specified as (SEL)
This beam is equivalent to appearance Grade A: AS 1328.1 – 1998. This grade is intended for use in applications where appearance of the member is important and clear or painted finishes are used. All surface voids are therefore filled or repaired. Unless otherwise specified, the surfaces are sanded to a minimum 60 grit finish.
Structural Grade specified as (STR)
This beam is equivalent to appearance grade C: AS 1328.1 – 1998. This grade is intended for use in applications where appearance is not important. All blemishes and voids are acceptable.
The species used consists of visually graded Eucalyptus regnans, Eucalyptus delegatensis and Eucalyptus obliqua. This species mix is commonly known and traded as Tasmanian Oak.
Resorcinol based glues (PRF – Phenol Resorcinol Formaldehyde) are used which are suitable for Service Class 3.
Moisture content is the mass of moisture present in wood divided by the mass of the wood with no moisture in it, expressed as a percentage.
Moisture content range
The moisture content of Hynebeams has a range of between 8-15%.
The moisture content is uncorrected. Therefore moisture meters used to confirm the moisture content need be set to Douglas-fir and 20ºC which are the default setting for most moisture meters.
Treatment and Durability:
Untreated – as species cannot be treated.
Natural durability, lyctid susceptibility of sapwood and termite resistance of heartwood:
|Species||Lyctid susceptibility of sapwood||Natural Durability class of heartwood||Termite Resistance of Heartwood|
|In-ground contact||Outside above ground|
|Mountain (Eucalyptus regnans)and Alpine Ash (Eucalyptus delegatensis)||Not susceptible||4||3||Not Resistant|
|Messmate (Eucalyptus oblique)||Susceptible||3||3||Not Resistant|
Source: AS 5604-2005 (Incorporating Amendment No. 1) Timber-Natural durability ratings
Hynebeam 18 is not durable for weather exposed applications (Service Class 3) and is not termite resistant.
Service Class 1 – Service Class characterized by a moisture content in the materials corresponding to a temperature of 20ºC and relative humidity of the surrounding air only exceeding 65% for a few weeks per year.
Note: On Service Class 1 the average equilibrium moisture content in most glulam will not exceed 12%.
Service Class 2 – Service Class characterized by a moisture content in the materials corresponding to a temperature of 20ºC and relative humidity of the surrounding air only exceeding 85% for a few weeks per year.
Note: On Service Class 2 the average equilibrium moisture content in most glulam will not exceed 20%.
Service Class 3 – Service Class characterized by climatic conditions leading to higher moisture contents than Service Class 2, or where timber is directly exposed to sun and/or rain.
Note: Refer to additional technical Information sheet.
Source: AS/NZS1328.1 – 1998 Glued laminated structural timber – Performance requirements and minimum production requirements
Mechanical properties have been determined in limit state format form with a comprehensive testing and evaluation program carried out by Hyne. The modulus of rigidity is calculated by using G = E/15.
Density is a measured property and is determined as average seasoned density. However properties such as Bearing Strength Perpendicular to Grain, Bearing Strength Parallel to Grain, Shear Strength at Joints Details and Tension Strength Perpendicular to Grain are secondary properties which are depending on the strength group for the material and are determined in accordance with AS1720.1-2010. Further joint group are based on the material used and the groups are defined based on species and density as per AS1720.1-2010.
Values of capacity factor (F) for calculating the design capacity of (F Rd) of structural members:
|Structural Material||Application of structural member|
|Structural members for house for which failure would be unlikely to affect an area* greater than 25 m2;ORsecondary members in structures other than houses||Primary structural elements in structures other than housesORelements in houses for which failure would be likely to affect an area* greater than 25m2||Primary structural members in structures intended to fulfil an essential service or post disaster function|
|Values of capacity factor, F|
|Glue-laminated timber-AS/NZS 1328.1||0.95||0.85||0.75|
* In this context, area should be taken as the plan area.
Source: AS1720.1 – 2010 Timber structures Part 1: Design methods
Duration of load factor (j2) for creep deformation:
|Load Duration||Service Class/Exposure Classification|
|1 & 2||3||Severe/Adverse|
|Short Term ? 1 day||1.0||1.0||1.0|
|Long Term ? 1 year:Section width > 45mm||1.5||2.0||3.0*|
|Long Term ? 1 year:Section width ? 45mm||2.0||2.0||3|
Source: GLTAA Technical Data Sheet No.
3 Unified Design Criteria.
The engineering design data presented may be used for structural design of domestic, commercial and industrial applications in conjunction with:
- AS1684.1 – 1999 Residential timber-framed construction Part 1 Design Criteria
- AS1720.1 2010 – Timber Structures Part 1: Design methods
- GLTAA (Glued Laminated Timber Associated of Australia) Uniform Design Criteria,
and all other relevant standards (e.g. loading codes, wind codes, etc.).
For moisture contents below 25%, approximate thermal conductivity k across the grain can be calculated with a linear equation of the form
K = Gx(B + CX) + A
where Gx is specific gravity based on ovendry mass and volume at moisture content x (%) and A, B, and C are constants.
For Gx > 0.3, temperatures around 24 ºC, and x < 25% MC, the values of the constants are as follows:
A = 0.01864, B = 0.1941, C = 0.004064 (K in W m-1 K-1)
Source: Centennial Edition Wood Handbook Wood as an Engineering Material, Forest Product Laboratory, United States Department of Agriculture Forest Services, Madison Wisconsin, 2010.
Hynebeams with “C”
designates a Hynebeam with a vertical camber radius of curvature of 600mm. “S” designates a straight Hynebeam.
Alignment and tolerance of both straight and cambered beams shall be no more than 1mm per metre of length of beam.
Hyne Beams are generally supplied as cambered marked to identify the top edge of the beam. Unless specifically requested (such as for large cantilevers), this brand should not be installed facing downwards.
The below table displays the amount of camber versus beam length.
|Beam length (m)||2.4||2.7||3.0||3.3||3.6||3.9||4.2||4.5||4.8||5.1||5.4|
|Beam length (m)||5.7||6.0||6.3||6.6||6.9||7.2||7.5||7.8||8.1||8.4||8.7|
|Beam length (m)||9.0||9.3||9.6||9.9||10.2||10.5||10.8||11.1||11.4||11.7||12.0|
|Beam length (m)||12.3||12.6||12.9||13.2||13.5||13.8||14.1||14.4||14.7||15.0||15.3|
|Beam length (m)||15.6||15.9||16.2||16.5||16.8||17.1||17.4||17.7||18.0||18.3||18.6|
Hynebeams 18 have a lamination thickness of 31.5mm.
TAS/NZS 1328.1 – 1998 Glued laminated structural timber Part 1: Performance requirements and minimum production requirements
AS 5068 – 2006 Timber – Finger joints in structural products – Production requirements
AS1684.1-1999 Residential timber-framed construction – Design criteria
AS1720.1-2010 – Timber structures Part 1: Design methods
Third Party Information: