LVL beams in Australian construction: stress grades, sizing, and manufacturer span tables

TL;DR

Laminated Veneer Lumber (LVL) is the go-to engineered timber for any structural member that solid Radiata Pine can’t comfortably reach: lintels over 2.4 m openings, ridge beams, suspended floor joists, garage door headers, and the lower flange of I-joist floor systems. It is used the same way across Class 1a houses, Class 2 low-rise apartments, and Class 3-9 commercial timber framing (mid-rise mass-timber construction excepted). LVL is excluded from the AS 1684 span tables: every LVL beam is sized from the manufacturer’s own certified span table for the specific product (Wesbeam Futurebuild, Tilling SmartLVL, Carter Holt Harvey hySPAN, etc.), or from the engineer’s design under AS 1720.1. The Australian LVL market is small in manufacturer terms: Wesbeam is the only domestic manufacturer, the other major brands (hySPAN, SmartLVL) are imported veneer/laminated locally. Common stress grades are F17 (general use), F22 (premium), and F27 (high-strength specialty). The three biggest job-killers: sizing LVL off an AS 1684 table (under-strength), exposing LVL to weather without H2 or H3 preservative treatment (rot inside two seasons), and over-drilling for services (the parallel veneer grain has no cross-grain to resist split propagation around a bored hole).

What it is

LVL is an engineered timber product made by rotary-peeling logs into thin veneers (3 mm typical), drying them, then bonding them under heat and pressure with phenolic or urea-formaldehyde adhesive with all veneer grain aligned parallel to the long axis. The result is a uniform, high-strength rectangular section with predictable structural properties and no natural defects (knots, splits, slope of grain) because every veneer is graded and laid up to specification.

LVL differs from glulam (glued-laminated timber, where solid timber lamellae are stacked with grain parallel but each lamella is a discrete piece), from CLT (cross-laminated timber, where grain alternates between layers for two-way action), and from solid sawn timber (no engineering of the cross-section). The all-parallel veneer construction makes LVL strongest along its length, like sawn timber but more uniform; it is correspondingly weak in cross-grain bending.

The Australian and New Zealand standard governing LVL manufacture is AS/NZS 4357.0:2022 (verified 2026-05-13, Standards Australia). It sets out the veneer quality, adhesive bond, dimensional tolerance, moisture content, and structural verification requirements that every product carrying a “structural LVL” label must meet.

Stress grades and properties

LVL is graded by the F-stress system used for structural timber under AS 1720.1. The F-grade is the characteristic bending stress at the extreme fibre in MPa.

Grade	Characteristic bending stress (f’b, MPa)	Typical use
F11	11	Light-duty applications, rare in beams
F14	14	Light-duty lintels, joists in shorter spans
F17	17	The default for lintels and floor joists in most Wesbeam and CHH ranges
F22	22	Premium grade: longer spans, heavier loads, lintels above 3 m or with first-floor load over
F27	27	High-strength specialty: ridge beams under heavy roof loads, long-span open-plan beams

Some manufacturers publish their own product designations that map to the F-grades:

Wesbeam Futurebuild LVL: F17 and F22 grades in the general construction range
Tilling SmartLVL 13 (F22-equivalent), SmartLVL 15 (F27-equivalent, one of the strongest mass-produced LVL grades in the Australian market, verified 2026-05-13 Tilling SmartLVL 15)
Carter Holt Harvey hySPAN (F17 to F22 range)

The number after “SmartLVL” is the manufacturer’s own designation, not an F-grade. Always check the data sheet for the AS 1720.1 mapping when comparing across brands.

Other published properties beyond bending strength include modulus of elasticity (E, ~14,000 MPa for F17 LVL), shear strength, and characteristic tension capacity. For routine lintels and joists the F-grade and the span table cover the practical selection; the deeper properties matter for engineered design.

Standard sections

Wesbeam, Tilling, and CHH publish broadly comparable section sizes. The standard Australian range:

Width (mm)	Depths available (mm)	Where used
35	130, 170, 200, 240, 300, 360	Single LVL lintels, joist bays in 600 mm centres
45	130, 170, 200, 240, 300, 360, 400, 450	Most lintels and floor joists
63	200, 240, 300, 360, 400, 450	Heavier lintels, ridge beams, garage door headers
75, 90, 130	300, 360, 400, 450, 500, 600	Engineer-specified for heavy loads, long spans, Class 2 to 9 framing

Tighter or wider sections than the standard range are made to order with extended lead times. Multi-ply lintels (two or three 45 mm sections bolted together) are routine where the standard depth doesn’t reach the load or the architect’s preference is for a deeper, narrower beam.

Where LVL is the right call

Lintels over openings wider than 2.4 m: an F17 200 mm LVL handles most single-storey 2.7 m openings with first-floor framing over. Above 3 m wide or with two-storey load over, jump to F22 or move to a double-ply.

Ridge beams on cathedral ceilings and skillion roofs: where the ridge can’t be supported by an internal wall and must span an open room, an LVL ridge beam transferring load to end walls is the standard solution.

Floor joists in suspended floor systems: I-joists with LVL flanges (the joist’s top and bottom layers) and OSB or plywood webs are the volume-builder default for upper-floor systems. Examples: Wesbeam I-Joists, Tilling SmartJoist, CHH hyJOIST.

Garage door headers: the typical 5 to 6 m garage door span needs a deep LVL section (often 300 to 400 mm deep in 63 mm or doubled 45 mm width) carrying both garage roof and any first-floor load over.

Bearers under suspended floors on stumps or piers: where the bearer spans need to reach 3 to 4 m between stumps without intermediate support.

Where LVL is wrong

Exterior weather exposure without treatment: untreated LVL absorbs water at the veneer ends and the glue lines, swelling, delaminating, and rotting within a couple of seasons. Use H2-treated for protected internal in-ground hazard or H3-treated for above-ground external exposure, and seal any cut ends with end-grain sealer.
High fire-rated assemblies: LVL has lower charring resistance than solid hardwood; FRL-rated walls and floors typically require timber-clad steel or specifically tested LVL assemblies.
Spans the manufacturer’s table won’t reach: do not extrapolate the span table; either move up in size, jump to a higher grade, or hand the design to a structural engineer for AS 1720.1 calculation.
In tension perpendicular to grain: LVL is weak across the veneer grain. Hangers, bolt patterns, and notch geometry must respect the grain direction.

Sizing: span tables vs engineer’s design

Two valid sizing paths:

Manufacturer’s certified span table: every major LVL brand publishes span tables for their product range covering common cases (floor joists at standard centres, lintels under typical roof and floor loads). Read the table for the product, the load case, and the support condition. The table is the legal basis for selection where the application fits within the table’s load assumptions.
Structural engineer’s design under AS 1720.1: required where the application sits outside the published table, where multiple loads combine (lintel under both first-floor and roof), where the support condition is unusual (cantilever, simply supported with axial tension), or where the certifier asks for engineered details.

AS 1684 span tables explicitly exclude LVL. Using an AS 1684 timber span table to size an LVL beam is non-compliant and routinely produces an under-strength selection because the AS 1684 grade assumptions don’t map to LVL properties (verified 2026-05-13 via glossary/LVL entry confirmation).

Connections

LVL connects to surrounding framing via bolts, coach screws, proprietary structural screws, and joist hangers:

Bolts through LVL: full bolt diameter, no nail-into-LVL substitution. Bolt edge distance per AS 1720.1 to avoid split propagation.
Joist hangers: galvanised steel hangers like Pryda Triple Grip or Multinail Joist Hanger, sized to the LVL width and depth. Hangers must be nailed off with the full nail count specified by the hanger manufacturer.
Structural screws: SPAX, ASSY, and equivalents in 6 to 10 mm shank are routinely used for LVL-to-LVL and LVL-to-top-plate fixings where bolts are awkward. Always use the screw manufacturer’s withdrawal and shear capacity, not generic timber screw figures.
Multi-ply fastening: two or three 45 mm LVL beams bolted as a multi-ply unit need fixing per the LVL manufacturer’s multi-ply detail (typically 12 mm bolts at 600 mm centres with hex-head bolt and washer both faces).

Common defects and site issues

Cuts and over-drilling for services: a 50 mm hole drilled mid-depth in a 200 mm LVL beam reduces the section’s bending capacity materially. Manufacturer detail sheets give “allowable hole” zones; outside that zone, the engineer’s review is required.
End-grain water absorption: an LVL beam stored on a wet pad or sitting in the rain at frame stage soaks water in at the cut ends. The veneer swells and delaminates locally; the beam should be replaced rather than dried in place.
Multi-ply slip without bolts: two 45 mm LVL beams nail-laminated at the chippy’s discretion act as two single beams, not a 90 mm composite. Bolts at the manufacturer’s spacing are mandatory.
Span miscalculation across multiple loads: an LVL lintel handling roof load only is one calculation; the same lintel handling roof PLUS first-floor PLUS second-floor over is a different calculation. The certifier should check, but the builder should question if a single-load span table reading is being applied to a multi-load situation.
Wrong product on the order: SmartLVL 13 and SmartLVL 15 look identical on the truck but differ materially in bending capacity. Confirm the stamp on the side of each beam before fixing.
Joist hanger underspec’d: a 35 mm × 240 mm hanger nailed off with 4 nails where 8 are specified is a defect that often passes the inspection but fails under live load.

Pricing (2026 indicative, ex-GST, ex-Sydney metro yard)

Section (mm)	Grade	Per linear metre
45 × 200	F17	$30-45
45 × 240	F17	$35-55
45 × 300	F17	$50-75
45 × 300	F22	$70-110
63 × 300	F17	$70-95
63 × 360	F22	$110-160
75 × 400	F27	$200-260
Multi-ply lintel premium	(assembled by yard)	+$8-15/LM for hardware and assembly

Pricing varies materially by brand, season, and freight; volume-builder pricing through Big River or Bunnings Trade is typically 10 to 20% below merchant pricing. Long-lead specialty sections (75 mm + width, depths above 450 mm) require 4 to 8 week lead times.

Standards and references

Standards Australia, AS/NZS 4357.0:2022 Structural laminated veneer lumber. https://store.standards.org.au/product/as-nzs-4357-0-2022 (verified 2026-05-13).
Standards Australia, AS 1720.1:2010 Timber structures Part 1: Design methods. https://store.standards.org.au/product/as-1720-1-2010 (verified 2026-05-13).
Wesbeam, Wesbeam LVL and I-Joist product range (Australia’s only domestic LVL manufacturer). https://wesbeam.com/lvl-products (verified 2026-05-13).
Tilling, SmartLVL 15 product page. https://www.tilling.com.au/product/smartlvl-15/ (verified 2026-05-13).
Australian Building Codes Board, NCC 2022 ABCB Housing Provisions (timber structural provisions). https://ncc.abcb.gov.au/editions/ncc-2022/adopted/housing-provisions (verified 2026-05-13).