This guide walks through the most common sizes and thicknesses available, plus what they’re typically used for on Australian sites.
What is LVL formwork timber used for on Australian sites?
LVL formwork timber is commonly used to form and support concrete until it gains strength, including slabs, beams, columns, and walls. They choose it because LVL is engineered for consistency, predictable performance, and repeatable results across pours.
On many projects, it’s used as bearers, joists, walers, edge form components, and bracing, depending on the formwork system and engineer’s design.
What widths are most common for LVL formwork timber?
The most common widths for LVL formwork timber in Australia are typically around 45 mm, 63 mm, and 90 mm, depending on the product line and intended application. They’ll often see 45 mm used where compatibility with standard framing and accessories matters.
Wider sections are usually chosen when they need more bearing area, higher capacity, or better screw and nail holding for repeated assembly.
What thicknesses do they usually see in LVL formwork timber?
For LVL formwork timber, thickness is often discussed in terms of the member’s “depth” (its vertical dimension in use), but many suppliers also refer to standard section sizes. They’ll commonly find LVL members that are 45 mm thick (the narrower face) paired with a range of depths.
If they are selecting sheeting rather than members, thicknesses vary again, but most LVL formwork discussions on-site focus on beam-like sections rather than panel products.
What depths are typical for LVL bearers and joists?
Typical depths for bearer and joist-style LVL formwork timber are often in the range of 90 mm up to around 360 mm, with common steps such as 90, 120, 150, 180, 200, 240, 300, and 360 mm. They choose depth based on span, spacing, wet concrete loads, and how much deflection they can tolerate.
On suspended slabs, deeper LVL members are common where they want longer spans or fewer props, but the engineer’s design governs the final selection.
Which standard lengths are most available in Australia?
Most suppliers stock LVL formwork timber in common lengths such as 3.6 m, 4.8 m, 6.0 m, and sometimes 7.2 m, with availability varying by brand and state. They’ll often choose shorter lengths for tighter sites and easier manual handling.
Longer lengths reduce joins and can speed up installation, but they also increase weight and may require better handling plans to keep work safe and efficient.
What are the most common sizes they can order off the shelf?
Off-the-shelf LVL formwork timber commonly includes sections like 45 x 90, 45 x 120, 45 x 150, 45 x 180, and 45 x 240, plus heavier options such as 63 mm or 90 mm wide variants. They’ll see these sizes across many timber merchants and formwork suppliers because they suit typical spans and system layouts.
Stock ranges differ between metro and regional locations, so they usually confirm lead times if a project needs uncommon depths or higher volumes.
How do they choose between 45 mm, 63 mm, and 90 mm wide LVL?
They usually choose width based on connection requirements, bearing capacity, and durability under repeated fixing and stripping. A 45 mm wide LVL formwork timber member is commonly used for general applications and can suit many brackets, connectors, and accessories.
They may step up to 63 mm or 90 mm where they want stronger fixings, more tolerance for edge damage, or higher capacity in heavily loaded zones like beam sides, perimeter support, or high-prop-spacing layouts.
What LVL sizes suit slab formwork versus beam formwork?
For slab formwork, they often use LVL formwork timber as joists and bearers where depth is selected to manage span and deflection. Common slab setups use mid-range depths to keep handling practical while still meeting the engineer’s requirements.
For beam formwork, they tend to use deeper or wider LVL for sides and supports, particularly where concentrated loads occur at beam bottoms, drop panels, or where walers must resist hydrostatic pressure from fresh concrete.
What thickness and size is common for walers and strongbacks?
Walers and strongbacks need stiffness, straightness, and reliable fastening, so they often use deeper LVL formwork timber sections in the 150 mm to 300 mm depth range, depending on wall height and tie spacing. They select sizes to limit bowing and maintain wall alignment.
On higher walls or higher-pressure pours, they may increase depth, tighten spacing, or choose wider members to give fixings more bite and reduce the risk of splitting.
How does available thickness affect spans and prop spacing?
Greater depth generally increases stiffness, so thicker or deeper LVL formwork timber may allow longer spans or wider prop spacing, subject to appropriate design checks. They typically balance fewer props for faster installation and better access against heavier members that can increase handling effort and overall cost. LVL formwork beam sizing should therefore match the project’s structural requirements.
The controlling factors are wet concrete loads, construction live loads, spacing, and acceptable deflection. They should treat supplier tables as guidance and confirm final spacing through the formwork design and engineer sign-off.
What’s the difference between LVL members and LVL or plywood sheeting in formwork?
On many Australian sites, LVL formwork timber refers to structural members like joists, bearers, walers, and bracing components. Sheeting, on the other hand, is the face that touches concrete, usually formply (plywood) rather than LVL.
They’ll often use LVL to carry the load path and use formply to provide the concrete finish. Mixing these roles up can lead to poor performance or unnecessary cost, so it helps to specify members and sheeting separately.
How do they confirm sizes when brands label LVL differently?
They confirm actual section size, grade, and manufacturer literature because naming conventions can vary. One supplier’s “90 x 45” LVL formwork timber might be described by another using a different order or a branded series name.
They also check whether the stated size is the dressed size, the nominal size, and whether tolerances affect fit with formwork hardware like hangers, clamps, and props.
What tolerances and straightness should they expect from LVL?
LVL is made for consistency, so they can generally expect better straightness and fewer defects than many solid-sawn alternatives. That consistency is a key reason LVL formwork timber is widely used where line and level matter, such as wall forms and soffits.
Even so, they still inspect deliveries, store LVL flat and supported, and reject pieces with damage or moisture-related distortion before it impacts alignment.
What availability issues affect LVL sizes across Australian states?
Availability often depends on local distribution, project demand, and what each merchant keeps as core stock. Metro areas such as Sydney, Melbourne, Brisbane, Perth, and Adelaide typically carry a broader LVL formwork timber range than smaller regional centres.
If they need uncommon depths, long lengths, or large quantities, they should allow time for transfers or mill orders, especially during peak commercial building periods.
What should they ask a supplier before ordering LVL formwork timber?
They should ask what sizes are stocked, which lengths are standard, and whether they can cut to length or supply pre-cut packs. For LVL formwork timber, they also confirm grade, treatment status if relevant, and whether product data supports the intended load case.
They’ll also want clarity on straightness, handling recommendations, and any restrictions on re-use, edge sealing, or exposure, particularly if the material will sit on-site through wet weather.
How do they select the “right” LVL size without overpaying?
They select the smallest LVL formwork timber section that meets design loads and deflection limits, then validate it against the practical realities of handling and installation speed. Oversizing can add cost and slow the crew, while undersizing can increase props, create bounce, or risk non-compliance.
In practice, they coordinate early with the formwork designer, confirm supplier availability, and standardise sizes across the job where possible to reduce waste and simplify set-out.
What’s a simple sizing checklist they can use before purchase?
They can make the selection process easier by checking a few essentials upfront. For LVL formwork timber, they should confirm the pour type, required spans, support spacing, and compatible system hardware before matching those requirements with products readily available in the Australian market.
A simple checklist they can use:
- Pour type: slab, beam, wall, or combo
- Span and spacing: bearer and joist layout
- Member role: joist, bearer, waler, strongback, brace
- Stock sizes and lengths: what’s available locally
- Handling limits: weight and site access
- Design approval: engineer or formwork designer sign-off
FAQs (Frequently Asked Questions)
What is LVL formwork timber used for on Australian construction sites?
LVL formwork timber is primarily used to form and support concrete elements such as slabs, beams, columns, and walls until the concrete gains sufficient strength. It is chosen for its engineered consistency, predictable performance, and repeatable results across multiple pours. Common applications include bearers, joists, walers, edge form components, and bracing depending on the formwork system and engineer’s design.
What are the most common widths available for LVL formwork timber in Australia?
The most typical widths for LVL formwork timber in Australia are around 45 mm, 63 mm, and 90 mm. The 45 mm width is often selected for compatibility with standard framing accessories, while wider sections like 63 mm and 90 mm provide greater bearing area, higher load capacity, and improved screw and nail holding for repeated assembly.
What thicknesses and depths are standard for LVL formwork timber members?
Thickness in LVL formwork timber usually refers to the member’s narrower face, commonly around 45 mm thick. Depths vary widely based on application needs, ranging typically from 90 mm up to about 360 mm with standard increments such as 90, 120, 150, 180, 200, 240, 300, and 360 mm. Depth selection depends on span length, spacing of props or supports, wet concrete loads, and allowable deflection limits.
Which standard lengths of LVL formwork timber are readily available in Australia?
LVL formwork timber is commonly stocked in lengths of 3.6 m, 4.8 m, 6.0 m, and occasionally up to 7.2 m depending on brand and regional availability. Shorter lengths facilitate easier manual handling on tight sites while longer lengths reduce joins and can speed up installation but require careful handling due to increased weight.
How do builders choose between different LVL widths like 45 mm, 63 mm, and 90 mm?
Selection of LVL width depends on connection requirements, bearing area needed under loads, and durability against repeated fixing and stripping cycles. A 45 mm wide member suits general use with standard brackets; wider options like 63 mm or 90 mm are preferred where stronger fixings are necessary or where higher load capacity is required such as beam sides or perimeter supports.
What sizes of LVL formwork timber are typically used for walers and strongbacks?
Walers and strongbacks generally require stiff and straight members with reliable fastening surfaces. Therefore, deeper LVL sections ranging from about 150 mm to 300 mm depth are commonly used depending on wall height and tie spacing. In high-pressure pours or taller walls they may increase member depth or width to reduce bowing risks and ensure structural alignment.
