Repair Systems — 03 — Facade & External Envelope
Prestressed precast concrete lintel
Supplier reference for prestressed precast concrete lintels for long-span masonry openings on Class 2 strata buildings. Covers Stresscrete and specialist prestress fabricators — used for garage door openings, wide commercial openings, and long-span masonry zones where a reinforced section requires impractical depth. Engineer-specified prestress level and camber confirmation is mandatory. Cannot be stored inverted.
What is a prestressed precast concrete lintel?
A prestressed precast concrete lintel uses high-tensile steel strand placed in tension before the concrete is cast — the prestress force introduces a permanent compressive stress in the concrete that counteracts the tensile stresses from loading. This allows a prestressed lintel to achieve greater span or carry higher loads than a reinforced section of the same depth, and results in reduced deflection under serviceability loading. Used for garage door openings, wide commercial openings, and long-span masonry openings where a reinforced section would require impractical depth.
Supplier Reference
2 suppliers — prestressed precast concrete lintels — scroll to view all
Stresscrete — Prestressed Concrete Lintels — Long Span
Prestressed precast concrete lintel — Stresscrete — long span — national — AS 3600
System Description
Stresscrete is a national prestressed concrete manufacturer supplying prestressed lintels for long-span or heavily loaded masonry openings on Class 2 strata buildings. Prestressing allows a concrete lintel of the same section depth to achieve greater span or carry higher loads than a conventionally reinforced section — used for wide garage door openings, wide commercial ground floor openings, and structurally loaded masonry zones where a reinforced lintel would require a greater depth than the opening geometry permits. Stresscrete manufactures under factory quality control — concrete strength, cover, and strand placement are controlled processes. The structural engineer must specify the required prestress level, camber tolerance, concrete cover, and bearing details. Cannot be cut on site — the exact bearing-to-bearing span must be confirmed before ordering. Mechanical lifting is mandatory for all prestressed lintels.
Technical Properties
- Greater span capacity than reinforced concrete lintel of the same section depth — prestress allows longer spans at a shallower section
- National distribution from Stresscrete facilities — consistent availability for multi-state programmes
- Reduced deflection compared to reinforced concrete at the same load and span — prestress camber partially offsets imposed deflection
Limitations
- Cannot be cut to length on site — bearing-to-bearing span must be confirmed before ordering; same constraint as all precast lintels
- Must not be stored inverted or supported at mid-span only — prestress is in the bottom of the section; invert storage causes top-face cracking
- Mechanical lifting is mandatory — confirm crane or hoist access before ordering
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
VSL Australia / Specialist Prestress Fabricators — Long-Span and Loaded Openings
Prestressed precast concrete lintel — specialist fabricator — long-span / high-load — AS 3600
System Description
VSL Australia and specialist prestressed concrete fabricators supply prestressed lintels for long-span or heavily-loaded masonry openings on Class 2 strata buildings — used where the span or loading exceeds the standard Stresscrete range or where non-standard section geometry is required. Specialist prestress fabricators work to the structural engineer's design — specifying the prestress strand layout, prestress force, concrete grade, cover, and bearing details. The engineer must confirm camber with the fabricator — prestressed lintels have an upward camber under the prestress force, and this camber must be accounted for in the soffit level of the opening. Allow 3–6 weeks lead time for specialist prestress manufacture. Cannot be cut on site. Mechanical lifting is mandatory.
Technical Properties
- Suitable for the longest masonry opening spans — prestress allows sections to achieve spans that would require impractical depth in reinforced concrete
- Engineer specifies the prestress level — optimised for the specific span, load and exposure classification
- Non-standard section geometry available from specialist fabricators — not constrained to standard stock profiles
Limitations
- 3–6 week lead time for specialist fabrication — programme must allow for manufacturing time before delivery
- Camber must be confirmed with engineer before ordering — prestress camber affects the soffit level of the opening; confirm tolerance is acceptable
- Cannot be cut to length on site — exact span must be confirmed before ordering
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
Supplier Comparison
Side-by-side comparison of prestressed precast concrete lintel suppliers. Engineer must specify prestress level and confirm camber tolerance before ordering.
| Supplier | Product | Type | Typical span | Lead time | Camber | Primary use |
|---|---|---|---|---|---|---|
| Stresscrete | Prestressed lintel | Prestressed strand | Up to ~6 m+ (engineer to confirm) | 3–6 weeks | Confirm with engineer | Long span / high load — national supply |
| VSL / specialist fabricators | Specialist prestressed lintel | Prestressed strand — custom | Any (engineer to specify) | 3–6 weeks+ | Engineer to specify tolerance | Non-standard long-span or complex loading |
Critical notes for prestressed concrete lintel replacement:
- NEVER store a prestressed lintel inverted — the prestress strand is in the bottom of the section; inverting the lintel puts the top face in tension, causing cracking that compromises structural capacity before installation
- Structural engineer must specify the prestress level and confirm camber tolerance before ordering — prestress camber affects the soffit level of the opening
- Cannot be cut to length on site — the exact bearing-to-bearing span must be measured and confirmed before ordering
- Mechanical lifting is mandatory for all prestressed lintels — confirm crane or hoist access before ordering
- Inspect every lintel on delivery for cracks, spalling, and dimensional conformance before accepting — do not install a damaged prestressed lintel
- Cavity flashing must be correctly installed above the lintel before re-laying brickwork — confirm cavity flashing type with the engineer
Disclaimer
This page provides general technical information only. Prestressed concrete lintel design, prestress level, camber, cover, span capacity, and bearing details must be specified and certified by a structural engineer for each specific opening per AS 3600 and AS 3700.