Repair Systems
Formwork timber
H3 treated DAR structural pine framing — technical reference for concrete spalling in Australian remedial building practice. Covers system selection, product comparisons, and brand equivalents.
What is formwork timber?
Formwork timber — typically dressed all round (DAR) pine or hardwood framing members — provides the structural framework and support for formed concrete sections including repair pours, cast-in-situ column encasements, slab edge works, and structural infills. In remedial concrete works, timber formwork is constructed to encase columns, beams, and slab soffits where the repaired section must be confined during placement and curing to achieve the design profile. The formwork system must be designed by or under the supervision of an experienced formwork carpenter to safely resist the imposed fresh concrete head pressure without deflection or blowout. Most formwork in remedial work uses DAR pine framing with plywood sheet facing, secured with form ties and braced with props. Formwork is typically stripped within 24–72 hours once the repair mortar or concrete achieves sufficient green strength.
Product Reference
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System Description
H3 CCA treated per AS 1604. DAR for smooth form faces. Typical 90x35 or 140x35 mm.
Technical Properties
- Flexible and easy to cut, notch, and fix with standard carpentry tools on site
- Readily available from all timber merchants and hardware stores
Limitations
- Requires experienced formwork carpenter to design and brace for safe concrete loads
- Moisture cycles cause swelling and warping — affects formed surface quality
PROCUREMENT SOURCES
System Description
H3 CCA treated per AS 1604. DAR for smooth form faces. Typical 90x35 or 140x35 mm.
Technical Properties
- Flexible and easy to cut, notch, and fix with standard carpentry tools on site
- Readily available from all timber merchants and hardware stores
Limitations
- Requires experienced formwork carpenter to design and brace for safe concrete loads
- Moisture cycles cause swelling and warping — affects formed surface quality
PROCUREMENT SOURCES
System Description
H3 CCA treated per AS 1604. DAR for smooth form faces. Typical 90x35 or 140x35 mm.
Technical Properties
- Flexible and easy to cut, notch, and fix with standard carpentry tools on site
- Readily available from all timber merchants and hardware stores
Limitations
- Requires experienced formwork carpenter to design and brace for safe concrete loads
- Moisture cycles cause swelling and warping — affects formed surface quality
PROCUREMENT SOURCES
System Description
H3 CCA treated per AS 1604. DAR for smooth form faces. Typical 90x35 or 140x35 mm.
Technical Properties
- Flexible and easy to cut, notch, and fix with standard carpentry tools on site
- Readily available from all timber merchants and hardware stores
Limitations
- Requires experienced formwork carpenter to design and brace for safe concrete loads
- Moisture cycles cause swelling and warping — affects formed surface quality
PROCUREMENT SOURCES
System Description
H3 CCA treated per AS 1604. DAR for smooth form faces. Typical 90x35 or 140x35 mm.
Technical Properties
- Flexible and easy to cut, notch, and fix with standard carpentry tools on site
- Readily available from all timber merchants and hardware stores
Limitations
- Requires experienced formwork carpenter to design and brace for safe concrete loads
- Moisture cycles cause swelling and warping — affects formed surface quality
PROCUREMENT SOURCES
Brand Equivalents
Side-by-side view of equivalent products across all major brands.
| Material | Ardex | Sika | Fosroc | Tremco / Other | Parchem / Mapei |
|---|---|---|---|---|---|
| Formwork timber (DAR pine) | Hyne Timber | Timberlink | Carter Holt Harvey | Bowens Timber | Local timber merchant |
Disclaimer
Information is general only. Product selection must be confirmed against project requirements, substrate condition, exposure class, manufacturer technical data sheets, NCC requirements, Australian Standards (including AS 3600), and consultant or structural engineer specifications. Do not rely on this reference as a substitute for professional engineering advice.
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