Plastic Formwork for Columns: Design and Setup Guide

Columns are among the most repetitive elements on a concrete job, which makes them a good fit for reusable formwork. This guide covers planning, setup and care for plastic column formwork on Australian sites.

Options for plastic column formwork

• Modular plastic column systems. Purpose-made panels and clamps that adjust to a range of column sizes.

• Plastic sheets on a timber or steel frame. Plastic formwork sheets are cut to the column faces and fixed to studs and yokes in place of formply. The sheets are designed for 50–100+ uses and are waterproof, so they don't swell between pours.

Design first

Column formwork carries high sideways pressure from fresh concrete, especially in tall pours. Have the formwork designed by a competent person, including yoke or clamp spacing, ties and bracing. In Australia, AS 3610 (Formwork for concrete) and Safe Work Australia's formwork guidance are the key references, alongside your state or territory WHS regulations.

Setup step by step

1. Set out column positions and mark or cast a kicker so the form sits square and in position.

2. Check sheets for damage and clean the faces before assembly.

3. Assemble the faces and fix them to the frame or clamps, keeping corners tight. Chamfer strips in the corners give cleaner edges.

4. Stand the form, brace it in two directions, and check plumb with a level or laser.

5. Seal the base and joints to stop grout loss.

6. Have the form inspected before the pour.

Pouring and stripping

Pour at the rate allowed by the formwork design and vibrate carefully. Strip only when the concrete has gained enough strength, as specified for the job. Plastic faces release cleanly, which helps protect the column edges.

Care between pours

• Wash faces with water and a brush.

• Inspect edges and fixing holes, and set aside damaged sheets.

• Store sheets flat, dry and out of direct sun.

With good care, each sheet can deliver 50–100+ uses, which can mean a saving of up to 70–80% on replacement costs compared with plywood.

Common mistakes

• Bracing in one direction only.

• Spacing yokes or clamps further apart than the design allows.

• Pouring too fast for the form.

• Reusing swollen plywood that bows and marks the finish.

Planning a column pour? Get a Quote.