Shuttering and Formwork Basics

By Vystra · 8 October 2026

Concrete is a liquid when poured — it takes whatever shape holds it. That mould is formwork (shuttering), and its quality directly affects the finish, strength and cost of your concrete.

What formwork is

Formwork (or shuttering) is the temporary mould that holds wet concrete in place until it hardens enough to support itself. It's removed and often reused afterward.

Why it matters

• Shape and dimensions — poor formwork means crooked, wrong-sized members.
• Finish — good formwork gives smooth surfaces; bad joints leave bulges and honeycombing.
• Safety — weak formwork can fail under the weight of wet concrete.
• Cost — formwork is a significant part of concrete cost, and reuse saves money.

Common types

• Timber — traditional, flexible, lower reuse.
• Plywood — smoother finish, decent reuse.
• Steel/aluminium — expensive but very smooth and many reuses.

Keys to good formwork

• Rigid and well-supported — no bulging under load.
• Tight joints — to prevent slurry leaking out.
• Clean and oiled — so it releases cleanly and can be reused.
• Correctly aligned — checked for level and plumb before pouring.

When to remove it

Removal timing depends on the member and the engineer's advice:

• Columns/walls (vertical): often 1–2 days.
• Slab and beam soffits/props: much longer, often 14–21 days.

Removing too early can crack or fail the concrete.

The takeaway

Formwork quality quietly decides how good your concrete looks and performs — and reusing it well controls cost. Don't treat it as an afterthought. With BuildVystra you can budget formwork and track it as part of each concrete stage.

Frequently asked questions

What is the difference between shuttering and formwork?

The two terms are often used interchangeably. Formwork is the general term for the temporary mould that holds concrete until it sets. Shuttering usually refers to the vertical formwork for elements like columns and walls, though on site both words are commonly used to mean the same thing.

How long should formwork stay before removing it?

Removal time depends on the member. Vertical formwork for columns and walls can often be removed in about 1–2 days, while slab and beam soffits and their props should stay much longer, often 14–21 days, following the engineer's guidance and load conditions.