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Concrete & Masonryaka: falseworkaka: shoringaka: centering

Formwork

In Plain English

The entire temporary support system — forms, shores, and bracing — that holds concrete in place while it hardens.

Definition

The complete system of temporary molds, supports, shoring, and bracing used to contain and shape concrete until it develops sufficient strength to be self-supporting. Formwork design is an engineering discipline requiring analysis of concrete pressure, construction loads, and safety factors. Premature form removal (stripping) before concrete reaches adequate strength can cause collapse.

Why It Matters in Bidding

Formwork is often the single largest labor and cost driver in cast-in-place concrete, frequently exceeding the cost of the concrete itself, so estimators must take it off by contact-square-foot of form surface rather than by concrete volume. Reuse cycles, complexity, shoring duration, and finish requirements heavily influence the unit price and can make or break a competitive concrete bid.

Example

Estimating a parking structure, the concrete estimator priced the elevated deck formwork at a per-square-foot contact area and assumed four reuse cycles of the shoring system to keep the bid competitive against firms quoting single-use forms.

Related Terms

Frequently Asked Questions

Formwork is measured by the contact area in square feet, the surface of the form touching the concrete, not by concrete volume. Estimators count walls, columns, decks, and beam sides separately because each has different labor rates. Reuse cycles, ties, release agents, and shoring rental are added as distinct cost components.
Formwork is labor-intensive to erect, brace, and strip, and it requires engineering, shoring, and skilled carpenters. Concrete material is comparatively cheap per yard. On complex geometry or high walls, forming and shoring labor plus form rental or amortization frequently dominate the line item, which is why reuse cycles drive pricing.
Estimators verify required concrete finish class, since architectural or board-formed finishes raise costs sharply, plus form-tie patterns, reshoring duration, and any owner restrictions on stripping time. Specified minimum strength for form removal affects schedule and shoring rental, both of which feed directly into the labor and equipment estimate.

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