Job-Built Form

Definition

A job-built form is a temporary structure or mold constructed on a jobsite to support concrete while it is setting and gaining sufficient strength to become self-supporting.

Purpose

The purpose of a job-built form is to provide a precise shape and support for freshly poured concrete until it hardens and achieves the necessary strength to support itself. These forms ensure that the concrete cures properly in the desired configuration.

Examples of Use

1. Foundation Walls: Job-built forms are used to shape and support concrete foundation walls during construction.
2. Columns and Beams: In building construction, job-built forms provide the molds for concrete columns and beams.
3. Slabs and Floors: Temporary forms are also used for casting concrete slabs and floors to ensure they are level and properly supported during curing.

Related Terms

• Formwork: The overall term for molds and structures used to support concrete during setting.
• Reusable Formwork: Pre-fabricated forms that can be used multiple times for various construction projects.
• Shuttering: Another term for the temporary molds used in concrete construction.

Notes

Job-built forms must be constructed accurately and robustly to withstand the pressure of the wet concrete and maintain the desired shape. Proper removal techniques are also essential to avoid damaging the newly set concrete.