A new plastic insert for forms makes it possible to cast hog-pen dividers in place. Such durable dividers offer advantages over steel-gate dividers which slowly rust out, wood dividers that rot or fiberglass dividers which are not as sturdy as concrete dividers. Precast concrete pen dividers have come into use in recent years but they are heavy to handle, awkward to maneuver through openings of limited size and difficult to fit to job requirements when installed in existing buildings. The new plastic inserts for forms make it possible to readily cast in place pen dividers of various heights in new or existing buildings. The open pen dividers improve ventilation within the building and allow the pigs to observe other pigs in adjoining pens, thus avoiding the nervousness that can build up from noises of unseen origin. Concrete pen dividers do not get chewed by hogs and they are easy to clean and sanitize.

The plastic form inserts are units that have been molded from polyvinyl chloride (PVC). Inserts are available in 36- or 48-inch-high units, 3 feet long. Each unit weighs about 2 pounds and a nest of 15 pairs can be readily handled. When assembled within a form they completely cover the two inside faces of the form so that all the concrete placed comes in contact with the insert only. They are precision molded so that adjacent units abut one another tightly to minimize or eliminate formation of fins.

Pen walls may be formed by any one of several standard wall forming methods, using either modular panels or built-in-place forms. The inserts are held in place between the forms by tightening the standard form ties. The form ties pass through the boxout areas rather than through the concrete so that when the forms are stripped the form ties are automatically recovered for reuse. The inserts are provided with a number of dimples which can be drilled out to accommodate whatever ties are to be used, depending on where they need to be positioned.