Casing

Definition

Casing refers to the wood finish pieces surrounding the frame of a window or door, or the finished lumber around a post or beam. It can also be a cylindrical steel tube used to line a drilled or driven hole, such as a well or caisson.

Purpose

Casing serves both aesthetic and functional purposes. It provides a finished look to the edges of windows, doors, posts, and beams, covering gaps and rough edges. In its steel tube form, casing is used to support and stabilize drilled holes, preventing collapse and contamination.

Examples of Use

1. Window and Door Trim: Wood casing around the frames of windows and doors to enhance appearance and cover gaps.
2. Structural Support: Steel casing in drilled wells to prevent the walls from collapsing.
3. Beam Covering: Wood casing around structural beams for a finished look in interiors.

Related Terms

• Trim: Decorative woodwork around doors, windows, and other openings.
• Molding: Decorative strips used for trim and finishing purposes.
• Liner: A material that lines a surface, providing protection and stability.

Notes

Proper installation of casing is important to ensure a seamless look and to prevent drafts and moisture infiltration. Steel casing in construction must be installed according to engineering specifications to ensure structural integrity.