What Is a Top Rail in Construction?

[′täp ‚rāl] (building construction) The uppermost horizontal member of a unit of framing, such as a door or a sash.

What is a top rail?

A top rail is a horizontal member across the top of the railing system that is typically affixed to the vertical posts and acts as a cap to the railing. The top rail is different than the handrail (which is meant to be graspable)

What is the purpose of a top rail?

The purpose of the top rail is to prevent workers from falling off the stairway. The purpose of the stair rail is to provide a hand-hold for workers to use if they trip on the stair. If the stair rail is too high, a worker is less likely to be able to reach and grab it if he/she begins to trip.

Maya Lin-Takahashi

Maya Lin-Takahashi

Consumer Tech & Gadget Reviewer

Maya is a hardware enthusiast who tests and reviews smart home devices, smartphones, wearables, and audio gear. She focuses on practical consumer value and build quality.