Anatomy of a Rail
Understanding the basics of deck and stair railing components helps you shop smarter. Here’s a simple breakdown of the key railing components that make up a complete system.
Key Railing Components
Every railing system is made up of a few essential parts. Here’s what they are and how they work together.
A vertical support that anchors the railing system. Posts secure the structure and provide stability at ends, corners and midpoints. RDI Railing offers structural posts and post sleeves designed for strength and clean finishes.
The upper horizontal rail that provides support and a finished look. RDI Railing top rails are engineered for strength and comfort.
The lower horizontal rail that connects to posts and supports the infill.
The finishing touch that tops each post. RDI Railing offers flat, pyramid and decorative post cap options.
A decorative ring that covers the base of the post sleeve for a polished appearance.
Glossary
Railing Terms Made Simple
A quick-reference guide to common railing terminology.
Level Rail Panel
A pre-configured railing section designed for flat applications. RDI Railing level panels are available in vinyl, composite, aluminum and steel.
Post Sleeve
A sleeve that slides over a structural post to create a finished look. RDI Railing post sleeves are color-matched to railing systems.
Post Cap
A decorative or functional cap placed on top of a post. RDI Railing offers multiple cap styles to complete your design.
Trim Ring
A finishing piece that hides gaps at the base of the post sleeve.
Rail
Horizontal components that connect posts and hold infill in place. RDI Railing rails are engineered for strength and easy installation.
Pre-assembled Panel
A ready-to-install railing section with infill already secured. RDI Railing offers pre-assembled options to streamline installation.
Baluster
A vertical infill component between rails. RDI Railing provides various baluster styles and materials.
Rail Kit
A packaged system including rails, brackets and infill components for easy assembly.
Brackets
Connectors that secure rails to posts. RDI Railing brackets are designed for durability and a clean look.
Mid Post
A post placed between end posts to provide additional support along longer spans.
End Post
A post used at the end of a railing run.
Corner Post
A post used where two railing sections meet at a corner.
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