What is a baluster?
A baluster is a vertical spindle or picket that fills the space between railing posts on a deck, subject to building code spacing and height requirements.
The vertical members that run between your deck's railing posts are called balusters, and they serve both safety and aesthetic purposes. Every deck railing requires balusters spaced to meet local building codes, typically no more than 4 inches apart in the Charlotte area to prevent a child's head or body from passing through. This spacing rule is enforced by county inspectors during the permit process.
Balusters come in several common materials. Pressure-treated wood remains the most traditional choice for residential decks and can be stained or painted to match your deck. Composite balusters, made from wood fibers and plastic, resist rot and require no staining, making them lower maintenance. Aluminum balusters offer durability and a modern appearance, especially in contemporary designs. Metal balusters with decorative patterns or profiles add visual interest to standard railings.
The height of balusters matters as much as their spacing. Your railing must reach at least 36 inches high, and balusters cannot have horizontal rails spaced more than 4 inches apart either, to meet child safety standards. These requirements apply whether you're building a new deck or replacing an existing railing. When working with a professional deck builder in Greater Charlotte, discussing baluster material and style early helps ensure your design meets both code and your preferences before construction begins.