How to Install Deck Rail Balusters
Balusters or pickets are the rail components used to provide infill for deck guardrails. IRC code prohibits guardrails from having any openings that would allow a 4" sphere to pass through. This rule produces the need for an attractive and economical repeated system for filling in the openings between rail posts and rail top and bottom members.
Because of the spacing requirement, you will need a lot of pickets or balusters even for a short length of rail. Use our baluster spacing calculator to calculate proper spacing based on your railing dimensions. Balusters will certainly be the most expensive rail component for your project. Years ago, most deck builders used wooden 2x2s nailed to the deck rim and top rail to meet the requirement.
4. This slide shows two options for baluster spacing on straight or angled rail sections. The lower 2x4 example shows placing the dark black center mark (to the right) between two balusters. This will provide more even spacing next to the rail post. The upper 2x4 example shows installing a baluster at the center mark. This will result in the end balusters being placed too close to the rail posts.
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Explore Articles by Topic
Footings
Information related to installing frost footings for decks
Framing
Learn structural framing methods
Decking
Learn about wood and composite decking materials
Stairs
An in-depth look at the complex issue of how to build stairs
Railings
How to install guardrails and handrails to meet IRC code
Features
An overview on water drainage, benches, planters and lights
Design
The basics of deck design
Planning
Learn about permits and working with contractors
Porches & Patios
Build a covered deck to enjoy all seasons
Ledger
Proper attachment techniques
Care
Maintain your deck to maintain your investment
Materials
An overview on water drainage, benches, planters and lights