How to Install Deck Stair Railings
Guardrails must be provided on the open side of a stair where it is more than 30" above the floor or grade. Stair rails must be at least 34" high, measured from the nosing of the stair treads. No opening shall allow a 4 3/8" sphere to pass through with the exception that you are allowed a larger opening provided for the triangle formed between the stair riser, stair tread and bottom edge of the bottom rail. This open space may not allow a 6” sphere to pass through it.
Be sure to lay out the position of your rail posts before installation. This is usually the trickiest part. If the top rail post is set at the rear of the tread, you will want to align the bottom post similarly. Landings and stairs that change directions will often require the thoughtful situating of rail posts to allow for a system that looks and performs well. Grippable handrails are required and must meet specific requirements.
Secure bottom stair rail post to stair framing with (2) 1/2" bolts or equivalent. In this case, we bolted the rail post to the riser board. You may also attach the post to the stair stringer. Make sure the rail post is long enough for a 34" minimum rail plus additional room for post cap mounting.
Guardrails on stairs must be at least 34" high, measured from the nosing of the treads. Measure and cut your aluminum balusters to fit your stair railing assembly. Next, slide the balusters over the bottom stair rail connectors. Then, slide the top rail connectors into the balusters from the bottom up.
Notice that the top cap terminates into the rail post at the same height as the deck guardrail. Install the 2x4 or 2x6 rail cap over the top rail. Pre-drill and screw the ends of the top cap into the rail posts and secure the center with additional screws. Secure the top cap through the bottom of the 2x4 or 2x6 into the side of the bottom stair rail post.
Glass Deck Railing Ideas and DIY Installation Tips
All glass panels used for deck railings must be safety-tempered and shatter-resistant. Learn how to install glass railing panels and get ideas for your deck.
Balusters
Step-by-step instructions on installing deck rail balusters. Learn how to install metal balusters with connectors.
Steps To Build & Secure A Deck Railing Planter
Railing planters are an easy way to add some color to your deck without taking up space. Follow these simple steps and get started on your railing planters today.
Deck Skirting
Skirting can be an attractive feature that can be added to any low-level deck.
What Does it Cost to Enclose a Deck?
Want to enclose your deck but wondering how much it costs? Learn the cost to enclose your deck, porch, or patio to enjoy it all year round.
Deck Fire Pit Ideas
Fire pits can add ambiance and coziness to your deck year round. Get ideas and inspiration for adding a fire pit to your deck.
More Helpful Resources
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
Reddit Railing Questions Answered
Deck railing is an essential component of any deck, providing both safety and style. However, with so many materials, designs, and installation factors to consider, questions often arise.
Deck Railing Codes
Learn about the building codes that regulate guardrails. How high do rails need to be? What are the rail infill requirements?
Parts of a Deck Railing
We discuss the different components that compose a wood deck rail system. Learn about rail posts, top and bottom rails, balusters and a top cap.
5 Best Ways on How to Hide Trash Cans Outside
Outdoor trash cans can be an unwanted eyesore. Discover how you can easily cover them up and add an extra touch of beauty to your yard.
Deck Stain Color Ideas & Inspiration
Choosing a stain color for your deck can feel overwhelming. Get inspired with deck stain color ideas and options.
Best Outdoor Patio Umbrellas
These are the best outdoor umbrellas for your patio or deck to keep you cool on those sunny summer days. Check out our top umbrella picks at Decks.com.
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