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Extra Support For Long Stair Stringers

If your stringers are more than 10’ long, we recommend installing a rigid beam at mid-span to add support to the structure. The strength of stair stringers is considerably weakened by the cuts made to create the stair surfaces, and stairs must be strong enough to withstand heavy foot traffic and very stressful conditions. Both visually and structurally, it is preferable to break long stair runs with intermediate landings. In some cases, however, you may need to use one long run.

Stringer Supports

A brace will dampen the shear stress that can compromise the integrity of the stringers in the center of the stairs. Most deck stairs are under-built and, as a result, feel bouncy and are at risk to collapse, especially after weathering can propagate cracks in the stringers. You also may consider doubling your stair stringers by nailing two 2x12s together like a beam in order to increase strength. Adding blocking between stringers also can strengthen the entire stair structure.


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Create a free account and get instant & exclusive access to all that Decks.com has to offer:

Checkmark 1,000+ How-To articles
Checkmark 80+ Free Deck Plans
Checkmark Deck Planning Calculators
Checkmark Free & Simple Deck Design Tool
Staircases

Extra Support For Long Stair Stringers

If your stringers are more than 10’ long, we recommend installing a rigid beam at mid-span to add support to the structure. The strength of stair stringers is considerably weakened by the cuts made to create the stair surfaces, and stairs must be strong enough to withstand heavy foot traffic and very stressful conditions. Both visually and structurally, it is preferable to break long stair runs with intermediate landings. In some cases, however, you may need to use one long run.



A brace will dampen the shear stress that can compromise the integrity of the stringers in the center of the stairs. Most deck stairs are under-built and, as a result, feel bouncy and are at risk to collapse, especially after weathering can propagate cracks in the stringers. You also may consider doubling your stair stringers by nailing two 2x12s together like a beam in order to increase strength. Adding blocking between stringers also can strengthen the entire stair structure.


Popular Stairs Articles
Staircases

Box Steps and Stairs

Learn how to build a set of box platforms to act as stairs for a low deck. You don't need to cut stair stringers.

Staircases

Stairway Lighting

Learn about how to install low-voltage deck stair lighting.

Staircases

Stair Stringer Length

Learn how to measure the height of your deck and use our Decks.com Stairs Calculator to determine your stair stringer lengths.

Next Step: Railings Articles
Deck Railing Types

Glass Rails

Installing glass rails will usually require you to build the rail frame first and take precise measurements to custom order the tempered safety glass...

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All decks greater than 30" above grade must have a guardrail.

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Glass Rails

Installing glass rails will usually require you to build the rail frame first and take precise measurements to custom order the tempered safety glass...

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Explore Articles by Topic

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