Internal structural post for 4x4 Post Sleeves

$56.99 - $64.99
Usually arrives in 10 business days
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Internal Structural Post by RDI


  • Two different mount styles to choose from: flush, or fascia 

  • Two different lengths to choose from: 36” or 42”

    • Flush mount measurements:

      • 36” = 36.625”

      • 42” = 42.625”

    • Fascia mount measurements:

      • 36” = 42.625”

      • 42” = 48.625”

      • Inner block thickness = 3.77”

  • Material: galvanized steel = structural post, vinyl = post leveling shim


  • Structural post (1)

  • Post sleeve centering extrusion (2)

  • Centering extrusion attachment screw (1)

  • Post leveling shim (2)

  • Installation instructions

More details:  

  • Lifetime warranty

  • Hot dipped, galvanized enriched zinc steel

  • Internal structure, used instead of a 4” x 4” post

  • Designed to meet IRC (International Residential Code) & IBC (International Building Code) – code compliant

    • Click HERE for code report

Not included:
  • Post sleeves

    • Click HERE for post sleeves

About this product…

The Internal Structural Posts by RDI are a cost-effective, easeful option for homeowners intending to wrap their posts with post sleeves. These steel posts are offered in two different mounting styles; the flush mount and the fascia mount. The flush mount is secured to the surface of the deck, while the fascia mount is secured to the side of the deck. Wrapped around the hot-dipped galvanized steel structural posts are multiple points of vinyl excursion centers, which support the prospective post sleeve or newel. These excursions create greater stability and load bearing capacity by transferring the load placed on the railing to the structure below the deck surface. 

These posts can be mounted to either the deck frame or a surface mount. 

Along with sustainability, these posts come in two different lengths, 36” or 42”, allowing the customer flexibility and choice when customizing their outdoor area. 

Internal Structural Post Installation Instructions:

Simply follow the installation instructions provided in your order. Any questions with installation, please call 1-877-265-2220 


Click HERE for Installation GUIDE

Still have questions or need advice on ordering the right supplies for your project? Get in touch with Deck Expressions’ 24/7 customer service. We’re always ready to help.

Transferable Limited Lifetime Warranty Aluminum Railing Who is covered: • The limited lifetime warranty covers single-family residential properties only. This limited warranty extends to the original purchaser and one (1) individual transferee as specified herein. • A twenty (20) year limited warranty covers any other type of building or property including those owned by corporations, governmental agencies, partnerships, trusts, religious organizations, schools, condominiums, homeowner associations, cooperative housing arrangements and apartment buildings. The warranty period will be twenty (20) years following the original date of Product purchase.

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