3.5" to 6.5" Adjustable 4 piece post trim base by RDI

$9.99 - $11.99
Contractor Rebates
(22 reviews) Write a Review
Calculated at Checkout

Adjustable 4-Piece Post Trim Base by RDI

Trim comes in 4-pieces that slide into one another creating sizes between 3-1/2" to 6-1/2"

For use when sliding over an existing post is NOT an option!

Can also be used as a standard base post trim.

If you’re working on a deck or porch project and are looking to evoke the timelessness of beveled wood details, consider adjustable four piece post trim by RDI as an equally alluring solution for a fraction of the hassle and cost. Not only is this adjustable deck post base incredibly easy to work with, but it is just as attractive as any wood option. The flexibility this adjustable four piece deck post base offers makes it an appealing addition to any railing or deck, as long as your posts range in size anywhere from 3.5 to 6.5. Available in White, Dune, and Earth, these post bases are sure to add polish to any job, whether you are a contractor or a homeowner making a few improvements.

Crafted using weather-resistant vinyl, RDI’s adjustable deck post base can withstand the elements and is incredibly low-maintenance. Plus, RDI offers a lifetime warranty on all of its products, so you never have to worry. As a bonus, Deck Expressions offers free domestic shipping on all orders over $99.99, so you can afford to stock up on everything you need to finish your project and make your home look great.


  • Post trim adjusts to fit posts from 3-1/2" to 6-1/2"
  • Great for Post Sleeves 
  • Works on any post size from 3.5" to 6.5"
  • Comes in 4 - pieces


  • White
  • Dune
  • Earth

final-line-color-white.png final-line-color-earth.png final-line-color-dune.png

Width - 1-1/2"

Height - 1- 5/8"


Videos Hide Videos Show Videos

22 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Shawn on Jul 17 2020

    The adjustable post trim is great. It fit exactly how i needed it. It shows exactly where to cut on the inside of the trim. For the most part they are secure however it seems they could use a little more support. I have not done it yet but will be adding some silicon on the back side to keep them in place and from accidentally coming apart. Other than that they look great with the post wrap.

  • 5
    4 Piece Base Trim

    Posted by SHELIA Francine COLEMAN on Jul 14 2020

    Excellent service. I made an error in ordering the trim pieces for our post wraps. I contacted Danny the sales rep for my order. He helped me resolve the issue, refunded my initial order and expedited the correct product size needed to complete our project on time. I would definitely recommend Deck Expressions for your out project needs.

  • 5
    Adjustable 4 piece post trim

    Posted by salvatore Slusher on Jul 9 2020

    items were easy to cut and install. Nice finishing touch to posts.. Mine were not installed over post wraps they were installed around the post itself at the base on the surface of the deck floor.

  • 5
    adjustable 4 pc. post trim

    Posted by Unknown on Jul 7 2020

    Good quality, easy to install. Made a good install look great.

  • 5
    Adjustable post trim

    Posted by Jessica C on Jun 18 2020

    These finish off our Farmer’s Porch post wraps perfectly! Very easy to install and make a nice finishing touch!

  • 4
    Nice finish

    Posted by Chuck Skellen on Jun 12 2020

    They made the new post wraps look great.

  • 5
    Great product

    Posted by Andy Munoz on Jun 5 2020

    Love the style, the quality of the material, and the price.

  • 5

    Posted by Matthew Harris on May 7 2020

    These adjustable trim pieces are super easy to install, and they look great after installation.

  • 4
    One of them came broken

    Posted by John Zaccone on Jan 25 2020

    As it turned out, I didn't need them, It is a great concept. I did test the one that wasn't broken and it would have been a good fit. I understand that things can happen in shipping. I didn't bother to contact the seller so I am not going to give a bad review. But maybe start wrapping them in bubble wrap in the future.

Deck Expressions, LLC BBB Business Review
Deck Expressions Decking Supplies