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

(13 Reviews)
Current Stock:
Calculated at Checkout
Free Ground Shipping w/ $99 Order
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3.5" to 6.5" Adjustable 4 piece post trim base by RDI

(13 Reviews)
Current Stock:
Calculated at Checkout
Free Ground Shipping w/ $99 Order
Our Return Policy Contractor Rebates FAQ

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"


Reviews (13)

Adjustable base

Written by ralphel Elliott on Oct 22 2019

Has premarked lines to cut by inside goes together very well. When using these trim base pieces if you have a post that’s twisted at the bottom you’re able to trim these pieces to make it hard to tell because it makes it look square to the porch or sidewalk great product.


Written by Betty Kaufman on Sep 2 2019

We haven’t finished the job yet, I’m sure they will look good with the sleeves we bought before.

Skirts for 6 x 6 posts

Written by Jerry ealling on Aug 30 2019

Awesome product to finish off posts

Post base

Written by lisa on Aug 16 2019

These post bases really set off the wraps. Simple to put on, just have to have a way of trimming them to make them fit. Very nice, sturdy product.

RDI Post Wrap

Written by Neal on Aug 24 2018

Looks great once up. Very simple assembly but a bit difficult to install if working alone. No instructions were included so went to the RDI website for a video.

5” porch posts

Written by Don Weaver on Aug 13 2018

Bueatiful appearance , easy to install , it was the icing on the cake my new house needed ! Wonderful product at a fair price and received them quickly ! Not to mention the great customer service ! Thank you !

Base trim

Written by Bill Schinstine on Jul 4 2018

The added base trim turns the post wraps to elegant easy to install

Looks Great

Written by Bigdaddy on Feb 19 2018

Product arrived quickly. Installation went well. Very satisfied.


Written by DONALD BERCHECK on Sep 5 2017


Post trim

Written by KB on Nov 17 2016

Trims were easy to cut and fit.Look great on the Post wraps.I put them at the top and bottom of my posts, Was looking to trim out the tops where the post meets the porch roof for years.

Look Classy

Written by undefined on Feb 5 2016

These look classy and finished off my fluted wraps nicely.

Trim Kits and Post wraps

Written by Richard Vosheski on Aug 26 2015

All of your products were great and they were all installed. My wife really likes them. Thank You!

vinyl post trim

Written by undefined on Aug 20 2015

Product is very solid.

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