White 4" to 6" Adjustable 4 piece post trim
Clean and classic, this white adjustable post trim fits 4" to 6" posts and snaps together in four pieces for a secure, polished base.
View Product
Versatile 4x6 Post Skirt for a Clean, Professional Finish
What It Is
The RDI 4″ to 6″ Adjustable Vinyl Post Skirt is a vinyl base trim accessory designed to wrap around and finish the bottom of a vinyl railing post (or post wrap) where it meets a deck surface.
It bridges the gap between the post and deck, giving a clean, polished look instead of an exposed post end. This is especially useful with Endurance, Finyl Line, Titan Pro Rail® and other RDI vinyl railing products.
Key Features
- Adjustable fit: Designed to cover posts or sleeves ranging roughly from 4″ up to 6″ square — so one skirt works on multiple post sizes.
- 4-piece design: Comes in four segments that snap together around the post for easy install and removal.
- Vinyl construction: Made from weather-resistant vinyl, it resists fading, moisture, and requires very little maintenance.
- Color options: Typically available in classic deck colors like white, clay, or sand to match your railing.
- Versatile placement: Ideal as a post base skirt, and can even be flipped to use near the top of a wrapped post if needed.
Why You’d Use One
The adjustable vinyl post skirt is a trim piece, not a structural element — its purpose is cosmetic and finishing:
- Hides gaps or rough edges where the post meets decking
- Adds a finished, professional look to railing installations
- Matches vinyl railing aesthetics better than bare posts
- Works well when a full post wrap isn’t feasible
DETAILS:
-
Material: vinyl
-
3 different colors to choose from: white, clay, and sand
Measurements:
-
Adjusts to fit 4” - 6”L x 1-1/4”W, 1-1/16”H
WHAT’S INCLUDED:
-
4-piece base post trim (1)
More details:
- Made in the USA
- Low maintenance
- Weather-resistant vinyl
- Can easily assemble and disassemble
About this product…
Post trims are designed to wrap around the bottom of your 4-piece post wrap, providing a smooth and stylish transition between your columns and decking. These trims add cohesion and polish to your project by bridging material gaps in a visually appealing way. If you’re working on a deck or porch and want to evoke the timeless look of beveled wood without the added cost and maintenance, the adjustable four-piece post trim by RDI offers a smart alternative. Functioning as a versatile 4x6 post base cover, this adjustable trim is incredibly easy to install and works with posts ranging from 4" to 6". It provides the aesthetic charm of traditional wood while offering the long-term durability of weather-resistant vinyl. Whether you’re finishing the base of a post or flipping it to use at the top of a 4x4 4-piece wrap, this trim delivers both function and flexibility. Available in classic white, clay, and sand tones, these post bases add a professional touch to any deck or railing setup—ideal for both contractors and homeowners. Their snap-together design ensures quick installation, making them a go-to choice when sliding a trim over an existing post isn’t feasible. With low-maintenance materials and a lifetime warranty, RDI’s adjustable post trims are built to last—and built to impress.
Installation Instructions:
Simply snap the four pieces together to assemble and disassemble with ease.
Need help? Call 1-888-758-7678 or reach out to Deck Expressions’ 24/7 customer service—we’re always here to help.
