Close Menu
AZEK Trimboard Trim

AZEK® Flange Slotted Window Trim

Save Time Installing Window Trim

AZEK Flange Slotted Window Trim is engineered to create beautiful, consistent, and long-lasting window surrounds by removing the installation challenges created by windows installed with a nailing fin. Typical window trims installed over a window nailing fin need to be shimmed or pulled back for the trim to lay flat. AZEK Flange Slotted Window Trim has a relief milled into the back of the most common window surround profiles to accommodate the window nailing flange, reducing any extra work needed to create beautiful looking window surrounds.


  • Saves time—no shimming needed
  • Maintains tolerances
  • Sealed edges on all sides
  • Available in smooth Traditional or woodgrain Frontier finish
  • Rabbeted and Standard profile

Guaranteed against:

  • Rotting
  • Splintering
  • Splitting
  • Delaminating
  • Swelling
  • Warping
Rabbeted Frontier Trimboard

Shown: Frontier

Finish Options


5/4 Window Flange Length Finish
Nominal 18' Traditional Frontier
5/4" Slotted
5/4 x 4” Slotted & Rabbeted
5/4 x 6” Slotted
5/4 x 6” Slotted & Rabbeted

Frequently Asked Questions

Do I need to paint AZEK® Trim?

No. AZEK® Trim products do not require paint for protection, but may be painted to achieve a custom color or to cover nail holes that have been filled. If you choose to paint, use 100% acrylic latex paint with an LRV of 55 or higher.

Learn more
Does AZEK® Trim come in colors?

No, AZEK® Trim products are manufactured in a matte white finish only, but can be painted to achieve a custom color. Please refer to the painting section in our Trim Installation Guidelines.

Learn more
What can I use to clean AZEK® Trim?

Depending on degree of cleaning needed, power wash or hose loose dirt off of the trim board. If using a power washer, be sure to test the pressure setting and nozzle first to ensure that the surface of the trim will not be damaged. Other cleaning methods include using a soft cloth and a mixture of mild detergent.

Learn more