Gliding patio doors with four (4) door panels sharing a single frame have a special weatherstrip where the operating patio door panels meet. The operating door panel on the left (as viewed from the exterior of the home) has an astragal applied to it. This astragal contains a weatherstrip unique to four (4) panel patio door units.
The operating panel on the left is the right-handed operating panel. For additional assistance with 4-panel gliding patio door handing, see 400 Series Frenchwood® Gliding Patio Door and Replacement Part Handing.
The astragal weatherstrip consists of an inside-facing and outside-facing piece. These pieces may be ordered separately.
Astragal Center of Unit
Replacement Parts
To order replacement astragal weatherstrip, 
the size of your patio door is required. To determine your patio door size, see Determine the Size of Your Andersen® Window or Patio Door.
Inside Facing Astragal Weatherstrip
This weatherstrip is attached to the astragal, closer to the inside of the home.
Outside Facing Astragal Weatherstrip
This weatherstrip is attached to the astragal, closer to the outside of the home.
Installation
Tools / Supplies Needed
Safety Glasses
Phillips Head Screwdriver
Thin Blade Putty Knife
Mild Soapy Water
Soft, Dry Cloth
Vinyl-to-Vinyl Adhesive
Remove the astragal: Open the patio doors and remove the original weatherstrip by inserting a thin blade putty knife between the weatherstrip and the astragal to break the adhesive seal. Gently pull the weatherstrip to remove it. For instructions, reverse the steps found in the Astragal Installation Guide (0004195).
Clean off any debris or residual adhesive from the astragal with mild soapy water and a soft, dry cloth.
Apply the new weatherstrip using vinyl-to-vinyl adhesive. Follow the adhesive manufacturer's instructions for proper use and application.
Reinstall the astragal weatherstrip to the patio door panel using the Astragal Installation Guide (0004195).
Gliding patio door units have additional weatherstrip on the patio door panel and the unit frame. See the related articles below for more information.
Contact Andersen® Windows and Doors today for assistance with a quote for replacement parts.
©2026 Andersen Corporation. All rights reserved.
