The Clopay 3.5" Bottom Seal Astragal is a genuine garage door weatherstrip designed to restore a tight floor contact on compatible Clopay sectional doors. This flexible, compressible seal helps block drafts, water, dust, light, and pests along the door’s lower edge, supporting smoother operation and improving comfort in the garage. Often called a bottom astragal or garage door bottom weather seal, it’s intended for Clopay doors that use a matching bottom retainer, delivering a factory-style fit and performance for residential or light commercial applications.
Installation typically involves lowering and securing the door, removing fasteners at one end of the bottom retainer, and sliding the replacement seal fully into the retainer channel before securing the end again. Confirm that your existing bottom retainer and door model are specified for a 3.5" Clopay bottom astragal; this is not a universal fit. For best results, follow Clopay’s maintenance and installation instructions, verify compatibility with your door’s retainer profile, and avoid working near spring or lift cable hardware. This replacement part is suitable for routine upkeep when the original weatherstrip has become worn, brittle, or deformed, helping maintain an effective barrier against the elements and ensuring a clean, finished look at the base of the garage door.