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The strip you are looking at has a name, and it is not the whole weather system. DASMA, the door manufacturers’ association, calls a compressible seal on the bottom edge an astragal. It calls a bottom weatherseal that astragal, or any other strip, attached so it meets the floor. The clip that holds it is an astragal retainer. Clopay’s winter advice uses both “weather seal” and “astragal” for the piece you see under the door.
Sides and top are a different order. Clopay’s parts shop sells bottom, top, and side seals as separate items and says to measure the length of the door and the width of the channel the seal slides into. Replacing the bottom and expecting the drafts at the jamb to stop will disappoint you.
A gap you can see with the door shut
Clopay’s October 2022 winter note is a simple test: door closed, look for a gap between the bottom of the door and the driveway. If you see one, it says replace the weather seal. Its parts guide adds two more: cracks or visible wear in the strip, and a cold draft you can feel with your hand along the bottom. Either of those, it says, is time to replace it, through a Clopay dealer or at The Home Depot.
That is a manufacturer test, not a Long Island invoice. It does not say how many dollars. It also does not say the gap is always the rubber. A door that sits crooked because a cable slipped will show daylight on one side too. If the bottom edge is not level, read off track and cable replacement before you buy a strip.
Water on the floor after rain, with a level door, fits Clopay’s description of what the seal is for. Its parts guide says the strip helps keep out water, dirt, and pests, and slows heat loss at the floor. The Clopay door page is where R-values live. A new seal does not turn an uninsulated door into an insulated one.
No Long Island seal price is printed
Island Door Pros in Plainview, on its repair page, lists weatherstripping with springs, cables, rollers, and panels as parts that wear out, especially with salt air. Its April 2026 price table runs from springs to cables to rollers to panels to openers. There is no seal row. Precision’s repair FAQ lists weather seal replacement among the jobs it does, next to springs and cables, and then does not give a seal figure. The $69 on that page is the visit fee for an inspection, waived if you approve a repair. It is not a seal price.
So this page will not invent one. Repair cost explains how to compare a visit fee with a part price once a company names a number. Ask three things: bottom strip only, or sides and top too; whether the metal retainer is included; whether the $69 or any other trip fee stays on the bill.
A rotten or creased bottom section is a panel, not a seal. Island Door Pros prices that section at $250 to $550. The panel page has Clopay’s rule for when the section is still made.
When the bottom fixture is part of the job
DASMA’s definition of the bottom bracket matters more than the rubber. That bracket sits on the bottom section, holds rollers, and may be where the lift cables attach. Sliding a new astragal into an intact retainer is one job. Unbolting the bracket, or a retainer that is bent into the bracket, is cable geometry. Stop if the person on the phone says the cables have to come off. That work belongs with a technician, for the same reason Clopay gives on springs: the tension is not a homeowner project. The spring page is the warning in full.
If the door reverses while closing after years of sealing fine, do not assume a fat new seal is the cause until the eyes and the close limit are ruled out. That sorting is on will not close.
What to measure before anyone orders a strip
From Clopay’s parts page, two measurements:
- the width of the door, so the seal is long enough
- the width of the channel the old seal sits in, so the new bead fits the retainer
Add the color and the door model if you know them. A double door and a single door are not the same length of rubber. If you cannot see the channel without kneeling under a crooked door, skip the measurement and describe the daylight instead. The technician can measure a door that is still on its tracks.