Spring Bronze vs Interlocking Weatherstripping: Which Is Better?
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Interlocking gives the best seal; spring bronze is easier. If your door already has interlocking strips, replace them with interlocking.
How each one works
- Spring bronze is one flexible strip nailed to the jamb. The door presses it as it closes and it springs back when the door opens.
- Interlocking uses two metal profiles, one on the door and one on the frame or threshold, that hook together when the door closes.
Choose spring bronze when
- You want a durable metal seal without cutting kerfs in the door.
- The gap is 1/16" to 3/16".
- The door swells and shrinks a lot with the seasons.
- You're doing it yourself. One-door kit · install guide
Choose interlocking when
- You want the best seal against wind and rain.
- The door already has interlocking strips or a hook at the bottom.
- You can kerf the door accurately (or hire it out). Install interlocking after the door has acclimated, because adjusting it later means pulling it and re-installing.
- Parts: L-strip, J-hook strip, bronze thresholds, kerfing saw.
Either way
Align the door first. Do the 1-minute door alignment check. Then read our weatherstripping guide.
Common questions
Is spring bronze or interlocking weatherstripping better?
Interlocking gives the best seal; spring bronze is easier to install. If the door already has interlocking strips, replace them with interlocking.
How does interlocking weatherstripping work?
Two metal profiles, one on the door and one on the frame or threshold, hook together when the door closes.
What gap does spring bronze seal?
Standard spring bronze suits gaps of about 1/16 to 3/16 inch.
Want it done for you?
Classic Door installs weatherstripping and bronze thresholds on historic doors across New England. Anywhere else, send photos of the full opening, the door edge and the sill and we will tell you what you have and what to order. Not sure you picked the right part? Write "verify my order" in the order notes and we will check it before it ships.