Copper vs Bronze Weatherstripping

Choose bronze. Spring weatherstripping only works if the metal keeps springing back. Pure copper is soft and flattens sooner. Spring bronze is a hard-temper copper alloy made to flex every time the door opens and closes.

The details

• Spring bronze is typically alloy 220 (about 90% copper, 10% zinc), very hard temper, about 0.009" thick. It looks coppery to brassy and tarnishes to brown.
• Copper strip looks similar but is softer, so it is less suited to a spring seal.
• Nails: copper-plated steel nails are traditional with spring bronze; solid bronze or brass nails are best near salt water.

Spring bronze one-door kit · 100 ft rolls · How to install spring bronze

Common questions

Is copper or bronze better for weatherstripping?

Bronze. Spring bronze is a hard-temper copper alloy made to flex every time the door opens and closes. Pure copper is softer and flattens sooner.

What alloy is spring bronze weatherstripping?

Typically alloy 220, about 90% copper and 10% zinc, very hard temper, about 0.009 inch thick.

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.