I don't often get to see my work 16 years after installation. Most of the time I fabricate a cap or a dome, it gets installed, and I move on to the next job. But a while back I pulled up Google Street View on a commercial building in Allentown, Pennsylvania where I did one of the more involved projects of my career — a full standing seam copper dome on a historic brick building — and what I saw stopped me.
The copper had fully transformed. And it looked exactly the way it should.
The Project
The building at 458 Hanover Avenue is a classic early 20th century commercial brick structure — the kind with corbeled brick cornices, stone detailing, and architectural character that modern construction just doesn't replicate. The owner needed a new dome fabricated and installed on the corner tower. It had to match the building's historic character, hold up to the elements for decades, and look like it belonged there.
I fabricated a standing seam copper dome with a custom finial at the peak. Every panel was formed and fitted by hand. Getting the geometry right on a curved dome is one of those jobs that separates fabricators who understand metal from those who just cut and bend it. Each panel has to account for the curvature in two directions simultaneously, and the seams have to be tight enough to shed water for a lifetime.
What Copper Does Over Time
When I installed this dome, it was bright penny copper — warm, reddish-orange, unmistakably new. That's how copper starts. What most people don't realize is that what happens next is not deterioration. It's protection.
Copper oxidizes in stages. Within the first few years it darkens to a warm brown. Over the following decade it transitions through deeper browns and grays as cuprite and other stable oxides form on the surface. In coastal or high-humidity environments it eventually reaches the green patina most people associate with old copper — think the Statue of Liberty. In drier inland environments like the Lehigh Valley, it tends to settle into a deep charcoal gray-brown, which is exactly what you see on this dome today.
That dark surface isn't rust. It's armor. The patina is chemically stable and actually protects the copper underneath from further corrosion. A well-fabricated copper installation maintained properly can last well over a century.
16 Years Later
When I pulled up the Street View images from July 2024, the dome had fully matured into that deep pewter tone. The standing seam panels are still tight. The finial is still perfectly plumb. The dome sits on that corner exactly the way it did the day we finished — except now it looks like it's always been there. That's the goal with historic preservation work. You're not trying to make something look new. You're trying to make something that earns its place.
That's a job I'm proud of, and the building is better for it.
What This Means for Your Project
If you're working on a historic building and need custom copper fabrication — a dome, a cupola, a cap, decorative flashing, or architectural metalwork — this is the kind of work I've been doing since 1994. Every piece is fabricated by hand, to your exact dimensions, in my shop in Berlin, NJ.
Copper isn't the cheapest option. But when you're preserving a building that's meant to stand for another hundred years, it's the right one.