Custom Arched Chimney Cap — Built to Your Dimensions
The Arched Chimney Cap is a convex curved cathedral-style roof — a single arched panel that spans the full width of your chimney and rises to a peak at the center. On smaller caps the standing seams are fabricated separately and riveted on; larger caps have individual panels with seam spacing determined by the chimney's width. It's the right cap for chimneys on buildings with architectural character — historic homes, custom builds, churches, commercial masonry — anywhere the roofline deserves more than a box with a lid.
I fabricate every arched cap to your exact chimney dimensions by hand, here in Berlin, NJ — copper sheet cut and curved to shape, fitted with expanded stainless steel screen, assembled with copper and stainless steel rivets. Sizes from 20×24 up to 36×120 are priced on the calculator below. Wider than 36″? Call or text me directly — those are built-to-spec and quoted individually.
What It Actually Does
A properly fitted cap does four things a hardware store cover doesn't: it protects the entire chimney crown (not just the flue tile opening), it blocks animal entry with a heavy spark screen, it reduces wind-driven downdraft, and it contains embers from wood-burning fireplaces. The full-perimeter flange sits on the crown — crown repair runs $500–$3,000, and a cap that covers it correctly prevents all of it.
What is a chimney crown — and why yours may already be cracking →
Arched Cap Construction
The arch is fabricated from 16oz copper sheet, rolled and shaped to a true curve — not a bent angle or a folded peak, but a smooth radius that holds its form under load. The drip edge wraps the full perimeter of the chimney crown on side mount caps. The arch roof vents are on the two short ends only — expanded stainless steel screen is set into each end panel, with screen height at 75% of the width dimension. This gives you solid protection against wind-driven rain and debris from the long sides while maintaining full ventilation through the ends.
Every cap that leaves this shop I built myself. No production line, no subcontractors — one fabricator, one standard of work.
Specs
- Material: 16oz copper · Kynar aluminum (.032″–.040″) · 304 stainless steel (24 gauge) · Galvalume Plus (24 gauge)
- Screen: Expanded stainless steel — 18-gauge 304 (copper) · expanded aluminum (Kynar, Galvalume, stainless)
- Screen location: Short ends only — 2 sides
- Screen height: 75% of width dimension
- Minimum size: 20″ × 24″
- Maximum priced online: 36″ wide (wider caps quoted by phone)
- Mounting: Top-mount flange or side-mount — your choice
- Drip edge / flange depth: 2″ to 5″ — 3″ standard
- Lead time: Approximately 3–4 weeks
- Ships: Nationwide via LTL freight in custom wood crate
Have a Wood-Framed Chase?
If your chimney sits on a prefab wood-framed chase rather than masonry, you may need a chase cover in addition to this cap. The cap mounts on top of the chase cover — it doesn't have a flat bottom with pre-cut holes for your flue pipe(s). If there's currently no metal cover on your chase top, you need both.
Masonry chimney or wood-framed chase — how to tell the difference → | Browse custom chimney chase covers →
About Archaic Metal
I've been fabricating custom architectural sheet metal in South Jersey since 1994 — copper, Kynar aluminum, Galvalume, and stainless steel, all by hand. Every cap that leaves this shop I built myself. If you have questions about your chimney or which cap is right for it, message me or call. I personally review every order before fabrication starts — you won't be left guessing.
Phone: (609) 352-9840
Cap wider than 36″, or not sure what size you need?
Send me your measurements and I'll confirm everything before fabrication starts. No obligation.
Request a quote or call/text me directly: (609) 352-9840
What Customers Are Saying
"Fantastic fit and finish, excellent communication from start to finish. A trusted craftsman." — Charlie
"The chimney cap is absolutely gorgeous. The craftsmanship is incredible. I am beyond thrilled." — Carol
"Amazing quality. The custom chimney cap exceeded my expectations!!" — Johnny