Real Copper Post Caps vs. Cheap Fakes

It’s impossible to make a genuine copper-clad post cap for $20 and if you’ve bought one at that price and watched the finish start peeling within a year or two, that’s exactly what’s happening. Real copper doesn’t delaminate from a base metal the way cheap immitation products do.

What’s sold as “copper” post caps at most big box stores is typically an anodized coating over a cheap tin core. The coating corrodes off, leaving you with the plain tin underneath, not the material you thought you paid for. Real copper turns green as it ages, then a greenish grey over years. 

Authentic copper caps do exist through specialty retailers, but it’s worth verifying before buying. A simple test: scratch the finish somewhere inconspicuous. Real copper is the same color all the way through, not just on the surface. Genuine copper caps typically run $60 or more which is noticeably pricier than the imitation, but for good reason.

Real copper ages by developing a green patina as it oxidizes, and it essentially doesn’t rot, not on any timescale that matters to a homeowner. If a copper post cap seems unusually cheap, that’s the signal to check before installing it, not after.

See how details like these come together in a full design on our deck design services page.