Shoptalk—deciphering architectural and historic preservation jargon one word at a time!
sheet copper that has been crimped such that the profile is corrugated
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Historically, crimped copper was not just an aesthetic choice, the crimping also made the sheet copper stronger. This allowed a lighter material to be used and sometimes it was used without sheathing to support it from the backside. That was the case at Grant Hall. Replicating the historic crimp proved to be challenge, modern crimped copper doesn’t have the same profile or pattern repeat. Several custom fabricators were contacted to find a crimper that matched the historic copper; Heather & Little, Ltd was found to have a crimper that was still capable of producing the full size sheets need for the project. Renaissance Roofing formed and installed the crimped copper.
Comparison on historic and modern crimped copper.