Valleys, dormers, chimneys, and roof-to-wall transitions often determine whether a slate roof sheds water properly. Copper can be part of a durable assembly, but material compatibility, seams, movement, and detailing matter as much as appearance.
Identify the exact assembly
A copper valley replacement is not the same scope as a standing-seam bay roof or chimney flashing repair. Ask which metal components are affected, what adjacent slate must be removed, and how the new work integrates with masonry, underlayment, and existing metal.
Discuss compatibility and movement
The National Park Service treats slate, flashings, gutters, and downspouts as a connected water-shedding system. Ask how the proposed metal choice avoids incompatible connections and accommodates movement. Do not assume a cosmetic coating or surface sealant corrects an underlying flashing defect.
Specify craftsmanship in the quote
Request metal specification, joint approach, attachment, counterflashing where applicable, adjacent material restoration, and access protection. Ask whether patina variation is expected and how runoff affects nearby surfaces. Confirm who handles associated masonry and any concealed damage discovered during opening.
A FEW CONSIDERATIONS
Before we begin.
Can sound slate be kept while flashing is replaced?
Often that is a goal, but access and slate condition determine feasibility. Ask how surrounding slate will be removed, stored, assessed, and reinstated during metalwork.
How do I request a consultation?
Share your town and project needs through the form. New England Slate Pros is an independent referral site; provider coverage, credentials, and availability must be confirmed. Submission does not book work.
Sources & further reading
General planning information, not technical design or legal advice. Confirm current requirements with your town and qualified professionals.