10/14/2026
Roofing cement may slow a leak temporarily, but it is rarely a lasting repair for a slate roof. ⚒️
Heavy tar patches can hide deteriorated metal, cracked slate, or failed joints without correcting the underlying problem. As the material ages and becomes brittle, water may find a new path—and the buildup can make proper repairs more difficult.
Removing failed patching and repairing the damaged slate or flashing addresses the source while preserving the surrounding roof whenever practical.
Here’s a job we completed after another “roofer” applied a coat of roofing cement to a valley to try to fix a leak. The valley continued to leak, and we were called in to assess and repair the situation. With a new 20oz copper valley installed, this homeowner has peace of mind for the next 80 years! Don’t trust the roofers with a pickup truck and a bucket of tar, call The Slate Guys for a professional repair for your historic roof.
Slate Roof Repair LLC
Historic Roofing Specialists
(413) 262-3662
📍 Serving Western Massachusetts & Connecticut
📩 Message us to discuss leak diagnosis, slate repairs, or custom copper flashing.