Slate Roofing Case Studies
True slate roofs designed, repaired and rebuilt as long-lived assemblies — not disposable coverings.
These projects show how Heritstone approaches slate fields, valleys, ridges and copper integration
on homes built for heritage materials.
Case Study 1 — Valley & Ridge Restoration on a Heritage Gable
A heritage slate roof with failing valleys and ridge details was leaking despite most of the field
slate still being sound. We restored the high-risk geometry and kept the original slate where it belonged.
- Existing failing metal valleys removed
- New 20 oz copper valleys fabricated with correct open exposure
- Compromised slates along valley lines replaced with matching slate
- Ridge slate reset with improved nailing pattern
- Bib flashings installed at every critical intersection
Result: A watertight roof geometry with original slate preserved and valley failures eliminated.
Case Study 2 — Full Re-Slate on an Estate Roof
The existing slate had reached the end of its useful life, and the home required a full re-slate to
protect the structure for the next generation.
- Old slate stripped with careful salvage of usable pieces
- Decking inspected, repaired and re-fastened
- New underlayment and copper eave details installed
- New slate field installed in coursed pattern appropriate to the house
- Ridges, hips and transitions detailed in copper and slate
Result: A complete, disciplined slate roof intended to serve as the final roof system on the home.
Case Study 3 — Complex Roof Geometry Over Additions & Dormers
Multiple additions over decades left the roof with an irregular patchwork of pitches and tie-ins.
The slate and copper detailing no longer drained correctly.
- Entire roof geometry mapped and re-drawn
- Copper crickets and saddles designed at every dead valley
- Slate fields re-laid to follow corrected drainage paths
- Step flashings rebuilt where roof met masonry walls
- All penetrations detailed with formed copper pans and collars
Result: A unified slate and copper assembly that treats the entire roof as a single, disciplined system.
Case Study 4 — Porch & Bay Roof Conversion to Slate & Copper
The main roof was slate, but the porch and bay roofs had been replaced with temporary materials.
We converted them back to the correct heritage language.
- Removal of asphalt and light metal coverings
- Decking corrected and pitched for proper drainage
- Slate installed in patterns scaled to the smaller roof areas
- Continuous copper eaves, drip edges and seams formed
- Seamless visual match to the main slate roof massing
Result: Secondary roofs brought back into the same heritage vocabulary as the main roof.
Case Study 5 — Emergency Slate Stabilization & Long-Horizon Plan
A slate roof had localized failure and active leakage but was largely salvageable. The owner wanted to
stabilize the roof now and plan for a long-horizon restoration.
- Immediate leak points identified and temporarily protected
- Broken and slipped slates replaced with in-kind material
- Critical flashings and valleys rebuilt in copper
- Condition report created for each roof plane
- Phased restoration plan developed for the next 10–15 years
Result: Urgent water entry stopped and a disciplined slate restoration plan set in place.
Slate & Copper Materials
- True slate only — no synthetic slate or imitations
- Matching regional slate where available, or compatible alternatives
- 20 oz copper for valleys, ridges, eaves, crickets and pans
- Heritage-appropriate underlayment systems beneath slate
- Copper nails or stainless fasteners as conditions require
- No nail-through flashings, sealant patches or asphalt overlays
Request a Slate Roof Assessment
A slate roof should be treated as a structural assembly, not a finish. A Heritage Site Visit reviews the
slate field, valleys, ridges, penetrations and copper work to determine what can be preserved, what must
be rebuilt, and how to plan a long-lived roof.
Call: 440-448-5057
Email: contact@heritstone.com