Slate Materials & Matching
Natural Slate vs. Synthetic Slate
Updated September 25, 2026
Short answer: Natural slate is real stone and can last a very long time. Synthetic slate is a manufactured product made to look like slate. It is lighter and often cheaper upfront, but it looks and ages differently, and may not be accepted on historic properties.
Side by side
| Natural slate | Synthetic slate | |
|---|---|---|
| Material | Quarried stone | Manufactured (often rubber or plastic blends) |
| Look over time | Weathers like stone | Depends on product |
| Weight | Heavy | Lighter |
| Repairs | Individual slates replaced | Follow the maker's rules |
| Historic homes | Usually preferred | May not be approved |
Mixing them
Patching a natural slate roof with synthetic pieces usually looks out of place and may behave differently. Matching natural slate is the usual approach for repairs.
Common questions
- Is synthetic slate allowed in Pittsburgh historic districts?
- It depends on the district guidelines and review. Check with City historic preservation staff before choosing.