Slate
Black Slate
China / India
Slate
Roofing Slate
USA (Vermont / Pennsylvania)
ASTM C629Heat ResistantFrost ResistantAcid SensitiveSofter Surface
Roofing Slate
Photo coming soon
HardnessMedium(2.5–4 Mohs)
SoftHard
Acid SensitivityModerate Risk
SafeHigh Risk
Verify Before You Buy
Slab Yard Diagnostic Protocol
Run a quick verification with your Stone ID Kit to confirm the slab matches its label. The two-test routine (scratch + acid) catches most identification errors in the trade.
From your Stone ID Kit
Glass tileHCl dropper bottle (5–10%)
The full step-by-step protocol — including expected results and red flags — is included in your downloadable Buyer's Guide.
Stone TypeSlate
Geological NameSlate
OriginUSA (Vermont / Pennsylvania)
ASTM SpecificationASTM C629
ClassificationSiliceous (most)
Available FinishesHoned (Matte), Brushed
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🏔️
Natural Cleft Surface
Slate can be left with its natural cleft (split) surface for a textured, organic look, or gauged/calibrated for a flatter profile. Natural cleft provides excellent slip resistance for exterior use.
🔬
MB Stone I.D. Kit — Test Your Stone
Not sure what stone you have? This kit includes the tools professionals use to identify stone type, test acid sensitivity, check absorption, and determine the right care products.
Shop Stone I.D. Kit — $139.97HardnessMedium(2.5–4 Mohs)
SoftHard
Acid SensitivityModerate Risk
SafeHigh Risk
MEDIUM — some slates etch; test first
🔥Heat Tolerance
~400°F
💧Sealer
Yes (penetrating)
Technical Details
ASTM SpecificationASTM C629
Mohs Hardness2.5–4
Absorption0.1–0.45%
Density (pcf)167–180
Compressive Strength (psi)9,000–20,000
Flexural Strength (psi)C120
Abrasion Resistance (Ha)N/A
Thermal Tolerance~400°F
ClassificationSiliceous (most)
Geological NameSlate
OriginUSA (Vermont / Pennsylvania)
Where can you use Roofing Slate?
Tap an application to see the full recommendation.
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Interior
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Exterior
Recommended Conditional Not Recommended
Care Instructions
Maintenance recommendations for Roofing Slate
🧹 Daily Cleaning
- Wipe surfaces with a soft, damp cloth or microfiber towel
- Use a pH-neutral stone cleaner — never use acidic or abrasive products
💧 Sealing Schedule
- Sealer type: Yes (penetrating)
- Seal every 1–2 years for normal residential use
- Test with water drops — if absorption occurs within 10 minutes, it's time to reseal
- Always clean the surface thoroughly before applying sealer
- Allow sealer to cure fully before using the surface (typically 24 hours)
⚠️ Warning Signs — Time to Call a Pro
- Dull spots or rings where liquids have sat on the surface
- Visible cracks, chips, or separating seams
- Discoloration or staining that won't clean away
- Surface feels rough or gritty in areas that were previously smooth
- Grout deterioration around the stone edges
🛒 Recommended Products
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pH-Neutral Stone Cleaner
For daily cleaning. Avoid acidic or alkaline cleaners.
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Impregnating Sealer
Penetrates the stone to protect from within. Apply annually.
Need professional help?
Get a free consultation from Sureshine’s stone care experts.
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