Slate
Layered, matte, and grippy underfoot.
Slate is a fine-grained metamorphic stone that splits into flat sheets. Its cleft surface is naturally slip-resistant, making it a favorite for floors, fireplaces, and roofing.
Telltale traits
- layered cleft texture
- dark gray/charcoal/green tones
- matte finish
Best for
- • Entryway floors
- • Fireplace hearths
- • Roof tiles
- • Outdoor steps
Avoid for
- • Polished elegant looks
Cleaning routine
Daily
Sweep or dust mop; mild stone cleaner with water.
Weekly
pH-neutral cleaner; dry buff.
Deep clean
Apply a slate enhancer/sealer to restore color.
Sealing
Yes — Every 1–3 years
Color-enhancing sealer revives faded slate.
What to avoid
Acidic cleanersOil-based soapsWax buildup
When to call a pro
Call a pro for cracked tiles or significant flaking.
Safe products & ingredients
Stone family: Silica-based (acid-tolerant)
Use these products
- • pH-neutral stone cleaner (Granite Gold, MB-5, StoneTech Revitalizer)
- • Mild dish soap (a few drops in warm water) for occasional cleaning
- • Penetrating impregnator sealer every 1–3 years
- • Isopropyl alcohol (50/50 with water) for disinfecting counters
Look for these ingredients
- • Neutral pH surfactants
- • Isopropyl alcohol up to 50%
- • Hydrogen peroxide 3% (spot use for organic stains)
- • Fluoropolymer or silane/siloxane sealer chemistry
Never use on this stone
Avoid these products
- • Bleach and ammonia-based sprays used daily
- • Acidic bathroom cleaners (CLR, Lime-A-Way) on polished finishes
- • Wax or topical 'shine' sprays — they trap haze
- • Vinegar — it won't etch quartzite/granite quickly but degrades sealers
Scan labels for these ingredients
- Sodium hypochlorite (bleach) in repeated daily use
- Ammonium hydroxide (ammonia) in repeated daily use
- Hydrofluoric acid (in some rust removers) — destroys quartz
- Silicone polish additives — leave a residue under sealer
Do's and don'ts at a glance
Do
- Wipe daily with neutral cleaner or soap-and-water
- Disinfect occasionally with diluted isopropyl alcohol
- Test sealer yearly with a water bead
- Use a cutting board to protect knives, not the stone
Don't
- Don't rely on bleach or ammonia for daily cleaning — they strip sealer
- Don't put a hot pan on a sealed area repeatedly — heat shortens sealer life
- Don't use rust removers without checking they're hydrofluoric-acid free
- Don't ignore a faded water bead — that's the cue to reseal
Frequently asked questions
Why is my slate flaking?
Softer slates can shed thin layers — usually cosmetic. A penetrating sealer slows it.
Can slate fade outdoors?
Some slates fade in UV. A color-enhancing sealer revives the original tone.