Natural stone patios look great and add real value to a home -- but they require different handling than concrete or pavers. Use the wrong PSI or the wrong cleaner on marble or travertine and you'll etch the surface permanently. Here's the stone-by-stone guide to pressure washing natural stone without causing damage.

The Quick Answer

PSI limits vary significantly by stone type. These are your ceilings -- always start lower and work up only if needed:

Granite: 1,200-1,500 PSI (dense, handles moderate pressure well)
Basalt/Slate: 1,000-1,500 PSI (similar density to granite)
Travertine: 800-1,200 PSI (porous, acid-sensitive)
Limestone: 800-1,000 PSI (soft, etches easily)
Marble: 800-1,000 PSI max (never use acid-based cleaners)
Nozzle: 25-40 degree fan tip only, 12+ inches from surface

One rule applies to all natural stone: no acidic cleaners. Vinegar, citrus-based products, and anything with a low pH will etch the surface permanently, leaving dull spots that can't be fixed without professional restoration.

Why Natural Stone Needs Special Care

Concrete can handle 3,000+ PSI without a problem. Natural stone can't. Here's why.

Most natural stones are porous -- they have microscopic channels throughout the material. High pressure forces water into those pores. When the water expands and contracts with temperature changes, it can crack the stone from the inside. Over time, this destroys the surface even if it looks fine after the initial wash.

A second problem is chemical etching. Marble, limestone, and travertine all contain calcium carbonate. Acidic cleaners dissolve that calcium carbonate on contact, leaving a permanently dull, rough mark that's impossible to remove without grinding and repolishing -- a job that costs $5-15 per square foot.

Stone-by-Stone Cleaning Guide

Granite and Basalt

These are the safest natural stones to pressure wash. Granite is dense and relatively non-porous, which means it handles higher pressure and mild detergents without damage.

Use 1,200-1,500 PSI with a 25-degree fan tip. Keep 12-18 inches from the surface. A pH-neutral stone cleaner works well. Rinse thoroughly to avoid leaving soap residue, which attracts dirt and can cause long-term discoloration.

Travertine

Travertine is beautiful but highly porous. It's formed from sedimentary limestone, so it carries the same acid sensitivity as marble -- just at a lower price point per square foot.

Keep pressure at 800-1,200 PSI. Never use vinegar, citrus-based cleaners, or bleach. Use a pH-neutral cleaner specifically formulated for travertine or natural stone. Keep the nozzle at 12+ inches and use a 40-degree tip for extra spread.

After cleaning, sealing travertine is essential. The open pores will reabsorb dirt within weeks if left unsealed.

Marble

Marble is the most sensitive stone you'll encounter outdoors. Never use acidic cleaners -- not even products labeled "stone cleaner" without verifying the pH is neutral (7.0).

Keep pressure at 800-1,000 PSI max. Start lower (600 PSI) if the marble has a polished finish. Use a 40-degree fan nozzle and stay 18+ inches from the surface. Rinse immediately after cleaning -- don't let any cleaner sit and dry on marble.

Limestone and Sandstone

Both are soft and porous. Treat them similarly to marble: 800-1,000 PSI, 40-degree nozzle, pH-neutral cleaner, no acids. Sandstone is especially sensitive to focused pressure -- keep to 600-800 PSI and use a wide sweeping motion rather than focusing on one spot.

What to Avoid on All Natural Stone

Acidic cleaners: Vinegar, citrus, muriatic acid -- all etch stone permanently
Bleach on polished stone: Can discolor and damage the finish
Zero-degree (red tip) nozzle: Too concentrated for any natural stone
Turbo/rotating nozzles: Too aggressive for stone surfaces
Getting too close: Stay 12-18 inches minimum from the surface
Blasting out joint sand: High pressure removes polymeric joint sand between pavers -- factor in replacement cost or charge for it separately

Sealing After Cleaning

Cleaning is only half the job on natural stone. Sealing protects the surface, prevents future staining, and makes the next cleaning faster and easier. Check out our guide to sealing surfaces after pressure washing for the broader process.

Here's the sealing schedule and cost by stone type:

Sealing cost: $1-3 per square foot professionally applied
Full clean + seal job: $300-550 for a standard patio
Travertine and limestone: Reseal every 2-3 years
Penetrating sealers (all stone): Every 3-5 years
Marble: Reseal every 6-12 months (highly sensitive to staining)
Granite: Reseal every 3-5 years (less porous, holds up longer)

Sealing is an easy upsell after every stone cleaning job. Most homeowners with high-end stone say yes to: "Now that it's clean, do you want to seal it so it stays this way longer and repels stains?"

Pricing Natural Stone Cleaning

Natural stone commands a premium over standard concrete cleaning. The lower PSI and specialized chemicals require more care, which takes more time. Price accordingly.

Granite/basalt cleaning: $0.15-0.25 per sq ft
Travertine/limestone cleaning: $0.20-0.35 per sq ft
Marble cleaning: $0.25-0.40 per sq ft
Minimum charge: $150-200 for any natural stone job
Sealing add-on: $1-3 per sq ft on top of cleaning

A 500 sq ft travertine patio cleaned and sealed runs $700-1,400. That's a meaningful job from a single property.

Bottom Line

Natural stone isn't concrete. Match your PSI to the stone type, stay off the acidic products, use a fan tip from a safe distance, and always seal after cleaning. You've got a premium service that earns more per job than a standard driveway wash -- and homeowners with natural stone patios will pay for it.

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Pressure Washing Natural Stone: Marble, Granite and Travertine Guide (2026)