Sandstone vs Limestone: Which Stone Is Better
So you're trying to pick between sandstone and limestone for some project. Maybe it's a patio, maybe it's a wall, who knows. Both are natural, both are sedimentary rocks, but man, they're not the same at all. Hardness, how much water they soak up, the look — totally different. Here's a real comparison, based on actual numbers, so you can figure out what works for you.
What is the Main Difference Between Sandstone and Limestone?
The big thing? What they're made of. Sandstone is basically tiny sand grains — mostly quartz — glued together with silica or calcium carbonate. Limestone, on the other hand, is almost all calcium carbonate, usually from crushed up shells and skeletons of ancient sea creatures. That difference in makeup changes everything: how hard they are, how they react to acid, how long they'll last.
Hardness and Durability Comparison
Sandstone wins on toughness, no contest. On the Mohs scale, quartz-based sandstone sits around a 6 to 7. Limestone? Pfft, more like a 3 or 4. That means sandstone doesn't scratch or chip as easily. Limestone's softer, sure, which makes it easier to carve into shapes, but it's way more prone to getting banged up.
| Property | Sandstone | Limestone |
|---|---|---|
| Mohs Hardness | 6-7 | 3-4 |
| Compressive Strength (MPa) | 20-170 | 15-80 |
| Water Absorption (%) | 1-8% | 0.5-15% |
| Acid Resistance | High (quartz-based) | Low (reacts with acid) |
Which Stone is Better for Outdoor Use?
If it's going outside — paving, cladding, garden walls — go with sandstone. Honestly, it's the better bet. It's denser, doesn't soak up as much water, so freeze-thaw cycles won't wreck it as fast. Limestone looks gorgeous, I'll give it that, but it weathers faster, especially if you get acid rain or harsh winters. That said, limestone is softer, so carving it into fancy decorations is way easier.
Which Stone is Better for Interior Use?
Inside, both can work, but it depends on what you want. Limestone gives you this soft, elegant vibe — great for bathrooms or fireplaces — but you better seal it, or acidic cleaners will etch it like crazy. Sandstone's more rugged, textured, good for floors or feature walls. Here's the thing: limestone gets wrecked by lemon juice or vinegar, no joke. Sandstone's way more forgiving.
Cost and Maintenance Considerations
Sandstone usually costs more. It's tougher to quarry, and the durability comes at a price. Limestone is everywhere, so it's cheaper upfront. Maintenance-wise? Sandstone doesn't need sealing as often, and cleaning it is a breeze. Limestone? Regular sealing, careful cleaning, or acid will eat it up. Sometimes, the long-term cost of maintaining limestone ends up being more than what you saved buying it.
Frequently Asked Questions
Can limestone be used in a kitchen?
Sure, you can, but I wouldn't in high-use spots. Limestone etches like crazy from citrus and vinegar, and it stains from oils and wine. If you're set on it, seal it constantly and clean spills right away. Sandstone's just more practical for countertops and floors in a kitchen.
Does sandstone require sealing?
Yeah, but not as often as limestone. Sandstone's naturally denser, but sealing helps keep stains and moisture out. A good impregnating sealer every 2-3 years is usually enough.
Which stone is better for a pool surround?
Sandstone, hands down. The textured surface gives you better grip when wet, and it doesn't react with pool chemicals. Limestone? Pool treatments like chlorine can damage it, and its smooth surface gets dangerously slippery.
How can I tell the difference between sandstone and limestone?
Try the acid test. Drop some diluted hydrochloric acid (or even vinegar) on the stone. Limestone will fizz and bubble like crazy — it's a chemical reaction. Sandstone either won't react or barely does, depending on what's binding it. Look-wise, sandstone feels grainy and sandy, while limestone is smoother and might have tiny fossil bits in it.
Checklist for Choosing the Right Stone
- Figure out where it's going: inside or outside?
- Think about acids, moisture, and freeze-thaw cycles.
- How much traffic? Will it get scratched or chipped?
- What's your budget for buying it and keeping it up?
- Pick sandstone if you want durability and low maintenance.
- Pick limestone for decorative spots with low traffic, where you want a softer look.
Short Summary
- Durability Winner: Sandstone is significantly harder and more resistant to wear, scratches, and freeze-thaw damage than limestone.
- Best for Outdoors: Sandstone is superior for patios, pool surrounds, and cladding due to its slip resistance and chemical stability.
- Best for Interiors: Limestone offers a softer aesthetic but requires high maintenance; sandstone is more practical for floors and countertops.
- Cost vs. Value: Limestone is cheaper upfront, but sandstone's lower maintenance and longer lifespan often provide better long-term value.
