Short answer: The right natural stone for your project is the one with test data that matches your climate and use. Four numbers matter most for outdoor stone: freeze-thaw performance, absorption percentage, compressive strength and flexural strength. Together they show whether a stone will hold up on your patio, pool deck or steps, long before it’s installed.
Most stone suppliers sell SKUs: pallets in a warehouse, a price per square foot and a delivery date. At Stone Atelier, the natural stone studio of Daydream Design & Build, we work as stone curators. Every stone we offer comes with real test data, and we stay involved through design, base and drainage, fabrication and installation.
What test data should you ask for?
| Test | What it tells you | Why it matters outside |
|---|---|---|
| Freeze-thaw | How the stone holds up through repeated freezing and thawing | North Georgia winters swing above and below freezing |
| Absorption % | How much water the stone takes in | Water inside stone expands when it freezes |
| Compressive strength | How much load the stone can carry | Patios, drives and steps carry people, furniture and equipment |
| Flexural strength | How well the stone resists bending and cracking | Large-format pieces, treads and coping span over the base |
These properties are measured with recognized test methods. Common ones include ASTM C97 for absorption, ASTM C170 for compressive strength, ASTM C880 and C99 for flexural strength, and EN 12371 for frost resistance. Ask any supplier which tests their stone has and for the report.
Why a photo and a price aren’t enough
Two stones can look almost identical in a photo and perform very differently outside. A stone that’s beautiful indoors may absorb too much water for a pool deck in a freeze-thaw climate. Test data is how you tell the difference before the stone is on your site.
Stone is only as good as what it sits on
Even the right stone fails on the wrong base. We consult on patio base and drainage so the stone performs the way the test data says it will. That means the right base build-up for the use, proper slope, and a plan for where water goes.
What a stone curator does
- Tests and selects stone for your climate and project
- Specs it with you: finish, thickness, edge and sizes
- Consults on base and drainage
- Helps with design and shop drawings
- Cuts to size from your drawings
- Visits the site when it matters
Frequently asked questions
What is the most important test for outdoor stone in North Georgia?
Freeze-thaw performance and absorption work together. Water that gets into stone and then freezes is what causes spalling and cracking, so a stone needs to handle both.
Can I see the test data before I buy?
Yes. We share the test data for the stones we offer. Ask us for the sheet on any stone you’re considering.
Do you only supply stone, or help with installation too?
Both. We supply stone for projects others are building, consult on base and drainage, and as a licensed Georgia Residential General Contractor, Daydream Design & Build can build the project too.
Ask for the data
If you’re choosing stone for a patio, pool deck, steps or walls, start with the data. Request samples and test sheets through our natural stone supplier page. Related reading: using the same natural stone inside and out.
Photos in this post show projects our stone traveled to.
