Revisions log for Answer #68
This is the answer to the question What are the features of a terrace paved with natural stone (e.g. porphyry)?
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2022‑04‑15 23:01
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Just as important as the frost resistance of patio slabs is the surface of the stone (slip resistance). Stones with polished surfaces should not be used, as they can cause slipping when wet.
The properties of porphyry are high compressive strength, abrasion resistance, insensitivity to acids, and long life.
Not all porphyry is frost resistant, depending on where it is mined.
Sandstone is generally frost resistant, but not resistant to de-icing salt.
Resistance, durability, and good thermal conductivity are additional properties.
However, sandstone is usually very susceptible to staining.