How does the porosity of travertine compare to marble for outdoor seating durability?

When selecting natural stone for outdoor seating, understanding porosity and durability is crucial. Travertine, a sedimentary rock, is naturally porous due to its formation process, which leaves small cavities and pits. This porosity makes travertine more susceptible to water absorption and staining compared to marble, a metamorphic rock with a denser structure.

Marble, while less porous, is prone to etching from acidic substances like rain or spilled drinks. For outdoor seating, travertine's porosity can be mitigated with proper sealing, enhancing its resistance to weathering. However, marble's lower porosity doesn't always translate to better durability, as its softer composition makes it more vulnerable to scratches and wear over time.

In summary, travertine requires more maintenance due to its porosity but can be durable with regular sealing. Marble, though less porous, may not withstand heavy outdoor use as well. The choice depends on climate, usage, and maintenance commitment.