What is the slip resistance of honed Giallo Siena marble?
Every finish, with an honest verdict
43 USRV dry and 16 USRV wet on the honed surface, published to EN 14231-04. The wet figure is the one a bathroom or an entrance has to be designed around, and it is a factor of two and a half lower than the dry one.
The figures
| Property | Value | Source |
|---|---|---|
| Slip resistance, honed, dry | 43 USRV | EN 14231-04, published technical sheet |
| Slip resistance, honed, wet | 16 USRV | EN 14231-04, published technical sheet |
| Calcite content | 95–98 per cent | published petrographic note |
Why this stone behaves this way
A honed surface is ground, not polished, so it carries a fine texture that gives a dry grip. Water fills that texture and the grip falls with it. That is why the wet figure is published next to the dry one and why a wet-area floor is specified differently from a dry one.
What these figures are, and what they are not These are published values for the material, not a certificate for the slab you are buying. A certificate issued for the block governs, and a floor that is sealed and then wet has to be assessed as it is actually laid.
Where these figures come from
- S1 granitalsiena.com — Giallo Siena marble technical sheet (EN standard test values; Politecnico di Torino marble laboratory)
Where to go next
This answer sits on the Every finish, with an honest verdict page, with the rest of the questions about it.
FinishesAsk for a price
A thickness, a format, a finish, a quantity and a destination will get you a quotation for Giallo Siena marble.
What is the slip resistance of honed Giallo Siena marble?