What sizes and thicknesses of Giallo Siena marble are there?
We hold 15, 18 and 20 mm as standard stock.
Answer
Why does a Giallo Siena marble slab weigh less than it should?
Sizes and formats, and what is held
Because calibration takes material off. A slab is ground to a stated thickness, and grinding removes one to two millimetres, so a weighed Giallo Siena marble slab reads slightly below the figure calculated from its nominal thickness.
The figures
| Fact | Value | Source |
|---|---|---|
| Calibration | Grinding to a stated thickness takes 1–2 mm off the nominal thickness | Calibration figure |
| Nominal weight at 15 mm | 40.65 kg/m² | Derived from the published apparent density |
| Nominal weight at 18 mm | 48.78 kg/m² | Derived from the published apparent density |
| Nominal weight at 20 mm | 54.20 kg/m² | Derived from the published apparent density |
Why this stone behaves this way
The published density of 2710 kg/m³ is a property of the stone, and the nominal thickness is a property of the order. Calibration is the process that reconciles them, and it removes material in the doing.
What these figures are, and what they are not The nominal weights are calculated from a published density and a nominal thickness. A certificate issued for the block governs, and the calculator on this site uses the same published figures.
Where these figures come from
- S1 granitalsiena.com — Giallo Siena marble technical sheet (EN standard test values; Politecnico di Torino marble laboratory)
- S6 StoneContact — Giallo Siena Unito and Broccatello di Siena entries, carrying Università di Pisa - Politecnico di Torino test values for the material
- S16 the architect complete specification guide to marble (bookmatching, edge profiles, calibration, finish behaviour)
Where to go next
On the same subject
More questions about Giallo Siena marble
How much does Giallo Siena marble weigh per square metre?
40.65 kg per square metre at 15 mm, 48.78 kg at 18 mm and 54.20 kg at 20 mm, at the published apparent density of 2710 kg/m³.
This answer sits on the Sizes and formats, and what is held page, with the rest of the questions about it.
Sizes and formatsAsk for a price
A thickness, a format, a finish, a quantity and a destination will get you a quotation for Giallo Siena marble.
Why does a Giallo Siena marble slab weigh less than it should?