Marble Slabs vs Tiles: Sizes and Thickness
Three ways to buy the same stone
Every Egyptian marble or granite leaves the factory in one of three forms. Slabs are large sawn sheets, finished on one face, that your fabricator cuts locally. Tiles are modular pieces in repeating sizes, calibrated and finished, ready to lay. Cut-to-size is anything made to your drawing: stair treads, vanity tops, sills, cladding panels, coping. The choice decides who takes the cutting waste, how much labour happens in Egypt versus on site, and how precisely you need to specify.
The European standards draw the line differently from trade language: EN 12057 treats a tile as 12 mm or less thick and no more than 610 mm along any side, and EN 12058 treats anything thicker as a slab, whatever its size. Most buyers still call a 60 x 60 cm piece at 2 cm a tile, so when you quote a standard, say which one and what you mean.
Slabs: gang-saw slabs and block-cutter strips
Two machines turn a quarry block into slabs. A gang saw or multi-wire saw drops a set of blades or wires through the whole block at once and produces full-size slabs, commonly about 250 to 355 cm long by 150 to 210 cm high, in 2 cm for most markets and 3 cm for the United States. A block cutter runs circular diamond blades through the block and produces long, narrow pieces called strips or cutter slabs, typically 60 to 105 cm wide and 137 to 361 cm long, from 16 and 18 mm up to 2, 3 and 4 cm thick.
Block cutters are cheaper to install and run, so cutter material is the more common and lower-priced product; one producer puts gang-saw slabs 30 to 100 percent above cutter slabs of the same stone, cut from the same blocks. Egyptian factories run both: a 2018 report from a marble factory in the Shaq El Thoban cluster near Cairo counted seven new gang saws and five block cutters on one site. Ask for gang-saw slabs when a bookmatched wall, a large island or a floor must read as one piece, since larger slabs give more consistent veining across matched pieces; for stairs, vanities, counters under about 280 cm, cladding bands and tiles, strips waste less and cost less. The trade-offs: cutter slabs carry an entry gouge a few millimetres deep along one edge that is trimmed in fabrication, while gang-saw slabs warp slightly more, about 1.5 to 2 mm on average against 1 to 1.5 mm, and up to 4 to 5 mm on softer stones.
Tiles: thicknesses and formats
Natural stone tiles are produced in 1, 1.2, 1.5, 2 and 3 cm, with 2 and 3 cm the usual slab thicknesses. Egyptian exporters typically list Galala and the other beige limestones in 1.5, 2 and 3 cm. Producers advise choosing thickness by the hardness of the stone and the use: heavier traffic, exterior steps and softer stones push the thickness up, while wall cladding can go thinner.
Common metric formats are 30 x 60, 40 x 40, 40 x 60, 40 x 80, 60 x 60, 60 x 90, 80 x 80, 90 x 90 and 100 x 100 cm; imperial markets order 12 x 12, 12 x 24, 18 x 18 and 24 x 24 inches. Not every size exists in every stone, so ask for the sizes actually in production for the colour you want.
Tolerances: what is realistic
Natural stone is not ceramic, and tolerances need to be written down rather than assumed. EN 12057 and EN 12058 set no pass or fail limits; they require the producer to declare measured values, so a declaration tells you what was measured, not whether it suits your project. Published supplier figures give the scale: for raw slabs, length within ±2 to 5 cm, width within ±1 to 3 cm and thickness within about ±1 mm, plus the warp figures above. Calibration grinds pieces to a consistent thickness before finishing; if you need calibrated tiles, say so in the order.
For cut-to-size work, one fabricator states that all dimensions are nominal and may shift in production, with an average tolerance of a quarter to three-eighths of an inch (about 6 to 10 mm) for carved and dimensional stonework. Sawn thickness is usually quoted far tighter, around ±1 mm, but any figure is only binding if it is in the order. Before production, agree in writing the length, width and thickness tolerances, the finish, the acceptable colour range and the points at which you will approve material.
How to write a cutting list
A cutting list turns drawings into a document the factory can price and cut from. The traditional stone specification describes it well: cutting and setting drawings show the sizes, sections and dimensions of each stone, the arrangement of joints and anchoring; every stone on the setting drawings carries a corresponding number marked on an unexposed face; and no cutting starts until the drawings are approved. Once approved, dimensions are locked and fabricators will not accept changes, so review every figure before signing.
In practice, send a spreadsheet with one row per piece: a piece ID matching the drawing, quantity, finished length, width and thickness in millimetres, stone and grade, face finish, which edges are visible and how they are finished, any holes or cut-outs, and a drawing reference. Group pieces by room or elevation, state whether dimensions are finished stone sizes or include the joint, and mark bookmatched or sequence-matched pieces so they are cut from consecutive slabs. Give each group the tolerance it needs; a stair tread and a cladding panel are not the same. Send the list with the drawings and the reference sample, and ask the factory to return it marked up, confirming each piece. For the slab sizes, tile formats and thicknesses currently in production for a particular Egyptian stone, contact us.
Stones in this guide
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