What sizes does terrazzo tile come in?

The Chinese standard enumerates them: lengths from 300 to 3200 millimetres, widths from 300 to 1800, thicknesses of 15, 20, 25, 30, 40, 50 and 60 millimetres. That is a real list rather than the custom-order answer most suppliers give, and it means a 3200 by 1600 by 20 panel is a standard-compliant product and not an exception.

Reference photograph of a terrazzo surface, s07. Not a photograph of our goods. — Floor laid in large modules beside a planted bed

Reference photographs. They show the material and the finish; they are not photographs of goods we made, and the colour on screen is not a colour-match.

The figures, and where each one comes from

Dimension	Enumerated values, millimetres
Length	300, 400, 500, 600, 800, 1200, 1400, 1600, 2400, 2700, 3000, 3200
Width	300, 400, 500, 600, 800, 1200, 1400, 1600, 1800
Thickness	15, 20, 25, 30, 40, 50, 60

Why the processes are not interchangeable

The large formats are limited by movement, not by size. NTMA, the American trade association, gives the convention: squares of four feet on centres or less are ideal, and rectangles up to about 25 square feet with an aspect ratio of no more than one-and-a-half to one are next best. Four feet is about 1220 millimetres, so the two systems are describing the same constraint from opposite ends: the American association names the preferred size, the Chinese standard lists what may be manufactured and leaves the joint spacing to the designer. Note also what the Chinese standard does not contain: GB 50209-2010 sets no figure for the spacing of divider strips at all, so a 3200 millimetre panel is compliant as a product and still needs a movement joint layout designed for it.

What these figures are, and what they are not

The size list is table 1 of JC/T 507-2022, and its own marking example confirms a 3200 by 1600 by 20 panel in high-performance cement artificial stone as a compliant product. The divider strip convention is from the NTMA Terrazzo Systems Reference Guide, which gives it in feet and square feet; the millimetre and square metre figures are our conversion of that and are not quoted from the guide. ⛔ We have not manufactured a panel of the largest format listed here and we do not claim a maximum panel size of our own.

Measured data sheets and test reports

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