Yes, porcelain slabs can be cut, drilled and edged on site, but only with tools made for porcelain and with the slab fully supported. Straight cuts and small holes are routine; long mitres and sink cut-outs are usually better done in a fabrication workshop.
Porcelain is hard and brittle. It does not forgive a blunt blade, a sagging support or a rushed cut. If your customers' fitters are used to small tiles, they will need different tools and methods for slabs.
Cutting
Slabs are cut with diamond blades or with large manual cutters that score and snap the slab along a rail. Both methods need the slab flat on a supported surface for its full length.
- Rail cutters score the surface with a wheel, then snap the slab. They suit straight cuts on thinner slabs.
- Wet diamond saws, including track saws, suit thicker slabs and long precise cuts.
- Workshop bridge saws and waterjets suit complex shapes, cut-outs and mitres.
- Cutting from the face side and starting a cut slowly at the edge both reduce chipping.
Drilling
Holes for taps, pipes and sockets are made with diamond core bits, cooled with water. Fitters should drill without hammer action, at a steady speed, and support the slab under the hole.
Holes should not sit too close to an edge or a corner, because the narrow bridge of material can crack. The factory's installation guide usually gives a minimum distance. Ask for it.
Edging and cut-outs
Edges can be polished, bevelled, rounded or mitred. Mitred edges need a precise 45 degree cut and are best done on workshop machines. The body type matters here: a standard-body slab shows a different colour at a bullnose or bevel. Our guide on full-body porcelain slabs explains why.
Inside corners of cut-outs, such as sinks and hobs, should have a rounded radius. A sharp inside corner concentrates stress and is a common place for cracks to start.
Dust and safety
Porcelain contains crystalline silica. Dry cutting and grinding release fine silica dust, which is harmful to breathe. Most workplace safety regulators expect wet cutting or on-tool dust extraction, plus suitable respiratory protection.
Rules differ by country and change over time, so tell your customers to follow their local workplace safety rules. In Australia, for example, processing products with crystalline silica carries specific duties even though resin-free porcelain is outside the engineered stone ban. See sintered stone vs porcelain slab for that background.
What to ask the factory for
- An installation and fabrication guide in English, with recommended tools, cutting speeds and minimum hole distances.
- Guidance on support and handling for each size and thickness.
- Any limits on cutting near the edge or on the width of narrow strips.
- Advice on edge finishing for the body type you are buying.
Pass it on
Pass these to your customers with every order. Our guide on slab installation guidance for customers covers what else to include.
Next step
We collect fabrication and installation documents from the factory along with samples and test reports. To build a slab range your fitters can work with, book a free sourcing review.