Splitting and dressing degrees: the stonemason's techniques
From raw block to finished surface — step by step
The stonecutter's work does not begin with finishing, but with the block. Before any surface can be freely cut out, the stone must be split and divided correctly — and this requires understanding how this particular stone will break. Then comes the series of finishing grades, from rough splitting to the finest finish.
§Splitting blocks
Splitting is dividing a stone block along its natural or desired break surface. This can be done manually with wedges and rims that are driven into a row of holes along the line the stone is to be divided on so the pressure accumulates and the stone breaks cleanly. Today manual splitting is often supplemented by machine splitting where stone and granite blocks are divided with machine power while the principles behind — following the stone's veins and finding the correct stress line — are the same as in the craftsman's earliest days.
- 01Wedge and rim for manual splitting along a set line
- 02Machine subdivision of blocks in granite and other hard stone types
- 03Angle grinder for initial cutting work
- 04Understanding of the stone's petrological composition is crucial before splitting
§Dressing degrees — from rough to fine
When the piece is split the surface is worked through a series of roughing grades — each with its own name tool and expression. The grade is chosen based on the piece's function: a stair surface often needs to be skid-resistant and rough while an inscription or visible facade surface requires finer finish.
| Dressing degree | Characteristic |
|---|---|
| Spidshugning | Coarse, initial hewing with point chisel — removes most surplus material |
| Picking | Uniform, corrugated surface struck with a stonemason's hammer with toothed face |
| Pointed tool chiseling | Finer fluted pattern than hand-carved, executed with a fluting hammer/fluting iron |
| Scoring | The surface is worked with sharp parallel grooves in a specific pattern |
| Toothing | The surface is chipped with a toothed chisel creating a regular tooth pattern |
| Curb setting and alignment | The final steps where edges are straightened and surfaces are aligned with each other |
§Decorative carving and pouncing tool
With figure carving and decorative work, measurements are transferred from a model or sketch to the stone often using a pointing apparatus that allows the stonemason to transfer precise points from the template to the workpiece. It is a technique that requires both good handiwork and an understanding of the characteristics of styles so the result fits the building or monument it will be part of.
CNC equipment has today taken over some of the rough work and a CNC-treated surface often needs finishing by hand so it gets the right appearance and meets the requirements for the specific task. The skilled stone mason therefore masters both the classical hand technique and the modern machines — and knows when each is the right choice.