L’opus spicatum – is an ancient method of paving or bulding using stones and interleaving them in a zig-zag fashion. The joints go both horizontal and vertical.
The technique was developed during Roman times as a means of paving roads, but then in the Middle Ages, artisans tried the technique on walls with great success – particularly retaining walls as the interleaving of the stone created a strong structure.
Then, in Medieval times, the French artisans used to clad the outside of noble city houses with spicatum laid bricks and encased them in wooden frames – designs houses made famous in cities such as Carcassonne. Way down in the south-west in the Dordogne, there are many versions of spicatum clad homes.
An ancient art – sadly practiced no longer.