Roger builds many architectural features using the dry-stone technique, including pebbling, slab-paving and walls. This involves the use of limestone, sandstone, granite, basalt, shale or slate, either freshly quarried or salvaged from ruined structures. He works with traditional tools, such as dry-terrace waller’s hammers, stone-cutting… tools, sledgehammers and hoes or picks. For heavier work he sometimes uses mechanical tools before laying the stones by hand.

Dry-stone walling is used to retain earth or to delimit plots of land, in stone huts (with vaulted or slabbed roofing, always built with converging courses) and in benches, livestock pens or water channels. In determining a wall’s dimensions and thickness, account must be taken of its final height and the type of stone to be used. For retaining walls, the volume of earth to be retained must also be kept in mind. Dry-stone walls are also excellent drainage systems.

Given its great thermal inertia, stone absorbs heat well in summer, without using cement, allowing the wall to be properly aerated. In winter the stone is heated by the sun, insulating the building interior.

Though the techniques used have been influenced by English, Mallorcan and Catalan building traditions, and more up-to-date methods are now employed to determine wall dimensions, traditional vernacular knowhow remains the essence of the craft.

Roger also works with wicker for architectural uses, making screens, fences, shade covers or ventilated walls in which air flows freely between the masonry and a wicker fabric.