To hold large stones in place, stonemasons attach brackets to the stone and weld or bolt them to anchors in the wall. Finally, masons wash the stone with a cleansing solution to remove stains and dry mortar. When setting stone floors, which often consist of large and heavy pieces of stone, masons first trowel a layer of damp mortar over the surface to be covered. Using crowbars and hard rubber mallets for aligning and leveling, they then set the stone in the mortar bed. To finish, workers fill the joints and wash the stone slabs.
Masons use a special hammer and chisel to cut stone.
They cut it along the grain to make various shapes and sizes. Valuable pieces often are cut with a saw that has a diamond blade. Some masons specialize in setting marble which, in many respects, is similar to setting large pieces of stone. Bricklayers and stonemasons also repair imperfections and cracks or replace broken or missing masonry units in walls and floors. Most nonresidential buildings are now built with prefabricated panels made of concrete block, brick veneer, stone, granite, marble, tile, or glass.