The fiber glass mesh acts as a reinforcement of the plaster and prevents craks and clefts caused by displacement of the underlying elements (bricks, prefabricated or lightweight blocks, etc.) or by external agents.
The mesh width can vary according to the granulometry of the plaster: rough plasters require wider mesh, fine renders need to be reinforced with finer mesh.
Mesh shall be laid from top downwards on a fresh layer of mortar and then completely covered with the same material. On each side the mesh shall overlap by at least 10 cm. Blisters and wrinkles must be carefully avoided.