As a rule, they use a fiberglass for applying a plaster layer with a thickness of a few millimeters to a couple of centimeters. The grid itself should be durable, dense enough, the size of the cell from 4-5mm, resistant to the effect of a humid environment. Before laying the grid, it is necessary to calculate what width by fragments will have to lay its canvas, and it is worth considering a small supply in the overlap of one fragment on the other.