4cm or 6cm steel mesh should be paved in it. If no one is on the roof. But generally, whether to use steel mesh depends on the design of design unit. It shoule be covered with fine aggregate concrete protective layer. If the roof loads people, it does not need mesh after paving thermal insualtion board. But it is OK to cover fiberglass mesh on cement mortar protective layer in order to resist cracks. And decorate the roof.
What is above roof insulation layer is slope and leveling blanket, so it doesn't need to use mesh. The most ordinary mesh is wall insulation board. Roof insulation is only levled or flattened, let alone stel mesh. Then it is waterproof?layer and protection layer. Protection layer is for waterproof layer. Thermal?mortar will be used. But do not pave tile. Roof does not need mesh.
