In Xinjiang, it is strange to keep warm with 30mm extruded board. If you go further south, this thickness is very common, and anchor bolts are installed. 1. Try to choose the extruded board with better quality. The extruded board with more recycled materials is too brittle, and the board with less recycled materials is not brittle. 2. Pay attention to the smoothness of the base during construction, and try to use small boards with poor smoothness. This can prevent the problem that the cavity behind the board is too large. 3, training workers during construction, don't use too much force when installing the anchor bolt, the surface of the anchor bolt is slightly lower than the insulation board.