First of all, on-the-spot investigation: the structure of the building, the local wind, the situation around the building, whether it is in the air outlet, etc. After the construction drawings are made, the main problems are rooting: if the roof structure is not good, cement beams must be placed on the roof before construction can be carried out under the condition of complete safety guarantee; The market price here in Huai 'an should be: 180-260 yuan/square meter.
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