When constructing the roof in Meiyu season, the moisture in the light concrete slope making layer of the roof structure is difficult to be discharged, so the exhaust channel and exhaust hole shall be arranged on the base layer, so that the accumulated moisture in the roof can be discharged in time, so as to avoid the formation of water vapor to squeeze the surrounding structure of the roof when the temperature rises, and at the same time, the possibility of damaging the thermal insulation and waterproof structure of the roof.<br>
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