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在屋面现浇水泥膨胀珍珠岩保温层施工中,根据规范规定,宜在找平层上留槽作排汽道,排汽道应纵横贯通,不得堵塞,并应与连通大气的排汽孔相通,排汽孔必须做好防水。在实际施工中,通常采用在保温层中预埋钻孔PVC管的方法,面层预留排汽孔,而且要做到排汽道纵横贯通。但交叉节点很难处理,PVC管钻孔工作设计中一般无具体规定,实际效果并不十分理想。面层上部防水层因设排汽孔而增加施工难
In the construction of the in-situ-cast concrete expanded perlite insulation layer, according to the specification, it is advisable to leave troughs on the screeding layer as exhaust steam passages. The exhaust steam passages shall be vertically and horizontally connected and shall not be blocked, and shall communicate with the vent holes communicating with the atmosphere. The vent hole must be waterproof. In the actual construction, the method of pre-embedding PVC pipe in the insulation layer is usually adopted. The exhaust hole is reserved on the surface layer, and the exhaust steam path is to be penetrated horizontally and vertically. However, the cross-nodes are difficult to handle, and there are no specific regulations in the design of PVC pipe drilling. The actual results are not very satisfactory. The upper surface waterproof layer is difficult to build due to the vent hole