Large span is not the cause of water ripple and crack. The ceiling needs a smooth keel, and the fixing of the suspender must be firmly in place. The center distance between keel and keel should be kept at 30 cm (some are 40 cm, but less, with poor stability); Gypsum board and gypsum board, there must be a gap of 3~5 mm; The binder component in the used caulking putty is essential and cannot be caulked at one time. Joint putty must enter the gap; After the first filling, you must wait until it is dry (at least 24 hours) before filling for the second time; The glue used for sticking bandages should be good quality white latex, and putty leveling construction can only be carried out after it is confirmed to be dry.

In a word, most of the problems are caused by improper construction. Strictly following the construction sequence and specifications is the key to reduce the occurrence of problems.