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What is called the empty drum? Empty drum what does it mean?

Zhejiang Lvhouse Co.,Ltd | Updated: Dec 13, 2016

Empty drum is a kind of common quality faults in housing projects, refers to surface decoration (plaster or tile) is not dealt with properly and the grass-roots level, combined with tight, cause gap space between base and surface decoration, taps with a hard object will hear a drum sound, project called "hollow".