On the construction of the ceiling without the floated coat and the flooring without the leveling blanket;

Combined with one office building work the reasons caused the roof leakage are analyzed and based upon introduction of the construction method of screed coat, insulation course and moisture barrier the roof replacement method is proposed as well as the points for attention in construction in order to completely solve the leakage issues of roof.

This paper analyzes on the common quality faults of cement mortar screed-coat in the roofing construction such as the inaccuracy of the slope-making,the unsmoothness of the drainage,and the sanding,peeling and cracking of the screed-coat,etc.

It introduces characteristic、application range、process principle,its construction points are discussed from base treatment、construction of leveling blanket、decking layer、face-milling and acid-washing,and proves its effect is good.