1．结构层要求刚度大、整体性好、变形小，且表面清洁干净。结构层采用装配式钢筋混凝土板时，板端、侧缝应用细石混凝土灌缝，
其强度等级不低于C20；板缝宽度大于40mm或上窄下宽时，板缝内应设置构造钢筋；板端缝应进行密封处理。
1. Structural layer requires stiffness, good integrity, small deformation, and the surface clean. When the structure layer using prefabricated reinforced concrete slab, plate side, side seam application fine stone concrete pouring, the intensity level is not less than C20; when the slab width greater than 40mm or the narrow width, should be set within the structural steel slab; board end joints should be sealed.

2．找平层的厚度和技术要求见表，且表面平整干净，表面平整度的允许偏差为5mm。
2. Leveling layer thickness and the technical requirements of Table, and the surface smooth and clean surface flatness tolerance of 5mm.

在基层与突出屋面结构(女儿墙、山墙、天窗壁、变形缝、烟囱等)的交接处和基层的转角处，找平层应做成圆弧形，其圆弧半径：沥青防水卷材为 100～150ram，高聚物改性沥青防水卷材为50mm，合成高分子防水卷材为20mm内部排水的水落口周围，找平层应做成略低的凹坑。
In the corner of the grass-roots and prominent roof structure (parapet, gable, roof wall, Deformation, chimneys, etc.) of the junction and the grassroots, leveling layer should be made of the arc-shaped, and its radius: asphalt waterproofing membrane for 100 ~ 150ram, polymer modified bitumen membrane for 50mm, synthetic polymer waterproofing membrane is around 20mm internal drainage fall-mouth, leveling layer should be made of slightly lower pits.

找平层应设分格缝，并嵌填密封材料。分格缝应设在板端缝处，其纵横缝的最大间距：水泥砂浆或细石混凝土找平层不宜大于6m，沥青砂浆找平层不宜大于4m。分格缝宽度应为20mm；当兼作排汽屋面的排汽道时，可适当加宽，并应与保温层连通。
Leveling layer should be located dividing joint and filling them with sealant. Dividing joint board should be located at the end joints, the maximum distance between its vertical and horizontal seams: cement mortar or fine aggregate concrete leveling layer of not more than 6m, asphalt mortar layer not more than 4m. Dividing joint width should be 20mm; doubles exhaust when the roof exhaust tract, may be appropriate to widen and should communicate with the insulation layer.

3．平屋面坡度，采用结构找坡时不应小于3％，采用材料找坡时宜为2％；天沟、檐沟纵向找坡不应小于1％，沟底水落差不得超过200mm 。
3. Flat roof slope, using the time to find the structure of the slope of not less than 3%, the use of the material should find the slope of 2%; gutter, gutter longitudinal slope shall not be less than 1% to find, ditch water drop must not exceed 200mm.