1．結構層要求剛度大、整體性好、變形小，且表面清潔干凈。結構層采用裝配式鋼筋混凝土板時，板端、側縫應用細石混凝土灌縫，
其強度等級不低于C20；板縫寬度大于40mm或上窄下寬時，板縫內應設置構造鋼筋；板端縫應進行密封處理。
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．找平層的厚度和技術要求見表，且表面平整干凈，表面平整度的允許偏差為5mm。
2. Leveling layer thickness and the technical requirements of Table, and the surface smooth and clean surface flatness tolerance of 5mm.

在基層與突出屋面結構(女兒墻、山墻、天窗壁、變形縫、煙囪等)的交接處和基層的轉角處，找平層應做成圓弧形，其圓弧半徑：瀝青防水卷材為 100～150ram，高聚物改性瀝青防水卷材為50mm，合成高分子防水卷材為20mm內部排水的水落口周圍，找平層應做成略低的凹坑。
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.

找平層應設分格縫，并嵌填密封材料。分格縫應設在板端縫處，其縱橫縫的最大間距：水泥砂漿或細石混凝土找平層不宜大于6m，瀝青砂漿找平層不宜大于4m。分格縫寬度應為20mm；當兼作排汽屋面的排汽道時，可適當加寬，并應與保溫層連通。
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，采用結構找坡時不應小于3％，采用材料找坡時宜為2％；天溝、檐溝縱向找坡不應小于1％，溝底水落差不得超過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.