Construction Requirements for Cement Mortar Plaster for Roof Engineering

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Construction Requirements for Cement Mortar Plaster for Roof Engineering
1. Base course cleaning: clean up the loose sundries above the structural layer and thermal insulation layer, and remove the hard blocks protruding from the surface of the base course.
2, such as in the plate prefabricated insulation layer operation, should first plate bottom pad solid leveling, not easy to fill the vertical seam, corner damage, should be filled with the same kind of insulation plate broken powder filling.
3. Sprinkling and wetting: Before plastering the leveling layer, the liquor at the grass-roots level should be moistened, but it should not be watered thoroughly with water. It should be properly mastered so as to achieve a firm combination of the leveling layer and the thermal insulation layer.
4. Interface treatment should be done on the grass-roots level that is not easy to combine with leveling materials.
5, leveling layer to leave the grid seam, the width of the general grid seam should be 20mm; The position of the grid seam should be retained at the plate end, and the maximum spacing of its vertical and horizontal joints: cement mortar or fine stone concrete leveling layer should not be greater than 6mm; Asphalt mortar leveling layer should not be greater than 4mm, and sealing materials should be embedded in the partition joints.
6. The drainage slope of the leveling layer shall meet the design requirements. The slope finding of flat roof using materials should be 2%; The longitudinal slope finding of gutter and eaves ditch shall not be less than 1%, and the water drop at the bottom of the ditch shall not exceed 200mm.
7, insulation layer (base) and protruding roof structure (parapet, gable deformation joints, air vents, etc.) at the junction and the corner of the base, leveling layer should be made into a circular arc, arc radius should meet the requirements of the table below. The screed shall be made into a slightly lower pit around the water fall of the internal drainage.
8, gutter, corner, root and other places should be done before large area plastering, there are slope requirements of the parts, must meet the drainage requirements.
9, large area plastering in the middle of the two ribs mortar, spread with a trowel, and then use a scraping bar according to the elevation of the two sides of the reinforcement scraping level, and then use a wooden trowel leveling, and then use a wooden bar to check the flatness.
10. Iron trowel pressing for the second and third times: When cement mortar starts to set and people step on it with footprints but do not sink, iron trowel is used for the second time. Attention should be paid to prevent pressure leakage, and dead pits, dead corners and sand holes should be leveled and compacted. When the trowel cannot press the lines, leveling and compaction can be completed for the third time. This process should be carried out before the final setting of mortar. The consistency of mortar should be controlled at about 70mm.
11. Maintenance: After leveling and compaction of leveling layer, watering and curing shall be carried out after 24h at normal temperature. The curing time is generally not less than 7d, and waterproof layer construction can be carried out after drying.

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