In the concrete waterproof layer, two-way Ф5@200×200 cold-drawing reinforcing steel mesh should be equipped and disconnected at the grid seam to enhance the rigidity of the waterproof layer and the integrity of the plate, and the arrangement of the reinforcing mesh in the waterproof layer. Should be in the upper part as much as possible, because the surface of the waterproof layer is affected by the temperature difference and easy to produce cracks, while considering the impact of surface carbon on the steel, therefore, the thickness of the protective layer of steel mesh shall not be less than 10mm.
The strength grade of the fine stone sarcophagus waterproof layer should not be less than C25, and mechanical stirring should be used. The mechanical turbulence, the water cement ratio of the rammer should not exceed 0 î€ 55, and the cement label should not be lower than 425#.
The thickness of the crucible shall not be less than 40mm. If it is too thin, the water loss of the crucible will be very rapid and the cement will not be fully hydrated, thereby reducing the impermeability of the crucible. The surface treatment of the waterproof layer should be emphasized. The panel should be consistent in thickness and thickness, and the drainage slope should meet the specification requirements. After the water is collected, secondary pressure is applied to cut off and seal the capillary in the crucible and improve the impermeability. When pressing the surface layer, it is strictly prohibited to sprinkle water on the surface, add cement slurry or spread cement to prevent cracking and peeling to reduce the waterproof effect.
Waterproof enamel pouring for 12 hours to 24 hours can be cured, covering a time of not less than 14 hours. In the initial stage of maintenance, it is not allowed to go to the people. The maintenance of the urn is an extremely important last step of the waterproof layer of fine stone sarcophagus. Poor conservation will cause early dehydration, not only reducing the strength of the crucible, but also due to shrinkage caused by internal cracks on the surface of the sand, so that the impermeability significantly reduced.
2, node and detailing practices
Improve node practices and enhance product protection. Due to the unreasonable construction of the nodes or the rough construction, it is often the main reason leading to the leakage of the nodes. A rigid and flexible approach should be adopted at the node part, and each node should be sealed with a sealing material, which is particularly important for a rigid waterproof layer.
The junction between the rigid waterproof layer and the gutter and sulcus should be grooved and sealed with sealant.
The gap between the rigid waterproof layer and the wall on the two sides of the deformation joint shall be 30mm. The joint shall be filled with the sealing material. The overflowing area shall be supplemented with a coiled material or waterproof membrane. The junction between the pipeline and the waterproof layer extending out from the roof shall be Leaving a gap, use slope protection first, and then fill and seal with sealing material.
The following requirements should be complied with at the outlet of the falling water pipe: (1) The additional layer added to the water when the water is laid is to be taken into account when burying the water at the elevation, and the thickness and drainage slope of the flexible sealing layer shall be increased; (2) The circumference of the water pipe Diameter 500mm, slope within range not less than 5%, and the application of waterproof coating or seal coating, the thickness of not less than 2mm, water fall cup and base contact should be left 20mm wide, deep 20mm groove, embedded sealing material.
The gap between the rigid waterproof and gable and parapet walls should be 30mm, and it should be filled with sealing material.
The main reasons for the cracking of the parapet wall are related to temperature changes, construction quality and environmental impact, and design and construction. Due to the cracking of the parapet wall, the plugging of the roof panel is not tight, which may lead to leakage of the interior corner and affect other parts. Therefore, in the horizontal surroundings of the parapet wall, one outer wall tile is attached to the outer vertical façade, and then the slope is prevented inwards to prevent the parapet from appearing on the long side of the parapet.
Six, ventilation and insulation practices
The common practice is to use 100# cement standard brick bricks to build a brick pier with a height of 180mm, and depending on the depth of the roof, it is also desirable to use 240mm. When the depth of the aerial roof is greater than 15 meters, a ventilation bridge shall be installed at the ridge, and a 30mm thick insulation board with a thickness of 600mm*600mm shall be covered on the brick pier, and then a layer of 20mm1:2 cement mortar shall be applied on the insulation board. The glazing smooth light surface layer was obtained by cutting the grid slits with a 400 mm×400 mm gauge with a cutting machine, and then filling the ointment in the grid slits with 300 mm two cloths and three oils on the surface.
In summary, it is not difficult to see that the quality of the waterproof roof is closely related to the design and construction. Due to the lack of attention to design or construction in accordance with the requirements of the construction, it will leave a lot of quality hidden dangers to the roof waterproofing project, which can not be made up. Therefore, to improve the quality of waterproof roofs, it is inevitable to double check the design and construction.
Waterproofing in roofing is a common problem in quality in construction projects. It is also a difficult problem that has not been solved for many years. At present, more rigid and flexible waterproof are used. Rigid waterproof due to temperature difference strain, easy to crack seepage; flexible waterproof, mostly asphalt, linoleum and other organic materials, easy to aging, short life. In recent years, although various new types of waterproof materials have come out one after another, due to high prices, lack of construction experience, and durability still needs further inspection and other reasons. Therefore, the use of cheaper materials is currently the mainstay.
Villa design cement coating layout
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