Roof waterproof construction scheme

In order to carry out the design intention of building waterproof engineering and ensure the quality of waterproof engineering, it is necessary to carry out standardized operation and achieve correct and meticulous construction. The following is my roof waterproof construction scheme for everyone. Welcome to read and browse.

Basic requirements of roof waterproof construction scheme for waterproof construction

Construction quality requirements

In order to carry out the design intention of building waterproof engineering and ensure the quality of waterproof engineering, it is necessary to carry out standardized operation and achieve correct and meticulous construction. Waterproof construction is the key to ensure the quality of waterproof engineering. Therefore, its important basic requirement is to strive for excellent construction quality.

The quality of waterproof construction involves whether the construction conditions are met, whether the preparatory work is mature, whether the management system is sound, whether the inspection is timely, the quality of relevant levels, the level of construction technology, the skill and responsible attitude of operators, and whether the protection of finished products is perfect. Only by carefully handling all links and aspects of the construction process and handling every working procedure of the construction can we ensure the excellent construction quality.

Requirements for construction conditions

Construction conditions are the necessary guarantee of construction quality, and the implementation, construction progress and construction quality of waterproof design depend on whether the conditions are sufficient and complete.

Climatic conditions of roof waterproof construction scheme

Weather: The weather during construction refers to weather conditions such as rain, snow, frost, dew, fog and atmospheric humidity. In rainy and snowy weather or when it is expected that there will be rainy and snowy weather during the waterproof layer construction, waterproof layer construction should not be carried out, so as to avoid rain and snow damaging the constructed waterproof layer and losing the waterproof effect. If it encounters rain and snow during the construction of waterproof layer, it must be protected immediately. If it is a coiled material waterproof layer, the periphery of the finished coiled material should be sealed with sealing material to prevent rain soaking. For waterproof coating or waterproof concrete construction, temporary covering should be taken before the coating dries and the concrete hardens to avoid rain. When frost, fog or atmospheric humidity is too high, it will increase the water content of the base. Waterproof materials, such as coiled materials and coatings, which require low moisture content at the grass-roots level cannot be constructed. Construction must be carried out after the frost and snow recede and the base is dry, otherwise it will cause poor bonding or bulging, and powdery hydrophobic materials are not limited by this.

Temperature: Due to the different performance and technology of waterproof materials, the requirements for temperature are slightly different, but the first course should be constructed at the temperature of 5 ~ 35℃. At this time, the engineering quality is easy to ensure and the construction is convenient for operators. Under limited conditions, hot-melt coils and solvent-based coatings can be constructed at temperatures above-10℃, because these materials have good low-temperature resistance and are not easy to freeze at negative temperatures. Cold-bonded polymer modified asphalt coil should not be constructed to synthesize polymer coil below negative temperature; Asphalt coiled material should not be constructed at 0℃; Asphalt-based coatings, polymer emulsion asphalt coatings, rigid waterproof layers, etc. should not be constructed below 5℃, and some materials are not easy to brush at low temperature, or are easily damaged by freezing during hardening. But when the temperature exceeds 35℃, all waterproof materials are not suitable for construction. When the weather is hot, construction can be carried out at night, but it should be noted that construction is not allowed when the dew is heavy in the second half of the night.

Strong wind: waterproof layer shall not be constructed in windy weather above level 5. Because windy weather is easy to blow dust and sand particles attached to the base, affecting the adhesion between the waterproof layer and the base; Coatings, adhesives and other materials themselves will also be blown away by the wind, affecting the uniformity of brushing; The coiled material is easy to crack when it is lifted by the wind, which affects the construction quality; Powdered hydrophobic materials are more easily blown away by the wind. In addition, transportation and operation are not safe.

In order to ensure the construction quality, the base should be cleaned after the strong wind, and the dust and sand on the base should be removed to ensure the construction quality of the waterproof layer.

Quality requirements of roof waterproof construction scheme for relevant grades of roof waterproof layer

structure sheaf

The quality of structural layer is extremely important, which requires high rigidity, good integrity and small deformation. It is best to use integral cast-in-place slab and waterproof concrete slab for structural layer, which is very beneficial to waterproof layer. If precast slabs are used in the structural layer, C20 fine stone concrete should be filled in the slab joints, and micro-expansive agent should also be added to the fine stone concrete. When the width of slab joint is greater than 30mm or narrower on the top and wider on the bottom, structural reinforcement must be set in slab joint. When using the coated waterproof layer, the sealing material is embedded in the groove at the top of the slab joint.

Leveling blanket

The waterproof layer is attached to the base, and the quality of the base will directly affect the quality of the waterproof layer, which is the basis to ensure the construction quality of the waterproof layer.

1, slope

Leveling layer is the foundation of waterproof layer. For most flexible materials, the drainage slope of leveling layer is extremely important and key. Roof and toilet must have accurate drainage slope, otherwise it will not only cause poor drainage, but also easily cause water accumulation, soak the waterproof layer, accelerate the aging of the waterproof layer and cause leakage. Before the construction of waterproof layer, it is necessary to check not only the drainage gradient of roof and ground according to the design requirements, but also the slope of gutter, impinges mouth, floor drain, cornice extending out of roof pipeline and free drainage.

2, flatness

The flatness of leveling layer has great influence on the construction quality of flexible waterproof layer. If the leveling layer is uneven, the adhesive can not be evenly applied when sticking the coil, and the coil will not be laid well, which will have a greater impact on the coating. Uneven leveling layer is easy to cause uneven thickness of waterproof layer and weaken waterproof ability. Therefore, before laying the waterproof layer, it must be checked with 2m feet, and the maximum gap shall not exceed 5mm, and the gap shall be allowed to change gradually, and it shall not exceed one place per meter. Smoothness includes the slope direction along the surface and the slope direction perpendicular to the roof, and special attention should be paid to the slope direction along the surface, because uneven direction is easy to cause water accumulation.

3. Strength and surface quality

The waterproof material constructed by full adhesion method requires the leveling layer to have a smooth surface, no sand and no peeling, and a certain strength. For rigid waterproof layer, waterproof layer made of powdery hydrophobic material, and coiled material with poor ductility but not requiring firm bonding, the surface requirements can be lower, so low-grade mortar can be used as leveling layer. The base of coating waterproof layer not only requires high strength and smooth surface, but also avoids cracks. Once the base is cracked, it is easy to pull the coating.

In order to avoid or reduce the cracking of the leveling layer, the roof leveling layer should be provided with frame joints, which should be located at the joint of plate end joints, roof turning points, waterproof layer and protruding roof structure, with the maximum vertical and horizontal spacing of 3 ~ 4m and the maximum spacing of 6m. The joint width should be 20mm, and sealing material or empty coil can be filled in the frame joint. The purpose is to concentrate the structural deformation, leveling layer shrinkage deformation and temperature difference deformation on the frame joints and give them flexible treatment.

4. Moisture content

Flexible waterproof layer requires higher moisture content at the grass-roots level and must meet the specified requirements. Excessive moisture content will cause the waterproof layer to bulge. But for the base with rigid waterproof layer, the waterproof layer with heavy objects and the waterproof layer with fine stone concrete, the water content is not limited, as long as there is no Mingshui.

5, clean

Before laying any waterproof layer, the leveling layer must be cleaned to remove bricks, stones, sundries, tools and mortar bumps, as well as sand and dust on the surrounding scaffolding and daughter's wall. Cleaning should be carried out at any time during construction, because when the construction period is long, the activities of construction personnel and windy conditions will bring dust to the leveling layer.

6. Repair

There may be some defects in the construction and maintenance of the leveling layer, such as local unevenness, sanding, peeling, cracks, unstable fixation of embedded parts, etc., and the defects should be repaired in time before laying the waterproof layer.

(1) is uneven. If the flatness of the leveling layer exceeds the specified value, the protruding part should be leveled or scraped off to make up for it. The concave part should be mended with 1: 2.5 cement mortar and 108 glue, and 15% of the cement weight. The thinner part can be scraped with a plain paste mixed with glue.

(2) Sand and peeling. For the waterproof layer that requires firm bonding between the waterproof layer and the base, it must be repaired, the peeling place should be removed, and a layer should be scraped with a flat paddle mixed with 15% 108 glue, and then smoothed and calendered.

(3) cracks. For fully bonded coiled materials, coated waterproof layers and powdery hydrophobic materials, it is required to repair the cracks in the leveling layer, especially the cracks with large cracks, which should be dealt with seriously.

When the crack width is less than 0.5mm, it can be leveled with sealing material, with a thickness of 2mm and a width of 30mm, and then a layer of isolation belt is laid on it, and then the waterproof layer is constructed; If the crack width exceeds 0.5mm, the leveling layer should be chiseled along the crack, and its upper mouth is 20mm wide and its depth is 15 ~ 20 mV. Joints should be cleaned, filled with sealing material, and then painted with 100mm width.

(4) The embedded parts are not fixed firmly. If it is found that the embedded parts of the impinges mouth, the pipes protruding from the roof and the installation equipment are not installed firmly, the fine stone concrete mixed with micro-expansive agent should be dug out immediately, and the contact between the upper part and the grass-roots level should be set aside for 20mm? 20 mm groove, embedded with sealing material, with slope around as required.

Acceptance of roof waterproof construction scheme

After the waterproof project is completed, it shall be verified by the quality supervision department and passed the inspection. The following archival materials shall be provided when the project is accepted:

1, waterproof engineering design drawings, design changes and engineering negotiation records.

2, waterproof engineering construction scheme and technical disclosure.

3, material factory quality inspection certificate and on-site second-round exam inspection report, waterproof material certificate of government departments, etc.

4, construction inspection records, water spraying or storage records, concealed engineering acceptance records, inspection reports, etc.

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