Waterproof, moisture-proof industry knowledge explanation II

Waterproof construction points outside the window wall:
The waterproof works of the outer window parts shall be constructed by the waterproof professional team.
1) Remove old glue. Remove glue from the outside window where water leaks.
2) Check the seam of window frame. See whether the shape and size of the joint meet the requirements of sealing design, the joint defects and cracks to be sealed are processed first.
3) Joint surface treatment. Wash the joint between the window frame and the wall with clean water to achieve no dust, no sand, no pollution and debris.
4) Caulking construction. During the construction of refueling tank, attention should be paid to shake the new tank well for 1 min, then unscrew the empty tank, and replace the new tank as soon as possible to prevent solidification and blockage of the nozzle connection.
5) Insert sealant. After 60 minutes of foam caulk filling construction, use a knife to cut, leave a 6mm deep slot around the frame, and then use sealant to fill and seal. When filling sealant, the operation should be smooth, and the nozzle should always be aligned with the bottom of the joint, with an Angle of 45°. When moving, the extruded sealant should always be in front of the nozzle; There is extrusion pressure in the seam, do not drag the glue gun. Avoid leakage or holes; The rubber strip should be straight, smooth and beautiful.
6) Plastic surgery. The scraping strip is compacting with the joint surface, and the modified joint makes the sealant fully contact and penetrate the structural surface, eliminate bubbles and holes, remove excess sealant, and form a smooth and streamlined sealing joint.
7) Open a drain hole. Aluminum alloy window frame sill should be set up drainage holes, the location and number of the sill should ensure that the drainage is unobstructed in rainy days.

Reason analysis

1. Brick level is low, brick joint mortar is not full enough, or for empty joint. Between the girth wall of the frame structure and the bottom of the frame beam, due to the settlement of masonry cracks and water leakage.

2. Scaffolding holes were not blocked properly as required, leaving water seepage channels.

3. External wall decorative surface layer empty drum, cracks, after rain, rain from the gap into the plaster layer and infiltration of the inner wall.

Treatment methods

1. When the external wall of high-rise building has local water seepage, the inner paint can be eradicated, the brick joint of water seepage can be found, the brick joint is not dense part of the mortar is removed, washed clean, and the cement mortar is embedded with 1:2.5.

2. A large area of water seepage, but no obvious cracks on the exterior decorative surface, the exterior wall decorative surface brush wash clean, after drying, with cationic chloroprene polymer emulsion A component and B component according to 1:1 mixing evenly, according to 0.4 water-cement ratio to join the grade of 42.5 ordinary Portland cement, and the cement slurry mixing evenly. The brick joints were marked with polymer cement slurry.

3. When the water leaks along the bottom of the frame beam, the decorative layer at the crack of the exterior wall should be removed, the mortar in the crack of the top surface of the brick wall should be scraped, washed, and the iron wedge should be tightened, and then the 1:2.5 cement mortar should be filled tightly and concave into the wall 10mm, and the flexible waterproof sealant should be filled in, and then the exterior wall decorative surface should be made up.

Prevention and control measures

1. Construction management should be strengthened, operation quality of masonry should be strictly enforced, and the provisions of "Code for Construction and Acceptance of Masonry Engineering" should be implemented. No eye frame should be left on the external wall. The ash joints of brick masonry should be horizontal and vertical, with uniform thickness and thickness, and the mortar full rate should be greater than 80%.

2. The filling wall of the frame structure, according to the requirements of the code: "When the filling wall is built close to the bottom of the beam and the plate, there should be a certain gap. Before plastering, the side brick, vertical brick or block oblique building should be tightened. The inclination is about 60 degrees, and the masonry mortar should be full. This is the main measure to prevent the settlement of filling wall masonry mortar.

3. Technical disclosure must be made before external wall construction. In the process of paving and paste must have extrusion process, and in the joint before a comprehensive inspection of the empty drum situation, joint to ensure the density, after the joint should pay attention to moist maintenance, the joint shall not be missed, joint depth is recommended to be strictly controlled, concave degree should not be too large, it is best to hook into a circular arc flat joint. Quality management to establish multi-level review control system to ensure the quality of each process.