Roof and exterior wall seepage is a common quality problem. How to prevent roof and exterior wall leakage, this article focuses on some technical issues in construction.
First, roof coating waterproof construction
1. The cement mortar screed must be lined or marked for slopes according to the design requirements and be installed with separate grid strips. After the cement mortar is leveled and closed, it should be calendered twice to make the surface flat and dense and fully maintained. The round corner of the roof requires a round trowel to wipe out the arc, and the screed layer within the 50-m diameter range around the water drop-off point should be concaved and concaved. pit.
2. Sub-grid seams can be completely disconnected, and the upper part can also be 1/2 sub-seam, the lower part is not broken, sub-grid seams filled with sealing material.
3. Before the construction of the waterproof layer, the dust, sand, gravel, debris, oil, and mortar must be removed from the foundation.
4. When there is a high and low span, the construction of the waterproof layer shall be constructed in accordance with the principle of first high and low, and in the same span, the principle of first and last distance should be followed, starting from the lowest point.
5. Before the construction of the waterproof layer of the coating film, the degree of dryness of the base layer must be tested. During the test, the lm2 waterproofing membrane or the plastic film shall be laid flat on the screeding layer. After being stood for 3-4 h, the inspection shall be opened and the covering portion of the screeding layer shall be opened. No watermark on waterproof membrane or plastic film can be applied.
6. Before the large-area coating construction, additional reinforcing treatment should be performed on the water fall-off, yin and yang angles, gutters, and eaves.
7. Synthetic polymer waterproof coating thickness should be greater than or equal to 2miD_, modified asphalt waterproof coating should be greater than or equal to 3mm, asphalt-based waterproof coating should be greater than or equal to 8mlTl. 8. Waterproof coating should be divided over the brush, coated When the brush is applied, it should be dried and filmed before it can be painted again. The direction of the brushing is perpendicular to the previous one.
9. When painting the waterproof layer on the corners and facades, it should be re-coated many times without flowing or accumulation.
10. The inside of the parapet wall and the top of the roof must be waterproofed according to design and specifications.
11. When using cement mortar, block or fine stone concrete as protective layer, the coating film should be completely dry, and after spreading the isolation layer, you can wipe cement mortar or cast fine stone concrete. Mortar or fine stone concrete should be calendered and divided according to requirements. Separation grid spacing should not be greater than 6m, seam width of 10mm, and sealed with sealing material embedded.
Second, the external wall waterproof construction 1. Exterior wall leveling layer should be mixed with water repellent, anti-cracking agent or water-reducing agent and other materials of cement mortar, mortar can not be used, leveling layer of cement mortar strength level should not be less than M7. 5. 2. The outer wall of different materials at the junction should be added in the leveling layer wide metal mesh.
3. When a smooth concrete wall or light wall is used to level the screed, a polymer cement mortar adhesive layer shall be provided.
4. The outer wall waterproof layer, when the wall is cast-in-place concrete or other surface with flat material, can be combined with the leveling layer, otherwise the waterproof layer must be set on the cement mortar leveling layer, and its compressive strength level is not Should be lower than M7.5. 5. The waterproof layer should be provided with grid slits, the vertical and horizontal spacing of the seam should not be greater than 3m, the width is 10mm, the depth is the thickness of the waterproof layer, and the sealing material is 5-8mm.
6. Exterior wall facing bricks should use polymer cement mortar or polymer cement slurry as cementing material, and check the seal tightly.
7. The reserved openings for doors and windows must be accurate. Each side should not be larger than 10mm on each side. Use polymer cement mortar to level the surface and apply no less than 50 rllril to the wall. Height difference between the inner and outer windowsill should be greater than or equal to 20no_in. Should be greater than or equal to 20% of the drainage slope; sliding window should be set limit device; aluminum alloy frame must have a drain hole.
8. When the outer wall leveling layer and waterproof layer are applied, the grassroots layer should be fully wetted and the layers should be pressed. After the completion of the construction, the watering and curing shall be carried out in time, and the curing time shall not be less than 3 days.
First, roof coating waterproof construction
1. The cement mortar screed must be lined or marked for slopes according to the design requirements and be installed with separate grid strips. After the cement mortar is leveled and closed, it should be calendered twice to make the surface flat and dense and fully maintained. The round corner of the roof requires a round trowel to wipe out the arc, and the screed layer within the 50-m diameter range around the water drop-off point should be concaved and concaved. pit.
2. Sub-grid seams can be completely disconnected, and the upper part can also be 1/2 sub-seam, the lower part is not broken, sub-grid seams filled with sealing material.
3. Before the construction of the waterproof layer, the dust, sand, gravel, debris, oil, and mortar must be removed from the foundation.
4. When there is a high and low span, the construction of the waterproof layer shall be constructed in accordance with the principle of first high and low, and in the same span, the principle of first and last distance should be followed, starting from the lowest point.
5. Before the construction of the waterproof layer of the coating film, the degree of dryness of the base layer must be tested. During the test, the lm2 waterproofing membrane or the plastic film shall be laid flat on the screeding layer. After being stood for 3-4 h, the inspection shall be opened and the covering portion of the screeding layer shall be opened. No watermark on waterproof membrane or plastic film can be applied.
6. Before the large-area coating construction, additional reinforcing treatment should be performed on the water fall-off, yin and yang angles, gutters, and eaves.
7. Synthetic polymer waterproof coating thickness should be greater than or equal to 2miD_, modified asphalt waterproof coating should be greater than or equal to 3mm, asphalt-based waterproof coating should be greater than or equal to 8mlTl. 8. Waterproof coating should be divided over the brush, coated When the brush is applied, it should be dried and filmed before it can be painted again. The direction of the brushing is perpendicular to the previous one.
9. When painting the waterproof layer on the corners and facades, it should be re-coated many times without flowing or accumulation.
10. The inside of the parapet wall and the top of the roof must be waterproofed according to design and specifications.
11. When using cement mortar, block or fine stone concrete as protective layer, the coating film should be completely dry, and after spreading the isolation layer, you can wipe cement mortar or cast fine stone concrete. Mortar or fine stone concrete should be calendered and divided according to requirements. Separation grid spacing should not be greater than 6m, seam width of 10mm, and sealed with sealing material embedded.
Second, the external wall waterproof construction 1. Exterior wall leveling layer should be mixed with water repellent, anti-cracking agent or water-reducing agent and other materials of cement mortar, mortar can not be used, leveling layer of cement mortar strength level should not be less than M7. 5. 2. The outer wall of different materials at the junction should be added in the leveling layer wide metal mesh.
3. When a smooth concrete wall or light wall is used to level the screed, a polymer cement mortar adhesive layer shall be provided.
4. The outer wall waterproof layer, when the wall is cast-in-place concrete or other surface with flat material, can be combined with the leveling layer, otherwise the waterproof layer must be set on the cement mortar leveling layer, and its compressive strength level is not Should be lower than M7.5. 5. The waterproof layer should be provided with grid slits, the vertical and horizontal spacing of the seam should not be greater than 3m, the width is 10mm, the depth is the thickness of the waterproof layer, and the sealing material is 5-8mm.
6. Exterior wall facing bricks should use polymer cement mortar or polymer cement slurry as cementing material, and check the seal tightly.
7. The reserved openings for doors and windows must be accurate. Each side should not be larger than 10mm on each side. Use polymer cement mortar to level the surface and apply no less than 50 rllril to the wall. Height difference between the inner and outer windowsill should be greater than or equal to 20no_in. Should be greater than or equal to 20% of the drainage slope; sliding window should be set limit device; aluminum alloy frame must have a drain hole.
8. When the outer wall leveling layer and waterproof layer are applied, the grassroots layer should be fully wetted and the layers should be pressed. After the completion of the construction, the watering and curing shall be carried out in time, and the curing time shall not be less than 3 days.