China Aluminum Industry Network: 1. Poor design or material selection in aluminum doors and windows. a) Incomplete design documentation or lack of structural analysis can lead to insufficient locking points, reduced structural strength, and excessive deflection under wind pressure. This may cause plastic deformation, cracking, or damage, ultimately leading to water leakage. b) Insufficient attention is often given to waterproofing on the windward and rain-facing surfaces. Overemphasis on natural lighting and ventilation results in the frequent installation of large glazed areas like bay windows, floor-to-ceiling windows, or through-windows, without proper consideration for building waterproofing, which increases the risk of water infiltration. c) Using mismatched profiles or improperly sized components can result in direct leakage due to gaps or inadequate sealing. d) Excessive focus on aesthetic design on the exterior can create multiple joints and corners, leading to sealing issues and potential water entry.
2. Quality issues during the manufacturing process of aluminum doors and windows. a) Inaccurate machining can result in non-standard milling gaps and excessive assembly clearance. b) Even when waterproof gaskets are used, they might be too small or not properly sealed with sealant. c) Short stripping of strips or tops can leave the ends exposed, allowing water to penetrate directly. d) Uncovered nail holes or extrusion holes can become points of water entry. e) Insufficient or improperly placed drainage holes may prevent quick water runoff from the windward side, causing water accumulation and leakage.
3. Improper sealing between aluminum doors, windows, and the building wall. a) Gaps that are too wide or too narrow make it difficult to install and fix the doors and windows, increasing the likelihood of cracks. b) Inadequate filling of the gap between the frame and the wall can result in hollow drums or cracks. c) Using substandard materials such as improper cement mortar or incorrect mix ratios can compromise the integrity of the structure. d) After installation, poor sealing between the door and the wall, or insufficient waterproofing, can allow water to seep in. e) Leaving adjustment pads inside the frame or failing to perform secondary filling after removal can also cause leakage. f) Lack of height difference between indoor and outdoor window sills, or improper positioning of the doors and windows relative to the outer wall, can lead to water ingress. g) For corner or interconnected windows, failure to seal the top of connecting rods can result in water dripping from the top to the bottom. h) Weak connections between doors, windows, and the opening can cause movement under wind load, resulting in cracks in the sealing material.
4. Poor quality of auxiliary materials used in sealing. For example, using hard plastic tape with short service life, expired or counterfeit sealants, or not using silicone-based weatherproof sealants can lead to aging, cracking, and poor sealing performance. Additionally, short bristles on the top brush or large gaps can allow water to enter directly. The use of substandard iron parts or sections that do not meet requirements can also lead to loosening and cracking under normal wind pressure.
5. Structural defects in the building itself. a) If the mortar mix ratio for the window sill is not up to standard or no waterproofing agent is added, water leakage is likely. b) Hollow tiles on the exterior walls or fine cracks in tile joints can allow rainwater to seep into the room under wind pressure. c) Cracks at the阴阳 (yin-yang) corners of the window sill can cause direct water penetration. d) Special-shaped windows like bay windows or floor-standing windows may not meet waterproofing standards if the supporting board is not properly installed. e) Lightweight or brick walls can develop fine cracks or gaps around doors and windows, leading to water seepage due to construction quality issues.
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