When it comes to the overall market, the quality of construction projects has generally improved. However, during the inspection and acceptance of residential buildings, there are still many quality issues in door and window projects, which directly impact their functionality and performance. The reputation of the construction unit also plays a significant role in determining the quality of residential projects. Experts have shared some insights on the quality of door and window works and preventive measures:
First, Wooden Door and Window Projects
Wooden doors and windows are widely used in construction due to the availability of materials. To ensure quality and durability, it's essential to carefully select the type of wood, its grade, and moisture content according to construction specifications. If necessary, raw materials should be dried in a drying room. Anti-corrosion, pest control, and fireproof treatments should also be applied as per design requirements and standards. The frame and the groove of the door or window should fit tightly, with cement and rubber wedges used for secure fixing. The surface should be smooth, free from defects, with straight lines, accurate cuts, and tight seams. After finishing, the doors and windows should be immediately coated with dry oil to prevent moisture-related deformation.
Common Quality Issues
1. The vertical deviation of the frame is too large, leading to warping and poor diagonal alignment. The joints are not tight, the cement isn't properly applied, and there are visible planing marks and burrs on the frame. The grooves may not be aligned properly.
2. The hinge positions are inaccurate. The grooves vary in size and depth, and the edges are not neat. Wood screws are often over-driven, causing them to be too short.
3. Seams between the door and window frames are too wide, making the opening difficult to close. Some doors may not shut properly, experience rebound, or become unstable when opened or closed. The wind hook dimensions may not meet the required specifications.
4. The window frame is not raised properly, with the lower frame buried in the window sill’s plaster layer. This affects aesthetics and can cause cracks after mortar shrinkage, leading to water leakage.
5. Poor maintenance leads to uneven finishes, especially on the lower frame of the window, with no proper corners or edges.
Preventive Measures
1. Strict quality inspections and evaluations must be conducted according to construction and testing standards. Only qualified materials should be used, and all work should follow the same batch and process. Avoid cutting corners or using inconsistent batches.
2. Hinge installation should be done based on the model. Ensure that the groove sizes and depths are consistent. Hinges should be placed at the top of the door or window, at a height of 1/10 from the bottom or at the length of a double hinge. Both ends of the hinge device must be square and clean, and wood screws should be driven halfway before being fully screwed in.
3. The door and window hardware should operate smoothly, remain stable, and avoid rebound or misalignment. Ensure accurate hinge placement, with both hinges aligned and not bent. Screws should be straight and not twisted, and gaps should be left along the edges to allow for proper sealing. Do not adjust seam widths by smashing the head. The angle of the fan after the hook should be about 23 cm from the side wall.
4. The lower frame of the window should be raised above the window sill. After applying cement mortar, the top of the slope and the lower frame should be at least 8mm high. The corner should be slightly recessed to ensure proper drainage and prevent water from seeping inward. The side frame and upper and lower frames should be tightly packed.
5. Proper maintenance is crucial. Avoid touching or damaging the door and window frames. If no protective measures are taken, do not place scaffolding on the window frame.
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