Causes of rainwater leakage in aluminum doors and windows

[China Aluminum Network] The main reason for the leakage of aluminum doors and windows rain can be divided into four major categories.

One: In the design process, there are defects in the structure of the doors and windows themselves. Second, the quality of the doors and windows cannot be satisfied during the process. Third, the materials and accessories are caused by the disagreement of the grid. Fourth, the sealing of the joint parts of the wall of the hole is caused by improper sealing.

Leakage caused by one or four of these four categories is more harmful and difficult to handle. . In addition, there are defects in the building structure itself, which causes the phenomenon of rain leakage at the joints between the doors and windows and the wall of the cavern. However, this is not a leakage problem for doors and windows.

A. The design of the waterproof structure of aluminum doors and windows is unfair, the level of waterproof seal is not enough, and the drainage channels in the aluminum doors and windows structure cavity are not formed. When the rainwater enters the aluminum door and window cavity and enters the room easily due to the difference of the indoor and outdoor wind pressure, the rainwater entering the aluminum door and window cavity can not be smoothly exhausted through the aluminum door and window drainage system and remain in the door and window. Water leaks.

B. The structural strength and rigidity of the aluminum doors and windows fail to meet the requirements of the wind pressure performance of the location of the aluminum doors and windows, resulting in the aluminum rods, windows, the stress rods, hardware fittings, seals and bonding materials under normal wind loads. Severe plastic deformation, cracking or damage, etc., resulting in failure of the door and window body seals and rain leakage. The reason is that the product fails to accurately calculate and design the strength according to the specifications, and it does not pass the physical performance test of wind pressure before the production installation.

C. In the process of architectural design, improper selection of aluminum alloy doors and windows is also one of the causes of rainwater leakage from doors and windows. It is common to use ordinary sliding door aluminum doors and windows for the facades of high-rise buildings or areas where there is a large amount of rain, and it is not used directly in the structure of aluminum doors and windows or in the structure of the building to take necessary waterproof measures.

D, aluminum doors and windows installed in the field, the assembly size control is not good, resulting in mutual lap seal the position of the misaligned or overlap size is insufficient, or due to pressure enough and there is a gap, used to secure the door window frame fastening Screw does not close Sealed by glue, and the surface of sealing part is not cleaned when sealed with sealant.

E, aluminum doors and windows used in the sealing material is too bad, such as the rubber is too hard, anti-aging time is short, the sealant is out of date use or counterfeit fake rubber, anti-shift ability is poor, easy to crack and so on.

F, aluminum doors and windows processing accuracy can not meet the quality requirements, with the gap is too large, the need to assemble after the adhesive assembly without direct sealing material assembly, causing rain through the various assembly gaps penetrate the doors and windows and the main structure.

G. The joints between the aluminum doors and windows and the wall of the cavern are the parts where the rainwater leakage is more common. The main reasons are as follows:

1. Because the building wall adjacent to the entrance of the door and window has its own defects, rain is directly penetrated through the wall under the action of wind load. Especially when the exterior wall is a tile, the phenomenon is more common, because the gap between the tiles is often fine. Cracks exist. This phenomenon is often mistaken for leaking doors and windows because the water seepage site is close to doors and windows.

2. The filling material is not filled with the gap between the door and window frame and the wall, forming a hollow valley phenomenon or cracks.

3. The adjustment pad of the fixed door and window frame remains in the door window frame, or no secondary filling is performed after the removal.

4. The gap between the aluminum doors and windows and the wall of the cavern fails to fill qualified materials as required. For example, the marks of the waterproof cement mortar are inconsistent or have different scores.

5, wall hole hole size does not meet the design requirements, resulting in the gap between the shape of the door and window and the wall more than the designated range, too small gap caused by unable to fill the material, the gap is too large to make the doors and windows difficult to fix and filling is not easy Cracks, etc.

6. The fixed connection between the door, window and the hole is not secure, so that the door and window are moved under the action of the wind load to cause cracks in the sealing material.

7. After the doors and windows are installed, there is no seal between the outside of the doors and windows and the wall, or the seal fails.

8. For doors and windows with corners or interconnected forms, the upper part of the connecting rods at the corners or connecting parts are not plugged, and it is easy to cause leakage of rain water from top to bottom into the room.

Tapping Screw

Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.