The doors and windows are leaking again, what's the problem? | window and door sealant

16 / 08 / 2021

The doors and windows are leaking again, what's the problem? | window and door sealant
Guangzhou Jointas Chemical Co., Ltd. is a national high-tech enterprise focusing on R&D, production and sales of environmentally friendly sealants and coatings, and is committed to providing customized solutions to customers around the world.The products are Window And Door Sealant,Welcome customers to consult!

I believe that many people have faced the problem of water seepage in door and window openings. Although doors, windows and glass are not leaking, the gaps between doors, windows, openings, and walls will always cause leakage accidents due to improper construction, which makes many people a headache.
The reasons for water seepage in doors and windows are very complex, involving design, material use, installation and management. In summary, there are several points:
1. The doors and windows are not installed properly;
2. Loose doors and windows;
3. The waterproof layer of doors and windows is damaged;
4. The drainage holes of doors and windows are blocked.
Wen would like to explain and analyze the use of sealant for door and window installation.
Door and window sealants include window sash sealants, internal and external wall sealants. Although sealants account for only a very small part of the door and window system (only 3.5% of the overall cost of doors and windows), the survey shows that the rate of complaints from owners due to air and water leakage of doors and windows But it is as high as 67%.
This is because sealant can prevent internal and external media (rain, sand, air, etc.) from leaking or intruding into doors and windows. It is an important barrier for doors and windows to have air tightness and water tightness. Its quality is related to the effect of doors and windows.
For doors and windows that are already in use, you can check whether the sealant is invalid from the following two points:
1. Visual inspection
Check whether the surface of the door and window sealant is uniform, whether there is obvious discoloration, cracking, and chalking.
2. Adhesion inspection
Check whether there is cracking and curling on the edge of the sealant, especially the bonding part of the outer sealant and the wall.
If the appearance and bonding effect of the sealant have changed, it is recommended to replace the sealant to ensure the effect of use.

Precautions for replacing door and window sealant
1. Choose brand sealant with quality assurance
There are a large number of low-quality sealant products in the decoration market. Although the price is cheap, the service life is extremely short. Some may harden and crack in one or two years or even months.
2. Select sealant with displacement capacity of 20 and above
In the actual use process, the sealant will be stretched and compressed with the deformation of the joint. If the displacement ability level is too small, the gel may crack.
3. Confirm that the adhesion between the sealant and the substrate is qualified before construction
Sealant is not a universal glue, not all materials can be bonded, and a small number of sprayed materials may have poor bonding, and will debond after using for a period of time. In addition, the base surface of the external wall gap wall should be smooth and compact, and no sand or ash should fall.
If the sealant comes into contact with other materials, such as paint, EPDM strips, cushions, etc., compatibility tests should also be conducted.
4. Clean the surface of the substrate before construction
The surface of the substrate should be cleaned up during construction to ensure that the bonding surface is dry and clean. It is not advisable to apply glue immediately after heavy rain, because the moisture content in the wall is high, which will escape when the temperature rises, causing the sealant to bubble.
It is worth noting that local non-stickiness is a cleaning and construction problem. If it is a large area that is not sticky, you should consider the adhesion of the sealant to the substrate.
5. Sealant filling situation
The gap should be fully filled during construction. It is recommended that the overlap width of the sealant on both sides is not less than 5mm and the thickness is not less than 3mm. Reasonable wide thickness can ensure the long-term use of the sealant.
6. Check the use of foaming agent
If the foaming agent filled in the gaps of the window frames has aged and powdered, it should also be replaced, and the original foaming agent should be cleaned up and then filled with the foaming agent again.