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Doors and windows should be impervious to water! Material selection and design are key to profile, glass and sealant!

Date:2017-11-27




The temperature is rising and the summer is coming. Are your worries coming again?

Yes, it's the water seepage from doors and windows that comes with the rainy season. Water seepage in doors and windows is a hidden danger, which will seriously affect the service life of buildings. There are many reasons for water seepage in doors and windows, which involve design, material use, installation and management.

Seepage reason

The following Xiaobian will come to you and analyze the doors and windows seepage causes are what?

01, aluminum profiles

Aluminum surface treatment does not meet the national standard, the surface coating adhesion is not strong, the oxide film is too thin or too thick, leading to sealant bonding failure.

The main stress components of aluminum columns and beams of insufficient strength, stiffness is not enough, the stress of the section part of the wall thickness is less than 3mm, the standard value of load under the action of the deflection is larger than L/180 or greater than the absolute deflection 20mm, curtain wall serious deformation, displacement and water leakage occurs.

There is no high quality high precision aluminum materials, especially the curtain wall should be used in ultra high precision grade. The aluminum profile is not qualified, its bending, twist, waviness and other serious exceeded, resulting in the overall flatness of doors and windows, perpendicularity can not meet the requirements.


02, sealant

The cost savings, using ordinary sealant without the use of outdoor climate resistant silicone sealant caulking, by solar ultraviolet irradiation, glue premature aging, resulting in cracking.

Using expired structural silicone sealant, weather resistant silicone sealant and wall adhesive, foaming, cracking or non solidification of glue joints, leading to seepage of doors and windows.

(3) the compatibility experiment of structural silicone sealant has not been carried out according to the specifications. The results show that the structural silicone sealant is incompatible with aluminum profile, glass, rubber strip and other materials, which affects the chemical changes of adhesion and affects the sealing effect.

03, glass

The glass strength is not checked, the glass does not have enough carrying capacity, it is cracked and broken under typhoon rainstorm, which leads to water inflow.

The glass is not checked by thermal stress, the large area of glass absorbs sunlight, the thermal stress exceeds its allowable stress, causing thermal fracture, and the doors and windows are leaking.

The glass size tolerance exceeds the standard, the amount and voids of the two sides of the glass do not meet the requirements. When the glass curtain wall is installed on the open frame glass, the glass is small, the depth of the groove is not enough, the width of the glue gap can not meet the requirements, and the glass is easy to break from the edge. The glass is too large, it is embedded into a rabbet position too deep, the glass is easy to thermal expansion of aluminum extrusion leads to water seepage.

The glass has no edge chamfering chamfering processing, using glass easy to produce stress concentration lead to dark crack or explode, the existence of hidden dangers.


04, construction

When the aluminum frame is installed, the quality of the curtain wall is directly affected by the quality, levelness, perpendicularity, diagonal difference and straightness exceeding the standard operation.

The construction of weather resistant silicone sealant is not dense, the sealing is not strict or the length or width ratio does not conform to the specification.

Neglect the construction condition of sealant. More rain in the south, such as in the rainy season forced open-air construction weather sealant, can not guarantee the sealing quality. Structural adhesive construction also has certain temperature and humidity conditions, must pay attention to.

Fourth, the sealing strip size does not conform to or uses inferior material, soon loosens or the aging, loses the seal waterproof function.

No direct contact between the glass and the component has been adopted. When the building deformation or temperature changes, the components of the glass produced greater stress, often from the bottom of the door and window began to crack the glass.

05, the use of

Not providing detailed completion information and instructions to users, users do not understand the correct use of the method, causing damage to the doors and windows, collision, deformation, pollution, etc., leading to seepage.

When door and window are clean, improper operation will damage doors and windows.

3. The residents were not allowed to carry out the reconstruction, and the damaged parts were not seriously packed and waterproof.

Finding problems and solving problems is the key. Since we know the reason, then how to prevent water seepage doors and windows?


preventive measure

There are three basic conditions leading to water seepage and water leakage in the doors and windows: there are pores; there is water; there is a pressure difference between cracks and water seepage. The elimination of one or more of these basic conditions is the way to prevent water leakage: one is to minimize the porosity; two is to block the rain, so as not to soak the gap; three is to reduce the pressure difference at the soaked crevice.

(1) the small holes on the door and window aluminum profiles are opened and the water collected through the small gap into the doors and windows is collected and discharged. Meanwhile, a small amount of water is accumulated in the equal pressure chamber between the glass and aluminum profiles and the aluminum buckles.

Selection of high quality structural silicone sealant, weather resistant silicone sealant, wall adhesive, and to strengthen the inspection, to prevent expired use. High quality float glass is adopted, and the glass must be processed by edge. The glass size error meets the standard requirements.

The attention control sealant used, rainy day weather prohibited Tianlu silicone sealant construction. Indoor temperature should not be higher than 27 degrees, relative humidity should not be less than 50%. Remove dust, grease, loose matter and other dirt on aluminum frame, glass or crevice before glue injection. After filling, it should be filled with dense, smooth surface and strengthened maintenance.

4. According to the standard requirements, the performance of anti rain leakage should be checked in order to repair and control the quality of doors and windows.

The quality inspection shall be divided into two categories: concealed acceptance and engineering acceptance. The concealed acceptance shall be carried out after the installation of the aluminum profile frame, and the acceptance of the project shall be carried out after the completion of the door and window project.

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