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How to effectively avoid the drumming of the aluminum curtain wall joint sealant?

Recently, due to the transition of seasons and accompanied by strong winds in certain regions, the sealant on the joints of aluminum curtain wall panels is prone to “bubbling”. As a technical engineer from HOMEY Technology, I will analyze the causes of this phenomenon based on practical cases and provide you with 5 steps to prevent it from happening.

Let’s differentiate between “blistering” and “bubbling”.

The phenomenon of deformation and protrusion on the surface of the sealant joint after a period of time may be “blistering” or “buckling”. The appearance of the two is very similar, but the root causes of these two phenomena are not the same, and the corresponding solutions are also different.

Generally appearAluminum curtain wallGlass curtain wall, aluminum curtain wall, stone curtain wall
PerformanceProtruding colloid cut inspection is solidProtrusion colloid cut check is hollow
Main formation mechanismThe joint displacement changes greatly during the curing process of the sealantThe foam rod was punctured by a sharp object when it was filled, and it rebounded after sizing, causing the colloid to protrude




What are the effective measures to prevent sealant from blistering?

In terms of design:

The joint width of a curtain wall should be calculated based on the JGJ 102-2003 Technical Specification for Glass Curtain Wall Engineering, and increasing the joint width appropriately can reduce the occurrence of blistering in practical engineering applications.

Choose high-quality silicone weatherproof sealant.

Choosing a high-quality product is the primary key factor in creating a premium project. To address the blistering issue in aluminum curtain walls, it is recommended to use a specialized sealant for aluminum curtain walls. This product has a fast curing speed, is less affected by external environments, and can quickly form a strong layer of adhesive in a relatively short time, reducing the occurrence of blistering.

Selecting the appropriate diameter foam backer rod and following the standard construction process for sealing.

The diameter of the foam backer rod should be 120% of the joint width. Multiple sizes of foam backer rods can be chosen to meet the requirements of different joint widths on site, and their length should be consistent with the joint length. Additionally, follow the standard construction process for sealing.

Pay attention to the temperature and external influences during construction.

Avoid the high temperature peak period and choose a suitable time for construction. Overcast days are the best time for rushing work. During seasonal changes, high daytime temperatures and humidity can easily cause blistering during morning sealant application and afternoon panel exposure, due to joint contraction. Therefore, construction should be carried out in the evening when the sun has set or with appropriate shading measures, such as dust-proof nets, to shield the scaffold and reduce panel temperature, thereby minimizing joint deformation caused by temperature differences.

Two rounds of sealant application.

When site conditions permit, two rounds of sealant application can be used. First, apply a concave sealant joint, allow it to cure for 2-3 days until it has elasticity, and then apply a layer of sealant on the surface. It should be noted that when applying the second layer of sealant, the surface of the first layer of sealant should be kept clean and free of dust and other debris, otherwise, the two layers of sealant will not form effective adhesion.

The problem of sealant swelling in the use of silicone weather-resistant sealant in aluminum curtain walls is closely related to factors such as joint design, on-site construction environment, process, and sealant selection. Especially during the seasonal transition period, construction should be carried out according to the standard construction process of HOMEY weather-resistant sealant, and aluminum curtain wall special sealant should be selected to reduce the phenomenon of swelling in aluminum curtain walls.

HOMEY966 silicone weatherproof sealant is specifically designed for weather-resistant sealing of various types of curtain walls, and can effectively prevent joint swelling and bubbling problems, including in aluminum curtain walls. It has excellent adhesion, elasticity, and elongation.

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