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The rainy season is coming, and choosing the right sealant for door and window installation is key to preventing leaksThe rainy season is coming, and choosing the right sealant

With the arrival of spring, most parts of China are entering a rainy season. Even in the relatively dry northern regions, “sweating walls,” water seepage on the ground, foggy mirrors, and clothes that are difficult to dry can occur. This season is not only a critical time to test the waterproof quality of buildings, but also the best time to check the sealing and waterproof performance of doors and windows.

waterproof sealant

Doors and windows are designed to have different functions such as thermal insulation, heat insulation, sound insulation, waterproofing, and fire prevention. The new requirement for energy conservation demands that doors and windows should also be energy-efficient. In cold regions, about 25% of the heating energy can be lost through gaps in doors and windows, so the requirement for tight sealing is an important part of energy-saving design. Doors and windows also play an important role in sealing and waterproofing the outer layer of a building. If the sealing between the window frame and the wall or the separation component is not tight enough, it will seriously affect its thermal insulation, heat insulation, and waterproofing effects.

window silicone sealant

There are three main reasons why doors and windows may leak:

First, doors and windows must be square, otherwise they may become increasingly crooked over time, and the gap between the window frame and the wall will become larger and larger, leading to air and water leaks.

Secondly, during installation, foam sealant should be used to fill the gaps between the window frame and the wall. After the foam sealant is solidified, sealant or waterproof glue should be applied evenly around the window frame to prevent rainwater from seeping into the room from the installation gap between the window and the wall, and to prevent air leaks. However, some workers may cut corners and only apply sealant on the inside or at a few points on the inside, resulting in poor sealing. Even if foam sealant is applied on the outside, it may become powdery after a year or a year and a half, resulting in water leaks during the rainy season.

Finally, if the sealant used is of poor quality or becomes old and cracked, it can lead to leakage through the window sill and the wall. The sealant on the exterior walls of old buildings may also become powdery, causing the gap between the window frame and the wall to become larger and water leaks to occur.

Although sealant is only an auxiliary material in the manufacturing process of doors and windows and accounts for a small proportion of the overall cost, it plays a crucial role in the performance of doors and windows, especially in terms of water tightness, air tightness, insulation, and sound insulation. Therefore, the selection of sealant is particularly important for preventing leaks in doors and windows.

What kind of door and window sealant should be used for high-quality doors and windows?

Choose the right product that meets the standard

When choosing a sealant for doors and windows, in addition to paying attention to whether it meets the standard, it is also important to consider the corresponding displacement level. Displacement capacity is the key indicator of sealant elasticity. The higher the displacement capacity, the better the sealant elasticity. When manufacturing and installing doors and windows, sealants with a displacement capacity of not less than 12.5 should be used to ensure long-term air tightness and water tightness of doors and windows.

During the use and installation of doors and windows, the bonding effect of ordinary sealants to cement concrete is usually not as good as the bonding effect to aluminum profiles or glass. Therefore, it is more appropriate to use sealants that meet GB/T 14683-2017 for door and window installation.

High displacement level products have stronger ability to withstand changes in joint displacement, and it is recommended to choose high displacement level products as much as possible.

The Related Standards of Sealant

In the past decade, with the rapid development of building door and window sealant, a large number of updates and compilations have been made to the corresponding product standards in China.

As times keep changing, the development of building doors and windows is also accelerating, and international product standards have been updated and formulated.

Standard Details

Currently, there are several internationally recognized standards related to sealant for doors and windows, including GB/T 14683-2017 “Silicone and Modified Silicone Building Sealants,” ASTM C920-18 “Standard Specification for Elastomeric Joint Sealants,” and EN 15651. Each of these standards provides detailed explanations and regulations for the classification, technical requirements, test methods, and inspection rules of sealant products, and sets corresponding indicators and testing methods for physical and chemical properties of sealants, such as appearance, drying time, mechanical performance, aliphatic plasticizers, etc.

The grading method and requirements of GB/T 14683 reference ISO 11600. GB/T 14683 is classified into levels of 50, 35, 25, and 20 based on displacement capacity. According to ASTM C920, qualified sealants are classified according to type, grade, category, and use as follows: Type S – Single-component sealants, Type M – Multi-component sealants, Grade P – Pourable or self-leveling sealants, Grade NS – Non-sag or gunnable sealants, Grades 100/50, 50, 35, 25, 12.5, Use T, Use NT, Use I, Use M, Use G, Use A, and Use O. The implementation of the EN 15651 standard helps to improve the quality and reliability of building sealant materials, and promote exchanges and trade in the European market. At the same time, this standard also has certain reference significance for manufacturers and users of building sealant materials in other countries and regions.

The products of Homey comply with various international standards. Due to the small deformation of the door and window joints, the displacement capacity of the sealing glue is not highly required. Currently, the door and window sealing glues on the market are mainly 12.5 grade and 20 grade. Of course, products with higher displacement grades have stronger ability to withstand joint displacement changes. When used in door and window joints with larger displacement changes, it is recommended to choose high displacement grade products first.

Therefore, choosing high-quality silicone sealant is essential to ensure the service life of doors and windows and can avoid many unnecessary troubles in the future!

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