The cracking of weatherproof door and window sealant is a very headache. After cracking, it will cause curtain wall water leakage, and even lead to a series of problems such as mold on the inner wall. The follow-up treatment is very troublesome. Although weatherproof glue belongs to the auxiliary material in the cost of curtain wall, but the role can not be underestimated! If you want the curtain wall to be watertight for a long time, for this small auxiliary material is really not sloppy! So how can we prevent the curtain wall from cracking? We think there are three things to keep in mind: design, material selection and construction! Please refer to the specific introduction of door and window sealant manufacturers!

one design

a) Width

Design refers to the design of the glue joint, including the width of the glue joint, the thickness and the displacement capacity of the weather glue.

The design of curtain wall joint width, in addition to considering the aesthetic, prevent plate hard contact and other aspects, should also consider the size of the joint deformation proportion and weather resistance of the displacement capacity of rubber.

The function of weatherproof glue is to meet the deformation of curtain wall joints, which. The important technical index is the "displacement capacity", that is, the ability of weather-resistant glue to withstand the change of joint width, generally expressed by the classification method, such as 25, 35, 50, +100/-50, 25 means that weather-resistant glue can withstand the width of the glue between + 25%.

If the joint deformation proportion of curtain wall is large, and the displacement capacity of the selected weather-resistant adhesive is not enough, there may be cracking of weather-resistant adhesive. The width design of curtain wall joint can refer to JGJ

102 The formula recommended in Article 4.3.9 of Technical Specifications for Glass Curtain Wall Engineering shall be calculated.

In addition, the width of the rubber seam should not be less than 6mm.

In the actual construction process of curtain wall, we often encounter some joint width is less than the design width, which is mainly due to the size deviation of material processing or installation deviation. This narrow glue joint is prone to water leakage, because the proportion of joint deformation increases (.. Deformation does not change, the actual joint narrower), the original design of the suitable weather adhesive can not meet the greater deformation.

If conditions permit, weather resistant adhesive with higher displacement capacity is selected, which can effectively reduce the probability of water leakage of curtain wall and prolong the service life of weather resistant adhesive, because the actual deformation of weather resistant adhesive does not reach the limit value of the product itself. Although the initial investment has increased some, but the proportion is really small, but the cost of curtain wall maintenance in the later stage has been greatly reduced!

b) Depth

In addition to the width of the glue seam, the depth is also very important. Because the aging of weather resistant glue usually develops from the surface to the deep, if the glue seam is too thin, it may crack prematurely

For the depth of weather resistant glue, our recommendations are as follows:

a. The depth of weatherproof glue should be greater than 6mm;

b. The depth of weatherproof glue should not be greater than the width;

c. Fill concrete, masonry or stone joints. When the seam width is less than 13mm, the depth of weatherproof glue should be the same size; when the seam width is 13-25mm, the depth should be half of the width;

d. For the joints of non-porous materials such as metal and glass, when the seam width is 6.0~13.0mm, the depth of weatherproof adhesive should not be less than 6.0mm; When the seam is wider than 13.0mm, the depth of weatherproof glue should be 6.0~13.0mm.

two Material selection

Design a reasonable glue seam, the next is to choose glue. The selection of glue mainly looks at two aspects: one is the displacement capacity of the selected weather adhesive can meet the design requirements, which can be seen from the product packaging; The second is to see whether the selected weather adhesive can reach its nominal displacement capacity, there is no shoddy, which will be sent to the third party testing institutions to test, but for the products with significantly lower prices, we can also use the method we recommended yesterday to identify whether there is oil filled.

In addition, for the stone curtain wall, we must choose special stone sealant or anti-pollution and weatherproof sealant to prevent the pollution caused by the glue to the stone.

Three. construction

After the reasonable design of glue joints and the selection of appropriate weather resistant glue, of course, we should do a good job of construction. Sealant for building, in fact, is a "semi-finished product", only let it in the right position, form the right shape (width, thickness) and appearance, good curing, solid bond to the substrate, it can. Finally play its due role. And these depend on the construction process to achieve! The quality of the construction process directly affects. Whether the final curtain wall leaks!

In order to perfect adhesive and actual engineering materials can stick well, before large-scale construction should be carried out adhesion test to ensure that weather resistant adhesive and material adhesion is good.

In the construction process, there should also be quality control measures, regular field hand stripping bonding test for the cured sealant, check the appearance, curing and bonding of the glue, and ensure the quality of construction.

The above information is provided by Omann door and window sealant manufacturer! Auman manufacturers are committed to establish a stable product market and open up new sales channels, strict sales management, brand services, to provide customers with the best pre-sale, sale, after-sales service, received around the market recognition.