How to solve the bulging & blistering of curtain wall sealants?

How to solve the bulging and blistering of the weather-resistant silicone sealant on the curtain wall joints?

One feature

The "foaming" phenomenon is different from "drumming", which is manifested as a hollow hemispherical bulge with dot-like spacers, which mostly occurs in sunny days after rain and dew and high temperature in summer; curtain walls made of aluminum plates, glass, stone, etc. appear.

Two reasons

① There is water vapor in the joint, which may come from rain and dew, foam stick or damp base surface.

②The foam rod is more damaged, and the air escapes when it is heated and the plate is squeezed, resulting in foaming.

③The glue is not full and filled with air bubbles.

④The temperature of the base material surface is too high under the sun exposure, and the by-products of sealant curing gather and lead to foam (alcohol-type adhesive is more serious).

Three improvement measures

①Before applying glue, make sure that the base surface is dry and the filling material is dry and complete.

② Avoid construction when the base surface temperature exceeds 45°C.

The above is about the reasons for the swelling and foaming of the weather-resistant sealant on the curtain wall joints and the improvement measures. In order to ensure the aesthetic feeling of the sealant construction, it is necessary to choose a suitable weather strip construction and do a good job of protection!

How to solve the bulging and blistering of the weather-resistant silicone sealant on the curtain wall joints?

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