one might assume that external walls are at less risk of water leakage than roofs. This is not true, as several other factors contribute to water penetration into walls: wind-driven rain, cumulative weight of water droplets and wear & tear over time.
Like other forms of water leakages, penetration via the external wall is usually only noticed after substantial damage has occurred. As such, we recommend that you engage our ProSeal professionals to conduct a non-obligation evaluation for your external walls when there are signs of water seepages.