Detaling Basics – Capillary Action

architectural graphics, detailling

Capillary action is where the surface tension of the water can pull the water into small gaps. Any gaps in your building that are less than 5mm (1/4″) could allow water into your building. Capillary action is extremely powerful, and can even overcome gravity, allowing water to creep up a detail and into your building. The good news is that it’s extremely easy to solve. All you need is a gap that is wider than 5 mm (1/4″). If you look at good detailing you will notice that there are often gaps at the bottom of flashings that will prevent water from creeping up the detail.

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