Water seeks its own level…and its the lowest level. It also runs downhill especially on sloped roofs due to gravity. So you might find it surprising how many times we encounter homes while inspecting them that have windows or skylights at the base of roof slopes (see above pictures) as if to challenge the water by saying “I dare you to come inside”.
Of course, in winter any built-up snow resting against the walls of a warm home, chimney and its windows will cause a recurring freeze-thaw cycle, to occur. This makes water penetration via the window or under the roof shingles a formidable opponent. Even without windows present at the bottom of a roof slope, just having walls at their base means special precautions are needed, including flashings and ice & water shield.
Water is one of the biggies in the world of building science. We always want to prevent its migration into the home by planning a proper evacuation route for it, as water has to go somewhere eventually.
If you are concerned about water migration into a home or already have water leaks you’ll need to act fast to minimize the amount of damage it can cause, including the potential for mould growth.
Buying a home or making repairs to one? Protect yourself…get it inspected!