The roof is one area highly susceptible to moisture intrusion and can happen in a number of ways. The roof should have the correct amount of slope. The roof's flashings can also start to leak so they should be checked periodically. Gutters and downspouts can become an issue if they are clogged which will prevent water from draining adequately. They should also be positioned to drain well away from the house.
The plumbing system is another high-risk area for water intrusion and should be checked to make sure there are no dripping pipes, leaking fixtures, or blocked drains.
Most houses over time will start to develop cracks and holes in the walls and foundations that can then be susceptible to moisture intrusion. If you notice this happening, try to seal them up as soon as possible.
A high level of humidity in a home can cause numerous moisture-related problems. Among these are musty smelling odors, staining on walls and ceilings, and bad indoor air quality. The best way to prevent this is to clean and dry thoroughly any surfaces where you see moisture collecting.
These are just a few of the many areas throughout the home that are at risk of damage due to water intrusion. Keeping the home well maintained and taking quick action to fix any issues you find are good ways to avoid bigger problems and higher repair bills.