One good way to investigate dampness is by walking around the home during a rain storm. Check the following:
- Gutters should be clear and drain properly. Overflowing gutters are a common problem.
- Downspouts should not flood water next to the house. Add an extension (leader) to discharge the water well away from the home.
- Downspouts that discharge below grade should be checked very carefully. Make sure water is not leaking into the soil or backing up into the basement through the floor drain. In some cases it is prudent to disconnect downspouts that discharge below grade and redirect the water away from the house instead. Ask a Pillar To Post inspector for advice on this.
- Land around the house should shed water away from the house for at least six feet.