• Look out for areas where rainwater might collect, such as patios or driveways adjacent to your house. These paved areas should always gently slope away from the building so that water is not directed towards the foundation. Since materials like concrete and asphalt do not effectively absorb water, pooling can be substantial. So be sure to caulk along all seams between your foundation and adjacent paved surfaces.
  
  
• See our Drainage article for more information on preventing flooding around your home's exterior.

Damp basements can also result from condensation problems. These are usually related to hot weather conditions, so it's unlikely that you will encounter this sort of situation in San Francisco. However, if condensation is the cause of your basement dampness, look for sources of moisture, such as unventilated showers or leaky hot water pipes and dryer vents. You can usually remedy the problem with simple repairs or the installation of exhaust fans to increase air circulation.

Whatever the cause, it's best to approach your wet basement problem by first making your own assessment of the trouble. Try to determine where the water or moisture is coming from and what manageable improvements you might immediately undertake on your own. Next, call in an inspector who has experience with wet basement conditions. Do not rely on a specialist who might be trying to sell you a sump pump, but find an objective, qualified professional who can identify the solutions best suited to your situation and to your budget.