Watch where the water goes during a rain storm, or spring melt. If water drains from the street or other areas, towards your house, consider landscaping features which can guide the water away. Occuring frequently throughout the year. Persistant leakage will almost always leave noticeable signs and clues, whether the basement is finished or not. Generally occuring only at time of peak rainfall or other surface run-off, usually in the spring or fall.
Seasonal leakage is more difficult to identify unless the leak is actively occuring.
Occuring only when very specific conditions exist. This type of leak may occur once in the life of the basement, or may occur every few years when the appropriate conditions exist. Gil Strachan represents Electrospec Home Inspection Services, specializing in pre-purchase inspection of resale residential properties. Visit our Web Guide to find links to related sites. Home Reference Book by Carson Dunlop 1999-2000.