Sources of Water Penetration

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Surface Water
Water or excessive moisture in the crawlspace or basement primarily results from improperly controlled surface water from rain or snow entering through or below the foundation wall.  

Ground Water
A less frequent culprit of moisture penetration is when the groundwater in the soil (water table) rises to or above the crawlspace floor or basement slab. 

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Crawlspaces     Basements    Dealing with  Water Penetration    Controlling Surface Water
Gutters and Downspouts    Surface Grading    Exterior Perimeter Drain    Interior Perimeter Drain   Drain Tile
Trenches and Sump Pump    Vapor Barrier and Vents