General Contractor Practice Exam

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How far above the ground water table do you waterproof a foundation wall?

10 inches
12 inches
14 inches
16 inches

The correct answer is: 12 inches

Waterproofing a foundation wall should be done at a height of 12 inches above the ground water table. This standard is based on the principle of preventing moisture from entering the foundation and, subsequently, the structure it supports. The 12-inch height serves as a safeguard, helping to ensure that any water pooling around the foundation does not seep into the wall and compromise the integrity of the building. By waterproofing at this level, you effectively reduce the risk of water infiltration, which can lead to mold growth, structural damage, and deterioration of foundation materials over time. The distance is significant because ground water levels can fluctuate due to rainfall, soil saturation, and seasonal changes. By setting the waterproofing barrier at a full foot above the anticipated ground water level, it accounts for potential increases in water levels that can occur due to these factors. This standard practice highlights the importance of moisture control in construction and ensures that the foundation remains dry and stable throughout its lifespan.