Oregon Construction Contractors (CCB) Practice Test

How does concrete used in foundations affect water drainage?

1. It absorbs water

2. It acts like a repellent and sheds water away

3. It cannot affect water drainage

4. It retains water

The correct answer is: It acts like a repellent and sheds water away

Concrete used in foundations is designed to be a solid barrier that doesn't allow water to pass through it easily. This characteristic enables concrete to effectively act like a repellent, directing water away from the foundation area. When rainfall occurs or when water accumulates in the soil, the concrete surface helps to shed the water away rather than allowing it to permeate into the soil, which could lead to issues such as excessive moisture within the foundation or even structural damage over time. This property of concrete is crucial in preventing water from pooling around the foundation, as standing water can promote erosion, soil settling, and potential flooding in basements or crawl spaces. Thus, the use of concrete in foundations plays an essential role in managing water drainage and protecting the integrity of the structure.