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What is the minimum slope for ground adjacent to the foundation?

  1. 1:5

  2. 1:10

  3. 1:15

  4. 1:20

The correct answer is: 1:10

The minimum slope for ground adjacent to the foundation is essential for ensuring proper drainage away from the structure. A slope of 1:10 means that for every 10 horizontal units, the ground should drop 1 vertical unit. This slope is generally recommended to prevent water from pooling around the foundation, which can lead to moisture intrusion and structural issues over time. Having an adequate slope promotes effective drainage, directing rainwater away from the foundation and reducing the risk of flooding and erosion. Sufficient grading is crucial for maintaining the integrity of the foundation and preventing costly repairs. A steeper gradient, such as a 1:5 slope, may be unnecessary and could create an unstable condition, while a gentler slope like 1:15 or 1:20 does not effectively facilitate drainage as required. Therefore, the 1:10 slope is the best standard to ensure water moves away from the foundation efficiently.