Massachusetts Construction Supervisor License (CSL) Practice Test

Which is the proper grading method for the finish grade away from the foundation of a single family dwelling to ensure surface drainage?

1. a 6 inch drop within the first 12 feet

2. a 6 inch drop within the first 10 feet

3. a 7 inch drop within the first 10 feet

4. both B and C

The correct answer is: both B and C

To ensure effective surface drainage away from the foundation of a single-family dwelling, it is crucial that the grading directs water away from the foundation to prevent moisture issues and potential damage. Both the options suggesting a drop of 6 inches within the first 10 feet and a drop of 7 inches within the same distance are appropriate for creating sufficient slope. The recommended grading generally suggests a minimum of a 6-inch drop within the first 10 feet from the foundation to promote drainage effectively. This approach helps ensure that any rainwater or surface runoff does not pool around the foundation, which can lead to long-term structural problems. Additionally, a 7-inch drop within 10 feet provides an even more effective slope, facilitating better drainage than the minimum requirement. This increase in the slope distance can help in scenarios where the soil type or landscaping features might retain water. Thus, both proposed options in the answer contribute to proper grading methods that facilitate surface drainage, making them suitable choices.