What is the minimum lap or rabbeted horizontal wood siding required?

The minimum lap or rabbeted horizontal wood siding required is half an inch. This measurement is important because it ensures that there is sufficient overlap between the boards. This overlap is crucial for preventing water infiltration, which can lead to issues such as rot or mold. A smaller gap than half an inch may not provide adequate protection against the elements, while a larger gap is unnecessary and may increase material costs and labor without offering any significant benefits. By adhering to the minimum requirement of half an inch, builders can achieve an effective balance between performance and efficiency in construction practices.