How much should metal gutters slope minimum per length?

The correct answer reflects the recommended slope for metal gutters for proper drainage. Gutters should slope at least 1 inch for every 16 feet of run to ensure that water flows toward the downspouts effectively. This slope is critical as it helps prevent water from pooling in the gutters, which can lead to a host of problems such as rust, leaks, and even damage to the roof and fascia.

This specific measurement of slope is derived from best practices in drainage system design. A gradual slope allows for consistent water flow while minimizing the risk of debris accumulation that can impede drainage. Using a slope of 1 inch in every 16 feet ensures a balance between effective drainage and practical installation, keeping in mind the aesthetic appearance of the gutter system.

The other options present variations of slope that do not align with the standard recommendations for gutter installations, which can result in inadequate drainage and potential issues over time.