The minimum slope for gutters, also known as the gutter pitch, is generally recommended to be ¼ inch per 10 feet of gutter run. This slope allows for proper water flow towards the downspouts and helps prevent water pooling or overflowing.
Here's an example to illustrate the minimum slope: For every 10 feet of gutter length, the height of the gutter should drop by ¼ inch. So, if you have a 40-foot long gutter, the height difference between the starting and ending points should be 1 inch.
It's important to note that the recommended minimum slope can vary depending on the specific circumstances, such as the climate, the amount of rainfall in your area, and the type of gutter system you have. In areas with heavy rainfall, a steeper slope may be necessary to ensure adequate water drainage.
When installing or adjusting gutters, it's best to consult local building codes and guidelines, as they may specify specific requirements for your area. Additionally, professional gutter installers or contractors can provide expert advice on the appropriate slope for your specific situation.