The standard rain gutter slope is half of an inch for every 10 feet. This means that your gutter should be a half-inch lower in height at every 10-foot mark until you reach the downspout.

What angle should gutters be installed?

A good rule of thumb for a gutter slope is that you want at least a quarter inch of slope for every 10 feet of gutters.

How do you determine the slope of a gutter?

To get started, measure the side of the house directly under the gutter to determine its length in feet. Multiply the number of feet by 1/16 inch to determine the total slope the gutter requires. For example, if the gutter is 16 feet long, the end near the down spout must be 1 inch lower than the starting end.