According to the IRC, what is the minimum slope for rain gutters?

The minimum slope for rain gutters is specified in the International Residential Code (IRC) to ensure proper drainage and prevent water from pooling or overflowing. A slope of 1/4 inch per 10 feet is the standard requirement, which allows for adequate drainage and helps to effectively direct water towards the downspouts.

This slope minimizes the risk of water stagnation within the gutters, which can lead to debris buildup and potential damage to the gutter system or the home’s structure. Properly sloped gutters enhance their efficiency and longevity, ensuring that rainwater is efficiently channeled away from the roof and foundation.

Having a slope that is steeper than necessary, although beneficial to some extent, may not be required, and a flatter slope can lead to inadequate drainage. Therefore, 1/4 inch per 10 feet strikes a balance that meets the IRC's standards for efficient and practical rainwater management.