Where is the best location to install a built-in gutter to avoid interior leakage in case of gutter failure?

Installing a built-in gutter at the eave is the most effective location to mitigate the risk of interior leakage in the event of gutter failure. The eave is the edge of the roof that overhangs the walls of the house, which is crucial for directing water runoff away from the roof and foundation. By placing the gutter here, it can efficiently collect rainwater that drips off the roof and channel it away from the structure.

The positioning of gutters at the eave also allows them to capture water from the entire roof surface above, providing a more comprehensive drainage solution. If a gutter were to fail at this location, the risk of water pooling or spilling over into the building’s interior is significantly reduced, as the water would still be directed away from the walls and foundations.

Other locations, such as the peak or ridge, would not provide the necessary drainage, as they are typically higher than the eave and don't effectively capture runoff. Similarly, placing gutters at the valley may not offer sufficient protection because valleys are often prone to collecting snow and debris, making them susceptible to clogging and water backup. Thus, the eave is the ideal choice for built-in gutters to prevent interior leaks and ensure effective management of roof runoff.