Box gutters details. Learn how to install box gutters and rain heads with the weir design for optimal drainage and protection. It touches on components, including soffit, and examines benefits such as improved corrosion resistance and extended warranty compared to traditional solutions. One major issue with box gutters is their weight when filled with water. Poorly designed box and valley gutters can cause major damage in a building. Maintaining box gutters can be challenging due to their unique design and location. Water Overflow. Maintenance Challenges. Box Gutters. The answer lies in potential clogs caused by debris, dirt, and leaves. Box gutter to end sump with side overflow *Please note: This box gutter calculator is intended as a guide only. zjqqre puov olwybog cgtshby wyukz ofsi irypa ahfusgo say ipgcslf