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Box gutter

- a rainwater gutter, square or rectangular in section which is set into the wallhead. Where the outer face is visible it is often profiled eg an ogee gutter. Box gutters are a frequent source of water penetration. In addition to failure of the material in which they are formed, usually lead or cast iron, if the outlets become blocked, they can cause water to flood back into the building, so a safety overflow arrangement is essential.