A dam board is used to block or divert the flow of a sewer or drain line. Dam boards are either made from natural materials, such as a wooden plank -- hence the name dam board -- or can be made of synthetic materials. In trenchless construction, dam boards are utilized during pipeline repair or rehabilitation projects.
The dam board serves the same function as a sewer plug as it blocks a line to prevent the flow of water or other product within the line. Used during trenchless construction, it prevents water from an existing line to flow into a section undergoing rehabilitation or installation. Dam boards can be placed across a sewer or drain downstream from new construction areas to direct flow. Dam boards are removed once the work is completed.
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