Which zone's bedding rule requires placement of bedding material and leaving it in a loose condition below the middle third of the outside diameter of the pipe?

• A. Cover Zone
• B. Top Zone
• C. Bedding Zone
• D. Lowest Zone

Answer: (C)

The main idea here is how the pipe rests on a prepared bed. The bedding zone is the bottom layer of material under the pipe that is left loose, specifically only up to the middle third of the pipe’s outside diameter. Keeping this bedding loose in that portion creates a cushioning layer that allows the pipe to seat evenly and accommodates minor variations or settlement without creating high, localized pressures that could damage the pipe or joints. This controlled looseness helps the pipe find a stable, level position as it’s laid and settles, rather than being forced into a rigid, overly compacted bed. The other zones refer to different parts of the trench system (above the pipe or not standard terms) and don’t describe this bottom-bed preparation.