What minimum slope is required for the building drain?

The correct minimum slope required for a building drain is 1/4 inch per foot. This standard is vital to ensure proper drainage and prevent issues such as clogs or backups. The slope ensures that wastewater flows efficiently through the drains by utilizing gravity, minimizing the chances of sediment accumulation or slow drainage.

When the slope is too shallow, there is a risk of solids settling out of the wastewater, which can lead to blockages and require more frequent maintenance. Conversely, a steeper slope could result in too much velocity, causing wastewater to run too fast for solids to be carried along, leading to potential air pockets and hindering effective drainage. Therefore, establishing a minimum of 1/4 inch per foot strikes an appropriate balance, promoting optimal flow while reducing maintenance issues.