What is the effect of back-pressure in plumbing systems?

Back-pressure in plumbing systems refers to a condition where the pressure in the drainage system rises above the atmospheric pressure, often due to factors such as blockages or improper venting. This increase in pressure can disturb the water seals in plumbing traps, which are designed to prevent sewer gases from entering the living space. When back-pressure occurs, it can force water out of these traps, leading to a loss of the water barrier.

As a result, sewer gases may escape into the building, creating health hazards and unpleasant odors. The integrity of the plumbing system is compromised when trap seals are lost, indicating the critical importance of maintaining proper pressure balance in plumbing to ensure both function and safety. Managing back-pressure through proper design and venting is essential to protect against such issues.