The ends of an abandoned sewer pipe may be capped with a brick wall at least ___ thick with cement mortar joints.

The ends of an abandoned sewer pipe may be capped with a brick wall at least ___ thick with cement mortar joints.

• A. 4 inches
• B. 6 inches
• C. 8 inches
• D. 12 inches

Answer: (C)

Closing an abandoned sewer pipe requires a sturdy, load‑bearing cap to resist earth pressure, prevent infiltration and pests, and avoid movement or settlement. A brick masonry wall eight inches thick, laid with cement mortar joints, provides the necessary strength and a durable seal. Four or six inches wouldn’t withstand typical backfill loads and could crack or settle, creating gaps for water, gas, or pests. A twelve-inch wall is generally more than needed and adds unnecessary weight and cost. The cement mortar joints ensure a tight, bonded closure that remains continuous with surrounding masonry.

Closing an abandoned sewer pipe requires a sturdy, load‑bearing cap to resist earth pressure, prevent infiltration and pests, and avoid movement or settlement. A brick masonry wall eight inches thick, laid with cement mortar joints, provides the necessary strength and a durable seal. Four or six inches wouldn’t withstand typical backfill loads and could crack or settle, creating gaps for water, gas, or pests. A twelve-inch wall is generally more than needed and adds unnecessary weight and cost. The cement mortar joints ensure a tight, bonded closure that remains continuous with surrounding masonry.