What is the minimum depth for the support beam under a lintel?

What is the minimum depth for the support beam under a lintel?

• A. 6 in
• B. 10 in
• C. 8 in
• D. 12 in

Answer: (C)

The main idea is that the load from above must be carried safely through the lintel to a solid support below, so the supporting beam under the lintel must be deep enough to provide adequate strength and bearing. Eight inches is the minimum depth because it gives enough cross‑sectional area to resist the bending and transfer the load from the lintel into the supporting structure without excessive deflection. A shallower depth, like six inches, wouldn’t provide sufficient bearing area or stiffness, increasing the risk of cracking or settlement. Deeper options (ten or twelve inches) exceed the minimum and are only used if specific loads or conditions require them, but they’re not needed to meet the minimum requirement.

The main idea is that the load from above must be carried safely through the lintel to a solid support below, so the supporting beam under the lintel must be deep enough to provide adequate strength and bearing.

Eight inches is the minimum depth because it gives enough cross‑sectional area to resist the bending and transfer the load from the lintel into the supporting structure without excessive deflection. A shallower depth, like six inches, wouldn’t provide sufficient bearing area or stiffness, increasing the risk of cracking or settlement. Deeper options (ten or twelve inches) exceed the minimum and are only used if specific loads or conditions require them, but they’re not needed to meet the minimum requirement.