In conventional light-frame construction on soil with a load bearing value of 2,000 psf for a one-story building with 8-inch hollow concrete masonry walls, what is the minimum thickness of the spread footing?

In conventional light-frame construction on soil with a load bearing value of 2,000 psf for a one-story building with 8-inch hollow concrete masonry walls, what is the minimum thickness of the spread footing?

• A. 4 inches
• B. 6 inches
• C. 8 inches
• D. 10 inches

Answer: (B)

The minimum thickness of a spread footing is critical in ensuring that it can adequately support the load of the structure while also distributing that load adequately across the underlying soil. The design must consider factors such as the bearing capacity of the soil, the weight of the building, and the dimensions of the masonry walls. In this case, given the soil has a load-bearing capacity of 2,000 psf and the structure consists of 8-inch hollow concrete masonry walls, a footing thickness of 6 inches is often considered the minimum to ensure structural integrity. This thickness allows for proper load distribution, minimizes the risk of cracking or settling, and provides enough volume to accommodate any reinforcement that may be required. Choosing a thickness such as 4 inches may not provide sufficient stability, especially under the specified load conditions. Thicker footings, such as 8 or 10 inches, while potentially providing additional safety, may not always be necessary for this specific load-bearing scenario. The selected thickness of 6 inches strikes a balance between structural performance and material efficiency.

The minimum thickness of a spread footing is critical in ensuring that it can adequately support the load of the structure while also distributing that load adequately across the underlying soil. The design must consider factors such as the bearing capacity of the soil, the weight of the building, and the dimensions of the masonry walls.

In this case, given the soil has a load-bearing capacity of 2,000 psf and the structure consists of 8-inch hollow concrete masonry walls, a footing thickness of 6 inches is often considered the minimum to ensure structural integrity. This thickness allows for proper load distribution, minimizes the risk of cracking or settling, and provides enough volume to accommodate any reinforcement that may be required.

Choosing a thickness such as 4 inches may not provide sufficient stability, especially under the specified load conditions. Thicker footings, such as 8 or 10 inches, while potentially providing additional safety, may not always be necessary for this specific load-bearing scenario. The selected thickness of 6 inches strikes a balance between structural performance and material efficiency.