What is the minimum interior strip footing width?

What is the minimum interior strip footing width?

• A. 200 mm
• B. 250 mm
• C. 150 mm
• D. 180 mm

Answer: (A)

The width of an interior strip footing is driven by the need to provide a solid bearing area to spread the wall load into the soil and to accommodate the concrete and any required reinforcement. In typical residential practice, 200 mm is the smallest width that reliably meets code and supports standard loads from interior walls. Using widths smaller than this (like 150 mm or 180 mm) would reduce bearing area and may not meet structural requirements, increasing the risk of settlement or cracking. A wider width (such as 250 mm) would still work, but it’s not the minimum needed for normal conditions and would add unnecessary cost. Therefore, 200 mm is the minimum interior strip footing width.

The width of an interior strip footing is driven by the need to provide a solid bearing area to spread the wall load into the soil and to accommodate the concrete and any required reinforcement. In typical residential practice, 200 mm is the smallest width that reliably meets code and supports standard loads from interior walls. Using widths smaller than this (like 150 mm or 180 mm) would reduce bearing area and may not meet structural requirements, increasing the risk of settlement or cracking. A wider width (such as 250 mm) would still work, but it’s not the minimum needed for normal conditions and would add unnecessary cost. Therefore, 200 mm is the minimum interior strip footing width.