What is the minimum clearance required between the ground and siding?

• A. 100 mm
• B. 200 mm
• C. 400 mm
• D. 600 mm

Answer: (B)

Maintaining a gap between the siding and the ground protects the siding from moisture, rot, and pests. With this clearance, rain splash and soil moisture are less likely to reach the bottom edge, and there’s room for ventilation and inspection of the siding’s base. About 200 mm (around 8 inches) is the commonly recommended minimum because it provides enough separation to prevent moisture problems while keeping maintenance practical. A smaller gap can allow moisture and pests to affect the siding, while much larger gaps aren’t usually necessary unless site conditions require them.