What is the minimum ground clearance for siding?

• A. 200 mm
• B. 400 mm
• C. 600 mm
• D. 800 mm

Answer: (A)

Keeping siding a clear distance above the ground protects the material from moisture and pests, and makes it easier for the area to dry, drain, and be inspected. The bottom edge should sit above finished grade by a margin that accounts for splash from rain, landscaping materials like mulch, soil settlement, and small grade changes over time. A minimum of 200 mm provides a solid buffer to prevent water wicking, rot, and termite access, while still keeping flashing and ventilation effective. Lower clearances risk moisture intrusion and pest problems, while much larger gaps add unnecessary cost and potential drainage issues. In most standard guidelines, 200 mm is the recommended minimum, though always follow your local code or the siding manufacturer’s installation instructions if they specify a different value.