What is the maximum height above grade of a wooden deck that a CR-21 Licensee may build?

What is the maximum height above grade of a wooden deck that a CR-21 Licensee may build?

• A. 48 Inches
• B. 18 Inches
• C. 29 Inches
• D. 36 Inches

Answer: (C)

Guardrails come into play when a deck sits 30 inches or more above grade. To stay within a no-guard-rail scenario, the deck surface must be just under that threshold. So the maximum height above grade without needing guardrails is about 30 inches, commonly considered 29 inches. If you go higher, guardrails and their required specifications must be added. The other heights either exceed the threshold (which would trigger guardrails) or are well below it, so they aren’t the maximum you can build without adding guards.

Guardrails come into play when a deck sits 30 inches or more above grade. To stay within a no-guard-rail scenario, the deck surface must be just under that threshold. So the maximum height above grade without needing guardrails is about 30 inches, commonly considered 29 inches. If you go higher, guardrails and their required specifications must be added. The other heights either exceed the threshold (which would trigger guardrails) or are well below it, so they aren’t the maximum you can build without adding guards.