Timber deck areas exposed to drainage are to be inspected for which condition?

Timber deck areas exposed to drainage are to be inspected for which condition?

• A. Fungal growth
• B. Decay
• C. Insect damage
• D. Cracking from drying

Answer: (B)

Moisture from drainage keeps timber damp, which invites fungi to attack the wood. The main concern is decay—the internal breakdown of wood by fungi that weakens strength and can compromise deck support. When inspecting, look for signs of decay such as soft or crumbly areas, discoloration, hollow sounds when tapped, or rot pockets. Surface fungal growth can appear with moisture, but it doesn’t always indicate the same level of structural loss that decay does. Insect damage and cracking from drying can happen too, but the question focuses on the condition driven by prolonged moisture exposure, which is decay.

Moisture from drainage keeps timber damp, which invites fungi to attack the wood. The main concern is decay—the internal breakdown of wood by fungi that weakens strength and can compromise deck support. When inspecting, look for signs of decay such as soft or crumbly areas, discoloration, hollow sounds when tapped, or rot pockets. Surface fungal growth can appear with moisture, but it doesn’t always indicate the same level of structural loss that decay does. Insect damage and cracking from drying can happen too, but the question focuses on the condition driven by prolonged moisture exposure, which is decay.