5.1. Conditions for Decay

• Moisture content above 20%

Wood is a natural material that contains moisture. When the moisture content in wood exceeds 20%, it becomes more vulnerable to decay. High moisture provides an ideal environment for fungi and bacteria to thrive, which can lead to the breakdown of the wood structure. Dry wood, on the other hand, is more resistant to decay because it lacks the necessary moisture that pathogens need to grow.

Think of wood as a sponge. When a sponge is wet, it can easily develop mold and rot, similar to how wood can decay when it has too much moisture. Conversely, a dry sponge does not mold because there is no water for mold to grow on.

• Warm temperatures (20–35°C)

The temperature range of 20 to 35 degrees Celsius is ideal for decay processes. Within this temperature band, biological agents like fungi and bacteria are most active. They thrive and reproduce faster when exposed to warm temperatures, accelerating the decay process. In contrast, cooler temperatures can slow down or halt decay, making it less of a threat to wood.

Consider how food spoils faster in warm weather. Just like food, wood too is more susceptible to biological decay at warmer temperatures. Just as we put food in the fridge to slow down spoilage, maintaining lower temperatures can help preserve wood.

• Lack of sunlight

Sunlight has a natural drying effect, which can help reduce moisture levels in wood. When wood is kept in shaded or dark areas without exposure to sunlight, it retains more moisture, creating a conducive environment for decay. Sustained moisture with lack of light promotes the growth of decay-causing organisms, leading to damage.

Imagine a damp towel that you leave in a dark closet. It stays wet longer than if you hung it out in the sun. Similarly, wood kept in shaded, dark environments is more likely to remain moist and rot, much like the towel.

• Poor ventilation

Ventilation is crucial for allowing moisture to escape from wood products. Poor ventilation traps humidity and moisture around the wood, which fosters the growth of fungi and decay organisms. By increasing air circulation, the moisture can evaporate more efficiently, reducing the risk of decay.

Think about how a room that is not aired out can get stuffy and musty. Just like that, if wood is placed in an enclosed, poorly ventilated space, moisture can build up and cause decay, much like how stale air can lead to an unpleasant environment.

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