Engineered I-joists must be exposed to fire to degrade. True or false?

Engineered I-joists must be exposed to fire to degrade. True or false?

• A. True
• B. False
• C. Cannot determine
• D. Not sure

Answer: (B)

Engineered I-joists can lose strength from many causes, not just fire exposure. While fire is a major risk that can rapidly weaken them by heating the wood and breaking down the adhesives, they can also degrade due to moisture intrusion, rot, fungal growth, termite damage, or improper installation and loading. So statements like “they must be exposed to fire to degrade” aren’t correct—their degradation isn’t limited to fire. Proper moisture control, protection in concealed spaces, and adherence to installation and load guidelines help prevent degradation under normal conditions, with fire risk addressed by appropriate fire-protective assemblies.

Engineered I-joists can lose strength from many causes, not just fire exposure. While fire is a major risk that can rapidly weaken them by heating the wood and breaking down the adhesives, they can also degrade due to moisture intrusion, rot, fungal growth, termite damage, or improper installation and loading. So statements like “they must be exposed to fire to degrade” aren’t correct—their degradation isn’t limited to fire. Proper moisture control, protection in concealed spaces, and adherence to installation and load guidelines help prevent degradation under normal conditions, with fire risk addressed by appropriate fire-protective assemblies.