Which condition indicates that concrete has spalled due to heat?

Which condition indicates that concrete has spalled due to heat?

• A. Concrete that has spalled due to heat
• B. Cracked drywall
• C. Water-stained ceilings
• D. Sagging roof trusses

Answer: (A)

Spalling happens when concrete is heated and the surface flakes or pops off. Heat drives moisture inside the concrete into steam, creating internal pressure that breaks away the outer layer. Seeing concrete that has spalled is direct evidence that the concrete itself has been exposed to heat. Other signs point to different problems: cracked drywall comes from framing or finishing issues, water-stained ceilings come from moisture intrusion, and sagging roof trusses indicate structural load problems. So the clear sign of heat-related spalling is concrete that has spalled.

Spalling happens when concrete is heated and the surface flakes or pops off. Heat drives moisture inside the concrete into steam, creating internal pressure that breaks away the outer layer. Seeing concrete that has spalled is direct evidence that the concrete itself has been exposed to heat. Other signs point to different problems: cracked drywall comes from framing or finishing issues, water-stained ceilings come from moisture intrusion, and sagging roof trusses indicate structural load problems. So the clear sign of heat-related spalling is concrete that has spalled.